Norberto's H8-Z80-64-V2.2 PCB

[ShadowTron Blog]

I'm looking for a "H8-Z80-64-V2.2" blank PCB. Hoping someone has one? 

Note that I've posted a series of video's on my build of the "H8 8080A 64K RAM BRD" board should anyone be bored enough to watch me solder.

https://www.youtube.com/watch?v=xpvd9NF3iq0

-Neil

[Norberto Collado]

Great videos and enjoyed watching them. Thank you! 

 

Norberto

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[David Troendle]

Hi Neil,

If you don't find any, ordering them is real easy.  At the end of this email I give the text for my last reorder of that board.  I also attached the quote I got.

When members do an order, they frequently ask if other want a copy.  That helps spread the setup charge.  By re-ordering from an existing order, you save the engineering costs.

If you do order, you can put me down for 1 to help get your started.

The email is below. The price I got was $82.16 for 5 boards.  You will receive them about 10 days after they receive payment.  Not sure if there are any tariffs or restrictions now.

Good luck.  You videos are great!

David

From: David Troendle

Date: 2017-05-26 01:58

To: Cathy Ma_OurPCB <sal...@ourpcb.com>

Subject: Please quote

Hi Cathy,

Could you get me a quote for 5 copies of rrder number 15122576 (Norby's order number).  I would like the green mask and the lead HAL finish.

Hopefully using the order number will save us time.

(By the way, Norby has posted all his old order numbers.)

David

[ShadowTron Blog]

Thanks, I've already reached out for a quote, it looks like it will be around the same $ as your quote. As I'm looking to assemble one of them I'll be placing an order. Would be great if others are interested. I'll keep an eye on the forum. Worst case is I'll end up with 5 boards and will offer up the rest on the forum.

[ShadowTron Blog]

Thanks. Please spread the word on my videos, that would really help. I've been at it for about 18 months now and have posted nearly 190 videos with several others in production. 

-Neil

[Glenn Roberts]

I believe the most recent rev. of the board is 2.6?  at least that’s what my board is…  so unless there’s a reason to order the older boards…(?)

 

• Glenn

 

 

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/f343e7e1-55d1-4515-9a90-1b4d25632601%40googlegroups.com.

[Glenn Roberts]

Nice video.  What JBC soldering station do you recommend?  I’m not super thrilled with my Weller – pretty crude temp. control…

 

From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of ShadowTron Blog
Sent: Tuesday, August 28, 2018 2:28 PM
To: SEBHC <se...@googlegroups.com>

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[David Troendle]

Page 1 of the assembly guide (available here) describes the board's versioning scheme.  The current board revision is 2.6.  That corresponds to Gerber file revision 32.  These are the files posted on Norby's site.

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/011901d43f15%24d5dbec50%248193c4f0%24%40gmail.com.

[Glenn Roberts]

Awesome instructions!  Great work…

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/f28cd416-41a5-43e4-c1e0-0a6efb38f4c1%40troendle.org.

[ShadowTron Blog]

I've been using a JBC for a few years now. I believe it's an earlier version the CD-1BE with the T245 handle. I also bought an assortment of tips. For me this was a worth while investment. Thermal handling is superb. From turn-on to ready to solder is under 3 seconds. Recovery from sleep is even quicker, from the time I remove it from the stand to touching a solder joint is all the time it needs to get back up to temp. I find the handle well balanced, the working distance from handle to tip is excellent for me. The smaller tips have excellent thermals, it handles ground plains well. With a larger appropriate tip working on soldering heavy ground lugs, wire and solder planes is painless. I've used Wellers and other for years. After over heating and lifting a pad on a PDP-8A CPU card (trying to remove a stubborn 74xx TTL device ) with a Weller I broke down and bought the JBC and have never looked back. Changing tips is super simple, the little catch on the top of the base unit pulls the tips out easily, I slid the handle over a new tip and in less then 3 seconds I'm ready to go. I believe being able to load an appropriate tip very quickly for the solder joint at hand has improved my overall soldering quality and has likely save me from damaging boards.

I'm probably $1000 into the JBC and don't regret it. I've bought a number of specialized tips. Note that I use the station several times a week, some time for hours, part of justifying the cost was the amount of time i use the tool. I'm about to start an assembly for an Apple II Rev 0 clone. I have a bare PCB. I have complete confidence that the JBC will provide excellent results throughout the build which I believe will make troubleshooting easier.

When I was seriously into the N8VEM S-100 stuff I soldered up countless boards with no issues. I've done a fair amount of rework and mods over the last several years again without issue.

I also use a Hakko FR-300 desoldering tool, highly recommended. If you can afford a decent desoldering tool it's also a good investment.

-Neil

[ShadowTron Blog]

It sounds like if I order boards I should do a fresh order with the latest gerbers? Is there a way for me to verify the gerber versions on the existing OURPCB PO?

[Norberto Collado]

I will verify as I renamed the main title and lost all the links to the files.

Norberto

-------- Original Message --------
Subject: Re: [sebhc] Norberto's H8-Z80-64-V2.2 PCB

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[Glenn Roberts]

Thanks Neil.  Sounds like an awesome setup.

 

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[ShadowTron Blog]

I've been emailing with OURPCB and they can update the gerbers on Noberto's original PO. There will be a tooling fee but I should be able to cover it. Per the email the cost is fixed from 1-8 boards so I'll order 8 to of course offer up here on the forum.

Noberto - Do I have your permission to get the gerbers updated? if so where can I get the current set of files?

-Neil

[ShadowTron Blog]

Ok, I'm a little confused here, it sounded like there are newer GERBERs then the V32 ones? It looks like Norberto already as the V32 gerbers attached to the OURPCB PO. Do I need to do anything beyond simply order some boards?

-Neil

[Norby]

There should not be any tooling fees as I paid for it. Please send me the quote to check with them.

Sent from my iPhone

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[Norberto Collado]

Neil,

 

The last time we build out this board was difficult on the jumpers as the holes were too small. Also, you cannot use the H8 25 pin connector as it is using the wrong holes.

 

Let me fix this two issues before ordering the board.

