H8 System
Norberto Collado
Saw this H8 system for $275.00 and couldn’t resist to buy it. I will like to transform this one to use the PC power supply, now that I’m almost done with my Ultimate H8 system.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=380643768190#ht_4492wt_1397
Norberto
Les Bird
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Norberto Collado
Try Radio Shack! Also since I got my first H8 I always used the Dual Cassette Recorder which is more stable than the regular player. Also it allows me to do a tape to tape copy for backup purposes. I have a lot of heath tapes to recover and I can us this system to do that.
On your Z80 CPU board, can you do add the last fix to enable external interrupts? I will like to get a board without any wires. You will need to add a 3 pin header, so that I