 

Thanks,

Norberto

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/E288740B-F466-489C-A5AD-2565464D6C83%40koyado.com.

[Norberto Collado]

Updated board to V 2.7. Picture attached.

 

Changes:

1.       Fixed +8V power line running under heatsink bracket which eventually will short out burning out diodes on the backplane

2.       Moved capacitors away from heatsink bracket

3.       Increased jumpers holes as it was using the wrong size

4.       Deleted 2 MHZ oscillator and jumpers. Added footprint to use a half or full size can oscillator. Added jumper for internal or external oscillator select.

5.       Increased input power capacitors from 2.2uf to 33uf.

6.       Increased value from 0.01uf to 0.1uf on decouple caps.

7.       Rename 74LS74 to 74HCT74.

8.       Any others changes?

Thanks,

Norberto

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/A1B5FCD2-6EEF-44AA-95D2-868B0B015C42%40koyado.com.

[Glenn Roberts]

is there anything that would help make it easy to use the Pololu step-down buck regulators?  It's been a while, but I think i had to rig something up to get those to fit?  or is it just a matter of putting a three-pin header in where the regulator goes? Also, I know in past cards you've put jumpers in to allow for use with PC-style stepping power supply (essentially shorting the regulator) - but i'm guessing that's no longer needed now that we have the buck regulator solution (which should work with either 5/12 V switching supplies or the classic Heath 8/18V)?

great work and so glad you're taking the time to fix these little bugs in the board.  i have a Rev. 2.6 board that i was planning to build out but it probably makes sense now to wait for the new one!

tx guys!

- Glenn

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/07cf01d44265%242f488940%248dd99bc0%24%40koyado.com.

[Norberto Collado]

Great feedback and  will double check the bulk regulator placement.

 

Also I’m tempting to replace both ROMS (2732) with a single ROM.

 

Norberto

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/CACkv5mA%3DpEaeb6Uv2hc7d1ygiKZEWijtq2MNgNH_67APQKDEcg%40mail.gmail.com.

[George Farris]

If you do that Norberto, maybe you could consider putting the RTC on
board as well. That would be awesome. The other thing would be bank
switched ram.

Cheers
George

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[Norberto Collado]

To add this capabilities, I will need to put together a new schematic for a new board. This board does not have an schematic and it is hard to trace the lines. I did spend the whole day doing that just to add a single ROM.

I added the single ROM and activated the A-A15 and the D0-D7 lines to ensure proper connections and when running the debug checker is complaining that the current traces are too close. So now I will need to rewire such lines as shown in the attached picture to do it right.

Thanks,
Norberto

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[ShadowTron Blog]

I don't have a quote for updating the gerbers; OURPCB asked to have the GERBERS emailed/uploaded so they could provide a quote.

-Neil

[Norberto Collado]

I will send them the Gerbers as I’m making changes.

 

Here is how it looks now!

 

Norberto

 

From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of ShadowTron Blog
Sent: Sunday, September 02, 2018 8:29 PM
To: SEBHC
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

 

I don't have a quote for updating the gerbers; OURPCB asked to have the GERBERS emailed/uploaded so they could provide a quote.

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/110a1e88-2410-41ff-b195-1a8a11a724c1%40googlegroups.com.

[Norberto Collado]

I decided to add the RTC to also provide backup power to the RAM.

Thanks,
Norberto

-----Original Message-----
From: Norberto Collado [mailto:norberto...@koyado.com]
Sent: Sunday, September 02, 2018 6:22 PM
To: 'se...@googlegroups.com'
Subject: RE: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

To add this capabilities, I will need to put together a new schematic for a new board. This board does not have an schematic and it is hard to trace the lines. I did spend the whole day doing that just to add a single ROM.

I added the single ROM and activated the A-A15 and the D0-D7 lines to ensure proper connections and when running the debug checker is complaining that the current traces are too close. So now I will need to rewire such lines as shown in the attached picture to do it right.

Thanks,
Norberto

-----Original Message-----

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[George Farris]

Will there be room to add a 256 or 512MB ram chip and bank switch it so
we can run MP/M and Fuzix or UZI?

Just curious.
George

[Lee Hart]

George Farris wrote:
> Will there be room to add a 256 or 512MB ram chip and bank switch it so
> we can run MP/M and Fuzix or UZI?

That got me curious. I designed a little Z80 system patterned after the
H8 <http://www.sunrise-ev.com/z80.htm>. The CP/M board for it has a
bank-switched 512k RAM and micro-SD card for "disk" storage. We have it
running CP/M now.

What are the hardware requirements to run one of these more advanced OS
like MP/M, Fuzix, or UZI?

--
"Verschlimmbessern" (German, verb) - To make something worse by
trying to improve it. (English translation: "Microsoft"?)
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com

[George Farris]

Hi Lee,

I haven't looked too deeply into it but here are a couple of links.

One a Hackaday article.
https://hackaday.com/2017/04/16/z80-fuzix-is-like-old-fashioned-unix/

https://github.com/EtchedPixels/FUZIX


Looks like UZI will run in 64K, Fuzix require bank switching.

But I'm curious and woul like to get one or both of these running at
some point.

Cheers
George

[Norberto Collado]

The RAM Chip has been there since the first board.  The question is how we drive the A16, A17 and A18 lines? Can someone provide an schematic?

 

Norberto

-------- Original Message --------
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

From: George Farris <farr...@gmail.com>
Date: Mon, September 03, 2018 8:29 pm
To: se...@googlegroups.com

Will there be room to add a 256 or 512MB ram chip and bank switch it so
we can run MP/M and Fuzix or UZI?

Just curious.
George

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/2f0a29527fbcbbcf4f290abe256574ac77d8f7ca.camel%40gmail.com.

[George Farris]

That will take a little exploring, are we in a hurry for the board?

George

[Norberto Collado]

I do not think so!. The RAM IC is AS6C4008-55PCN. Specs attached.

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[George Farris]

This is a note from the Fuzix guys, I kind of like this scheme, still
trying to find info about how MP/M would have it.





An UZI target for z80pack.

Z80Pack has a simple 4K fixed common and 60K fixed sized banks. We run
FUZIX
with one application per bank and the memory map currently is

Bank 0:

0000-0080 Vectors
0081-0084 Saved CP/M command info
0088 UZI kernel start
???? UZI kernel end ~= A000
(big kernels go up to E400 or so!)
E800 Discard (blown away by user processes)
End of kernel: Common >= 0xF000
uarea
uarea stack
interrupt stack
bank switching code
user memory access copy
bank copy buffer because Z80Pack switching is slow
interrupt vectors and glue
[Possibly future move the buffers up here to allow for
more
disk and inode buffer ?]
FFFF Hard end of kernel room

Bank 1 to Bank n:
0000 Vector copy
0080 free
0100 Application
ECFF Application end
ED00-EFFF uarea stash

Disk swap device recommended

Put the kernel at the end of a floppy image from cyl 60
Add the fs in the first 58 cyls (366 blocks)

Put the bootblock in sector 0

dd the kernel image to offset 193024

ie

dd if=fuzix.bin of=drivea.cpm bs=1 seek=193024 conv=notrunc

On Tue, 2018-09-04 at 12:02 -0700, Norberto Collado wrote:

[George Farris]

This is from MP/M and looks as though the same scheme for Fuzix would
work here. Essential Bank 0 is OS related and Banks 1 through X are for
applications.


All Information Presented here is Proprietary to Digital Research
9
MP/M II Programmer's Guide
1.2
MP/M II Nucleus
1,2.6 Memory Management
The MP/M II nucleus can manage from one to eight memory
segments. These segments are of fixed length, and used primarily as
regions for loading transient programs. The partitions are page
aligned, which means that they must begin on a page boundary.
Because a page is defined as 256 bytes, a page boundary always
begins at an address where the low-order byte is 0. The nucleus
manages the memory resource with XDOS functions that allocate and
free memory segments. Figure 1-1 illustrates how memory is
organized under MP/M II.
Top of Memory
+------------+
: MP/M II :
(Common) : Operating :
: System :
: :
Top of Banked :------------: +--------+ +--------+
Memory : : :////////: :////////:
: Segment 0 : :////////: :////////:
: : :////////: :////////:
: : :////////: :////////:
: : :////////: :////////:
: MP/M II : :////////: :////////:
(Bank Switched) : Extension : :////////: :////////:
:------------: :////////: :////////:
:////////////: :////////: :////////:
:////////////: :////////: :////////:
:////////////: :////////: :////////:
Low :////////////: :////////: :////////:
Memory :////////////: :////////: :////////:
:////////////: :////////: :////////:
+------------+ +--------+ +--------+
Bank 0 Bank 1 .... Bank N

Figure 1-1. MP/M II Memory Organization
The shaded areas represent those regions that can support memory
segments. If bank-switched memory is not used, available memory is
restricted to bank zero. The total number of memory segments, in
addition to their size and bank locations, are system generation
options. Segment 0, however, is a special segment reserved for
system modules and RSPs. It always resides immediately below the
operating system region in bank 0

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[Lee Hart]

Norberto Collado wrote:
> The RAM Chip has been there since the first board. The question is how
> we drive the A16, A17 and A18 lines? Can someone provide an schematic?

Norberto, you can look at the schematic for my Z80-SIO card. It's at
<http://sunrise-ev.com/photos/z80/z80siobschematic.pdf> It bank-switches
a 512k byte RAM with a very small number of chips.

I also did a similar setup on my 8080 memory card. It bank-switches an
EPROM and RAM in a similarly small number of chips.

You're welcome to use or modify these designs if it would help.

[George Farris]

Unfortunately it looks like we would need a counter/timer chip to
properly run Fuzix to generate interrupts etc aka z180. I can't
remember does the H8 front panel generate interrupts via a clock?

[David Troendle]

Sorry I am coming to this late, but my time has been very limited.  Here are a things I can contribute:

1. Whatever path is decided, put me down for 3 boards.  I will build out one soon as I can and update the Assembly Guide found on Norby's site.
2. During the last winter break I started a program that can help recover a schematic from the Gerber files, which we have for this board.  It uses gerbview to get high resolution images of the layers and the drill guide.  Basically, this is just a multi-layer connected region problem with the traces on the layers forming the connected regions and the drill guide to connect the layers.  I added a dictionary of parts so that you can label the pads.  The output is a punch list of the lines on a schematic.  Unfortunately I lost the code in a system crash.  I can redo it if that would help, but I would not have time until January.  In the meantime, here's a question to consider:
3. Awhile ago there was some talk of a super Z80 board.  That would completely replace this board, but is a lot more work.  Has the time come for the super Z80 board?

David

[Lee Hart]

George Farris wrote:
> Unfortunately it looks like we would need a counter/timer chip to
> properly run Fuzix to generate interrupts etc aka z180. I can't
> remember does the H8 front panel generate interrupts via a clock?

Yes, the H8 (and H89) both have a 2 msec clock interrupt.

[Norberto Collado]

Thanks Lee and I will take a look at it. 

 

 -------- Original Message --------
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

From: Lee Hart <leea...@earthlink.net>
Date: Tue, September 04, 2018 1:00 pm
To: se...@googlegroups.com

Norberto Collado wrote:
> The RAM Chip has been there since the first board. The question is how
> we drive the A16, A17 and A18 lines? Can someone provide an schematic?

Norberto, you can look at the schematic for my Z80-SIO card. It's at
<http://sunrise-ev.com/photos/z80/z80siobschematic.pdf> It bank-switches
a 512k byte RAM with a very small number of chips.

I also did a similar setup on my 8080 memory card. It bank-switches an
EPROM and RAM in a similarly small number of chips.

You're welcome to use or modify these designs if it would help.

--
"Verschlimmbessern" (German, verb) - To make something worse by
trying to improve it. (English translation: "Microsoft"?)
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com

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[Norberto Collado]

Will do!

 

My version of the super board is to have the Z80 CPU with the ORG0/H67/H37/Dual serial Port/H17 (swap out H17 with H37)/Speed Control, RTC.

 

Others might have a different version like Bank Switching, Z180, etc...

 

Norberto

 

-------- Original Message --------
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

From: David Troendle <Da...@Troendle.org>
Date: Tue, September 04, 2018 2:48 pm
To: SEBHC <se...@googlegroups.com>

Sorry I am coming to this late, but my time has been very limited.  Here are a things I can contribute:

1. Whatever path is decided, put me down for 3 boards.  I will build out one soon as I can and update the Assembly Guide found on Norby's site.
2. During the last winter break I started a program that can help recover a schematic from the Gerber files, which we have for this board.  It uses gerbview to get high resolution images of the layers and the drill guide.  Basically, this is just a multi-layer connected region problem with the traces on the layers forming the connected regions and the drill guide to connect the layers.  I added a dictionary of parts so that you can label the pads.  The output is a punch list of the lines on a schematic.  Unfortunately I lost the code in a system crash.  I can redo it if that would help, but I would not have time until January.  In the meantime, here's a question to consider:
3. Awhile ago there was some talk of a super Z80 board.  That would completely replace this board, but is a lot more work.  Has the time come for the super Z80 board?

David

On Sunday, September 2, 2018 at 11:45:17 PM UTC-5, Norby wrote:

I will send them the Gerbers as I’m making changes.

 

Here is how it looks now!

 

Norberto

 

From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of ShadowTron Blog

Sent: Sunday, September 02, 2018 8:29 PM
To: SEBHC

Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

I don't have a quote for updating the gerbers; OURPCB asked to have the GERBERS emailed/uploaded so they could provide a quote.

-Neil

On Friday, August 31, 2018 at 11:50:02 AM UTC-7, Norby wrote:

There should not be any tooling fees as I paid for it. Please send me the quote to check with them.

Sent from my iPhone

On Aug 30, 2018, at 7:20 PM, ShadowTron Blog <shadowt...@gmail.com> wrote:

I've been emailing with OURPCB and they can update the gerbers on Noberto's original PO. There will be a tooling fee but I should be able to cover it. Per the email the cost is fixed from 1-8 boards so I'll order 8 to of course offer up here on the forum.

 

Noberto - Do I have your permission to get the gerbers updated? if so where can I get the current set of files?

 

-Neil

On Tuesday, August 28, 2018 at 11:27:53 AM UTC-7, ShadowTron Blog wrote:

I'm looking for a "H8-Z80-64-V2.2" blank PCB. Hoping someone has one? 

 

Note that I've posted a series of video's on my build of the "H8 8080A 64K RAM BRD" board should anyone be bored enough to watch me solder.

 

https://www.youtube.com/watch?v=xpvd9NF3iq0

 

-Neil

 

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[Norberto Collado]

lee,

 

As you are controlling externally B15,B16,B17, and B18, that means that on power-on the system will see only 32KB as B15 is used instead of A15. A15 is used to control the memory decoder thru D0 latch circuit.

 

Not sure if I captured this correctly.

 

Thanks,

Norberto

 

-------- Original Message --------
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

From: Lee Hart <leea...@earthlink.net>
Date: Tue, September 04, 2018 1:00 pm
To: se...@googlegroups.com

Norberto Collado wrote:
> The RAM Chip has been there since the first board. The question is how
> we drive the A16, A17 and A18 lines? Can someone provide an schematic?

Norberto, you can look at the schematic for my Z80-SIO card. It's at
<http://sunrise-ev.com/photos/z80/z80siobschematic.pdf> It bank-switches
a 512k byte RAM with a very small number of chips.

I also did a similar setup on my 8080 memory card. It bank-switches an
EPROM and RAM in a similarly small number of chips.

You're welcome to use or modify these designs if it would help.

--
"Verschlimmbessern" (German, verb) - To make something worse by
trying to improve it. (English translation: "Microsoft"?)
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com

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[ShadowTron Blog]

When the board is ready please put me down for two. If you decide to get prototype boards before the final order I'm willing to assemble / test one of them as well.

[Norberto Collado]

I almost forgot that Lee gave me a pair of 16C2550 dual ACE UART to add to the CPU board. I will add that as well to get at least two serial ports with a single IC.

 

Norberto

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[Lee Hart]

Norberto Collado wrote:
> I almost forgot that Lee gave me a pair of 16C2550 dual ACE UART to add
> to the CPU board. I will add that as well to get at least two serial
> ports with a single IC.

Yes, they are an interesting part. There were apparently multiple
sources of it too, just like the original 8250 ACE.

The ACE has 4 general-purpose inputs and outputs. They are intended for
modem handshake lines, but can in fact be used for whatever you like.
Most software in the Heath world does not use these signals.

The 16C2550 dual ACE has two sets of these I/O pins. There is quite a
lot you can do with that many pins. :-)

You asked how the bank switching works on my Z80-SIO card. I used the
handshake lines on the ACE to control the extra address lines of the 512
Kbyte RAM.

The main CPU board has a 32k EPROM at 0-32k, and a 32k RAM at 32-64k.
Each of these can be enabled/disabled by the /ROM and /RAM pins on the
bus. If one of these lines is pulled high, it disables the respective
memory chip.

The Z80-SIO card uses this feature to disable the CPU board ROM, and
replace it with a 32k block of RAM from the 512k RAM chip. There are 16
32k blocks in the 512k RAM, and you select which one you want with the 4
handshake bits from the ACE.

74HCT151 U4 is there to model the behavior of the H8 and H89 Bank 0
memory. When the CPU board ROM is enabled, *writes* to the ROM will
actually go to the selected bank in the 512k RAM. This allows you to
initialize the RAM before enabling it.

The 8080 Membership Card Memory-IO board
<http://sunrise-ev.com/photos/8080/8080mio.pdf> has a more sophisticated
bank switching setup. It let me use just two memory chips (one EPROM,
one RAM) to use anything from 2k-64k of EPROM and 2k-512k of RAM. It has
jumper options for bank sizes from 4k to 32k.

Hope this helps!

--
Imagination is your preview of life's coming attractions.
(Albert Einstein)

[Norberto Collado]

Thanks Lee! 

 

-------- Original Message --------
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB
From: Lee Hart <leea...@earthlink.net>

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[Norberto Collado]

Also I will  try to add the capability to mount on side 2 the Z67-IDE+ controller as well.

 

-------- Original Message --------
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB
From: Norberto Collado <norberto...@koyado.com>
Date: Wed, September 05, 2018 9:18 pm
To: "se...@googlegroups.com" <se...@googlegroups.com>

I almost forgot that Lee gave me a pair of 16C2550 dual ACE UART to add to the CPU board. I will add that as well to get at least two serial ports with a single IC.

 

Norberto

 

From: "se...@googlegroups.com" <se...@googlegroups.com> on behalf of ShadowTron Blog <shadowt...@gmail.com>
Reply-To: "se...@googlegroups.com" <se...@googlegroups.com>
Date: Wednesday, September 5, 2018 at 2:54 PM
To: "se...@googlegroups.com" <se...@googlegroups.com>
Subject: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

 

When the board is ready please put me down for two. If you decide to get prototype boards before the final order I'm willing to assemble / test one of them as well.

-Neil

On Tuesday, August 28, 2018 at 11:27:53 AM UTC-7, ShadowTron Blog wrote:

I'm looking for a "H8-Z80-64-V2.2" blank PCB. Hoping someone has one? 

 

Note that I've posted a series of video's on my build of the "H8 8080A 64K RAM BRD" board should anyone be bored enough to watch me solder.

 

https://www.youtube.com/watch?v=xpvd9NF3iq0

 

-Neil

 

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[Norberto Collado]

After placing more net names, I saw “all” the outputs control signals of the
Z80 signals not been buffered and connected directly to the H8 bus. See
attached picture.



While trying to create an schematic from the board layout is too much time
consuming. I decided to clean up the board completely to build a new
schematic from scratch to at least add the following features if possible:



1. Leverage H89 schematics, so that is compatible with MMS CP/M3 to
upgrade to 128K of RAM.

2. RTC

3. Z80 Speed control

4. Two port Serial ports

5. Z67 board

6. Piggy back the Z67-IDE+ board and the H37/H17 boards (new layout)
on side 2 if possible.





Thanks,

Norberto

[Lee Hart]

Norberto Collado wrote:
> After placing more net names, I saw “all” the outputs control signals of the
> Z80 signals not been buffered and connected directly to the H8 bus. See
> attached picture.

I couldn't view the .dat file. What format is it in?

> 1. Leverage H89 schematics, so that is compatible with MMS CP/M3 to
> upgrade to 128K of RAM.
>
> 2. RTC
>
> 3. Z80 Speed control
>
> 4. Two port Serial ports
>
> 5. Z67 board
>
> 6. Piggy back the Z67-IDE+ board and the H37/H17 boards (new layout)
> on side 2 if possible.

A thought occurred to me: Today, it is fashionable to use modern micros
for everything; even to replace old dedicated chips like UARTs, parallel
ports, RTCs, etc. For example, I was looking at a "simple" 6502 design
that used a 6502, RAM, EPROM, and Atmel micro to provide the "glue" for
chip decoding and all I/O. Having the Atmel meant it was easy to provide
the address decoder, clock, reset, serial ports, and even a direct USB
interface, all in one chip. Adding features became a programming job,
rather than hardware design.

[Glenn Roberts]

Wow. That sounds amazing Norberto!

Sent from my iPhone

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> For more options, visit https://groups.google.com/d/optout.

> <winmail.dat>

[Norberto Collado]

Resending file.

Lee, Can you share the link to such diagram?

Thanks,
Norberto

-----Original Message-----
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Lee Hart
Sent: Saturday, September 08, 2018 4:06 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

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[George Farris]

I would prefer not to piggy back just for the design of the H8 but if
it is a performance problem then sure.

Could we just do a separate board that included the 37/17 and ide+?

Just my thoughts.

George

[Norberto Collado]

Hello George,

This is a better idea as I need to do a of compression on the Z80 board. It will be easier just to do another board with the H37/H17/H67/IDE+.

Thanks,
Norberto

-----Original Message-----
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of George Farris

Sent: Sunday, September 09, 2018 8:42 AM
To: se...@googlegroups.com
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

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[Norberto Collado]

Lee,

Just double checking as I have not read the specs yet on the 16C2550 DUART. The 16C2550 is compatible with the 16550, which is compatible with the 8250; correct? The H8 monitor should initialized during boot the 16C2550 without any changes to the OS; correct?

Thanks,
Norberto

-----Original Message-----
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Lee Hart
Sent: Wednesday, September 05, 2018 11:05 PM
To: se...@googlegroups.com

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[Lee Hart]

Norberto Collado wrote:
> Lee,
>
> Just double checking as I have not read the specs yet on the 16C2550 DUART. The 16C2550 is compatible with the 16550, which is compatible with the 8250; correct? The H8 monitor should initialized during boot the 16C2550 without any changes to the OS; correct?

Hi Norberto,

I haven't tried one in an H89; so I don't know if MTR-xx would work with
it as-is (or not). Reading the data sheet makes me think it *would*
work; but experimentation is needed!

It does have the FIFOs like a 16C550. But I think the default mode has
these disabled.

[Norberto Collado]

Attached is the schematic to place the part on the Z80 board. Now I wonder. Per spec it indicates that is compatible with the 16550...

So I will need to wire one of the IC's to the H89-SBC board to at least test one channel... This is a lot of work.

Thanks,
Norberto

-----Original Message-----
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Lee Hart
Sent: Tuesday, September 11, 2018 10:40 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

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[Lee Hart]

Norberto Collado wrote:
> Attached is the schematic to place the part on the Z80 board. Now I wonder. Per spec it indicates that is compatible with the 16550...
>
> So I will need to wire one of the IC's to the H89-SBC board to at least test one channel... This is a lot of work.

Yes indeed. That's why I haven't tried it yet. :-)

[Norberto Collado]

I will leave as it is and if it does not work, I can design a small board that will connect to the 16C2550 DUART socket with two 16550 on it to maintain same capabilities. I will need to add a small hole into the Z80 CPU pcb board to secure it if needed.

Thanks,

Norberto

-------- Original Message --------
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

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[Norberto Collado]

Attached is how is going to look after parts placement and pads routing. I left the right side untouched except for the single ROM and RAM backup voltage. Working on the left side of the board to place the RTC/ORG0/Clock/DUART/Battery backup RAM. The board will provide the clock for the H8 front panel. Also it uses the same program that we have for the H89 to change the clock speed that Ken wrote as I’m using same circuit as in the H89 to keep the parts count down.

 

I will eliminate the side select jumper and will wired the floppy side select signal directly to pin 18.

 

Thanks,

Norberto

[Glenn Roberts]

Awesome work Norberto.  We’ll have to call this an “H8-89” board!

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[Norberto Collado]

Perhaps. For now I’m only using the 444-61 for the I/O decoder to use same USART /ORG0 circuits from the H89 as well the CPU clock control.

 

Attached is a WIP schematic (not a complete one) showing only the new changes.

 

Norberto

 

From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Glenn Roberts
Sent: Thursday, September 13, 2018 5:39 AM
To: se...@googlegroups.com
Subject: RE: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

 

Awesome work Norberto.  We’ll have to call this an “H8-89” board!

 

From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Norberto Collado
Sent: Thursday, September 13, 2018 12:48 AM
To: se...@googlegroups.com
Subject: RE: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

 

Attached is how is going to look after parts placement and pads routing. I left the right side untouched except for the single ROM and RAM backup voltage. Working on the left side of the board to place the RTC/ORG0/Clock/DUART/Battery backup RAM. The board will provide the clock for the H8 front panel. Also it uses the same program that we have for the H89 to change the clock speed that Ken wrote as I’m using same circuit as in the H89 to keep the parts count down.

 

I will eliminate the side select jumper and will wired the floppy side select signal directly to pin 18.

 

Thanks,

Norberto

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[Norberto Collado]

Why /NMI is not used on the H8 board? I see it connected on the H89, and an option on the H8. Les board has no connection to such signal; just a pull-up.

 

Should I connected the /NMI signal as it is done on the H89?

 

Thanks,

Norberto

[Mark Garlanger]

On the H89, the NMI is used to emulate the I/O ports which the H8 had, but was lacking on the H89. Here is the ports, based from my H89 emulator source code:

    /// Address for NMI Addresses, used to respond to H8 ports.

    /// Octal 360-361 and 372-373

    static const BYTE          NMI_BaseAddress_1_c = 0xf0;

    static const BYTE          NMI_NumPorts_1_c    = 2;

    static const BYTE          NMI_BaseAddress_2_c = 0xfa;

    static const BYTE          NMI_NumPorts_2_c    = 2;

The H89 didn't have any other use for it, so I'm guessing the H8 doesn't need it.

Mark

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[Norberto Collado]

Thanks Mark!

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[Norberto Collado]

Also I'm trying to figure out why MMS CP/M3 boots on the H89 and not on the H8 and what mods I will need to make it work.

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[Steven Hirsch]

On 09/14/2018 01:53 PM, Norberto Collado wrote:
> Also I'm trying to figure out why MMS CP/M3 boots on the H89 and not on the H8
> and what mods I will need to make it work.

Probably something related to the MMS MMU piggyback? Douglas Miller would be
the authority on this.

[Douglas Miller]

I think I tried to simulate this, but probably need more information.
Have you got anything about what fails?

[Douglas Miller]

I recall being suspicious of the MMS "lock" on the MMU, which used some
"unused" bits in the system output port (0xF2). But, I haven't found any
H8 schematics that showed anything else connected to that port, so it
remains mystery.

Norberto, do you have any sort of logic analyzer you might be to gather
more information with?

[Norberto Collado]

I bought a cheap USB logic analyzer a way back and haven't use it yet. I will need information on what to connect and on what to trigger if I need to collect data.

As I update the H8 Z80 CPU board, the only two differences that I see is that the H8 does not use NMI and the H89 does. The second difference is that the H89 has a 1K RAM dedicated to the H17 and not on the H8. 

Everything else seems to be the same. 

Thanks,

Norberto

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[Douglas Miller]

The NMI triggers an upset stomach for me, but I must be thinking of the Kaypro. I'm guessing there are no disk controllers on the H89 that use NMI?

I think the thing to trace with the LA is the boot. But, I'm not certain exactly where things are going wrong. Did it hang during boot? You might first just take a sample when it is hung, and see what it is running. If it is something odd about the "MMU lock", then it might show up in the boot code, 2280-2480H. Out-of-the-box MMS CP/M3 expects the MM77318 128K RAM card, and that uses special bits in the system port to select memory banks. I think I generated CP/M3 images for different banked memory cards, though?

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[Norberto Collado]

The CP/M3 image that you provided boots fine on the stock H89, but not on the stock H8. The image that Steven provided is looking for the MMU which fails to boot on the stock H89 and it is expected.

So I'm using your image which should boot on either system unless it is hard coded someplace to only work on the H89.

Thanks,

Norberto

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[Douglas Miller]

OK, well that CP/M3 image still "unlocks" the MMU before selecting "Org 0", but I can't think of a reason that would cause problems on an H8 unless the H8 had something connected to those other bits on the system port.

The MMS code does not try to detect an H8, so any problem it is causing should be accidental. Is there an authoritative schematic set for the H8? I don't have one downloaded.

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[Douglas Miller]

I found an H8 schematic on Les Bird's site. Looks like I was working off mis-information.

Turns out, the H8 system port is nothing like the H89. The H89 port at 0F2H is not present on the H8, and equivalent controls are at port 0F0H on the H8, but in different bits.

I suspect this accounts for the hang. I'll have to simulate this difference and work on a new H8 version of CP/M 3.

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[Norberto Collado]

The Port for 0F2H is on the H8 bus. Schematics are here: http://sebhc.lesbird.com/documentation/hardware/H8/H8-8_As_Op_Sc.zip

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[Mark Garlanger]

I'm not sure why Heath used a different address for the GPP on the H89, vs the H8. But when you get it working on the H8, that same image should boot on the H89, since those 0xF0 accesses will converted for the 0xF2 address. Once the ROM is swapped out for the RAM, the same or similar code for the NMI handler would be needed in the RAM.

Mark

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[Douglas Miller]

Hmm, that's the same schematic I looked at.  I see no 362 port, only 360 and 361. I'm looking at the "front panel", the only other schematic was the CPU which had no I/O ports on it.

I'll need to know how "Org 0" is implemented on the H8, too, since that is not shown on this schematic.

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[Mark Garlanger]

For the ORG-0, it looks like the H17 changes on the lower right corner of the HA8-8 schematic show how ROM and RAM are enabled/disabled.

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[Douglas Miller]

MMS CP/M doesn't implement the NMI traps for H8, I'm not sure how any CP/M can since the memory around 0066H is used by CP/M (005CH-... is reserved), and I don't see that the hardware swaps in the ROM. It would be horribly inefficient anyway, incurring that overhead on every bank select.

The Kaypro saves 0066H (et al.) and sets up a vector there when it performs disk I/O (and restores previous contents after). Even that is a bit risky, although I can't think of any application that uses ~0066H as the DMA address.

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[Douglas Miller]

Ah, I see... different schematic set. They implement a 2-bit port at 362.

Thanks

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[Douglas Miller]

I've made changes to my virtual H89 to pretend to be an H8 (not yet tested), but I don't see that the monitor ROM uses a terminal so it looks like I'll have to construct the front panel. At least I have something similar for the TI990, so won't have to start from scratch. I got H8 ROM images from Les Bird, and it looks like 444-70 is my best bet - from those.

Unless someone knows of a monitor ROM that uses a terminal?

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[Norberto Collado]

I finalized the Z80 Board layout. I will let it sit for a couple days to review again for any honest layout mistakes. Then I will order 3 boards to check it out. Attached are some pictures on how it looks.

Also I added a jumper to select which monitor to boot from XCON-8 or PAM-37.

Thanks,
Norberto

[Les Bird]

Norberto this layout is fantastic. Glad you got rid of the GIDE section. At the time I designed the original it seemed like a good idea. I’ll definitely be interested in getting a few of these.


Sent from Yahoo Mail for iPad

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[Douglas Miller]

I have a semi-functional H8 front panel, but the kaypad is not working as described in the documentation. The '4' key seems to try and boot, and the '+' and '-' keys cycle between display of various registers. Other keys seem to be ignored. It also appears that this ROM only boots the H17. Is the ROM "2732_444-70_XCON8.ROM" the correct one to be using? How does one boot off the H37 or H67?

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[Kenneth L. Owen]

Hi Douglas,

 

See if this helps ...

 

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[Glenn Roberts]

Ditto.  Great to see new life in this board!

 

Speaking of GIDE I believe I have the chips to fill out that section if anyone needs them.  When I got my board it had been built out including those chips, but I’ve never used them,  going with the IDE+ instead…

 

• Glenn

 

 

From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Les Bird
Sent: Sunday, September 16, 2018 1:26 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

 

Norberto this layout is fantastic. Glad you got rid of the GIDE section. At the time I designed the original it seemed like a good idea. I’ll definitely be interested in getting a few of these.

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[Douglas Miller]

Thanks Kenneth, that helps. It seems that the "H17" ROM is also required, although I did not see it on a schematic. Looked to me like it was part of the H17, so that would mean you can't boot an H8-37 unless you also have an H8-17 installed. I'm sure I'm missing something...

OK, on to the next problem.

Thanks!

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[Douglas Miller]

So, back on track but out of time until next weekend. I was able to boot HDOS2 on the H17, and tried out the boot of MMS CP/M 3 on the H37. The latter hung right after the loader signon message, and a quick trace showed that, as I suspected, the problem is because the INT1 (2mS) clock interrupt control bit is not where it is on the H89, so the code gets stuck in an endless interrupt because it never resets the 2mS clock.

I can now work on changes to fix that, although it is going to require changes to both the Loader BIOS as well as the CP/M BIOS. Once I have an image ready, I'll post.

Norberto, which memory controller do you want to use first? I was previously working towards the X2/H8, but maybe you are using something else now?

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[Norberto Collado]

Can you keep the X2/H8 for the H8 system as my system is setup for such controller?

 

The H89 uses Int1 for the 2ms clock as shown in the attached picture.

 

Thanks,

Norberto

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[Norberto Collado]

Thanks Les and Glenn!  Hopefully it works as I added a lot of features and traces. J

 

If this works fine, then I can work in getting the H17/H67/H37 on a single H8 board and piggy back the Z67-IDE on side 2. I think this is feasible as I can leverage the H89-SBC circuits to keep parts count down.

 

Then for the H8, you just need three boards, front panel, Z80 CPU, and Storage board. A four one with USB support.

 

Thanks,

Norberto

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[Douglas Miller]

OK, will continue with X2/H8.

Yes, both H89 and H8 use INT1 for the 2Ms clock, but the H8 enables/disables it by bit 6 of port F0H while the H89 uses bit 1 of port F2H. In addition, the reset of the interrupt line requires a write to the respective port. So, H89 code running on an H8 will either fail to enable/disable the 2mS clock, or else fail to reset it after taking the interrupt. I'm not sure the exact scenario that led to what I saw, but the H89 code has no chance of recovering since it never writes to port F0H. I'm guessing the H8 ROM must not turn off the 2mS interrupt when it jumps to the boot code, or else something must have resulted in it being turned back on.

I'll need to make an H8-specific version of the BIOS, and scrub all the code to make sure I locate all the places that port F2 is used (for interrupt control). The H17 side-select and ORG-0 bits are the same between both models.

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/037001d44e1d%24d68b2b90%2483a182b0%24%40koyado.com.

[Norberto Collado]

Great detective work Douglas! I see that a write to port 362Q on the H89 triggers the 2MS interrupt. The H8 does not do this as port 362Q is outside the Z80 controller board, neither on the H8 front panel.

 

To avoid code changes, on the new Z80 board I can enable writing to port 362Q as is already present there. I have the same logic as the H89 in place but not connected.

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[Norberto Collado]

Here is the schematic for such change! The good thing about this is that I do not need the H8 front panel anymore to run this Z80 board. I can use the H89 monitor as well. The only limitation is that I do not have the space for the single step circuit (INT2) to be H89 equivalent.

 

Norberto

 

From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado

Sent: Sunday, September 16, 2018 7:54 PM
To: se...@googlegroups.com

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/038701d44e31%24b5bc0830%2421341890%24%40koyado.com.

[Norberto Collado]

Here is the final board and will do another pass during next weekend and then I will order some boards to check them out.

 

Also I added the H89 emulation circuit for /INT2.

 

Thanks,

Norberto

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/037601d44e1f%2473ae1c10%245b0a5430%24%40koyado.com.

[Norberto Collado]

Douglas,

 

I added the circuit for the new board to emulate the 2ms /INT1 signal and hopefully it will work as expected! J

 

Thanks,

Norberto

 

From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado

Sent: Sunday, September 16, 2018 7:54 PM
To: se...@googlegroups.com

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/038701d44e31%24b5bc0830%2421341890%24%40koyado.com.

[Douglas Miller]

Oh, I get it... you are making the F2 port to be identical to the H89, which should allow the software to run as-is. MMS CP/M requires a Z80, so no one is going to be able to run this on a "stock" H8 anyway. I personally never used single-step, and there's no code in MMS CP/M to use it, so I guess we get by without it.

Let me know if that allows you to boot CP/M 3

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[Norberto Collado]

Yes same circuit as the H89 and it is a Z80 board. Once I get the new board, I will test it with CP/M3.

 

Thanks for finding this issue and just in time.

 

Norberto

 

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[Les Bird]

Norberto you might want to change the revision to 3.0 since the changes are quite significant. I think this qualifies as a 3.0 board and if there are any minor updates to the GIDE design then the revision can still use the 2.x numbers.

Sent from my iPhone

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<H8-Z80-64-33-SINGE-ROM-RTC.jpg>

[Norberto Collado]

Great feedback and will do that change. 

Norberto

-------- Original Message --------
Subject: Re: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB
From: Les Bird <les...@bellsouth.net>
Date: Mon, September 17, 2018 7:53 am
To: se...@googlegroups.com

Norberto you might want to change the revision to 3.0 since the changes are quite significant. I think this qualifies as a 3.0 board and if there are any minor updates to the GIDE design then the revision can still use the 2.x numbers.

Sent from my iPhone

On Sep 17, 2018, at 1:46 AM, Norberto Collado <norberto...@koyado.com> wrote:

Here is the final board and will do another pass during next weekend and then I will order some boards to check them out.

 

Also I added the H89 emulation circuit for /INT1.

To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/186A25AB-E3B8-42EE-A55D-4422C657B8B8%40bellsouth.net.

[Norberto Collado]

Did another review this evening with some improvements to the board. Attached is latest schematic “only for the new changes” along with the BOM for the whole board. The board looks pretty busy now and hoping for the best. Will do another pass tomorrow looking for honest mistakes and then will order a few.

 

Thanks,

Norberto

[Norberto Collado]

I did some more improvements and did not find any more issues, so I ordered three boards to check them out. I just got confirmation that they are working on this board.

 

I will post into the website all this information and I hope it works on first power-on. J I will provide a single ROM with both PAM-37 and XCON-8 or with PAM-37 and MTR90 if you want to use the board standalone without the front panel without the single step capability. This capability is jumper selectable.

 

I’m more excited to see it booting CP/M3, so that I can have my 128KB working with it. If this works, then I can easily duplicate my 128KB board.

 

Let me start looking into the single storage board with H17/H67/H37 capabilities. Also looking into having the USB as well but challenging.

 

Thanks,

Norberto

 

From: Norberto Collado [mailto:norberto...@koyado.com]
Sent: Monday, September 17, 2018 8:15 PM
To: 'se...@googlegroups.com'
Subject: RE: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

 

Did another review this evening with some improvements to the board. Attached is latest schematic “only for the new changes” along with the BOM for the whole board. The board looks pretty busy now and hoping for the best. Will do another pass tomorrow looking for honest mistakes and then will order a few.

 

Thanks,

Norberto

[Norberto Collado]

All,

Just got confirmation that the H8 Z80 boards will be on my hands by this weekend. I hope for the best and that it will work as it was hard to do changes. I had to chase each trace individually to ensure that I was connecting to the correct place and honest mistakes can happen.

:)

-------- Original Message --------
Subject: RE: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB
From: "Norberto Collado" <norberto...@koyado.com>
Date: Tue, September 18, 2018 11:09 pm
To: <se...@googlegroups.com>

I did some more improvements and did not find any more issues, so I ordered three boards to check them out. I just got confirmation that they are working on this board.

 

I will post into the website all this information and I hope it works on first power-on. J I will provide a single ROM with both PAM-37 and XCON-8 or with PAM-37 and MTR90 if you want to use the board standalone without the front panel and without the single step capability. This capability is jumper selectable.

 

I’m more excited to see it booting CP/M3, so that I can have my 128KB working with it. If this works, then I can easily duplicate my 128KB board.

 

Let me start looking into the single storage board with H17/H67/H37 capabilities. Also looking into having the USB as well but challenging.

 

Thanks,

Norberto

 

From: Norberto Collado [mailto:norberto...@koyado.com]
Sent: Monday, September 17, 2018 8:15 PM
To: 'se...@googlegroups.com'
Subject: RE: [sebhc] Re: Norberto's H8-Z80-64-V2.2 PCB

 

Did another review this evening with some improvements to the board. Attached is latest schematic “only for the new changes” along with the BOM for the whole board. The board looks pretty busy now and hoping for the best. Will do another pass tomorrow looking for honest mistakes and then will order a few.

 

Thanks,

Norberto

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[Norberto Collado]

New Z80 board in and will start the assembly this week.

Pictures attached.

Norberto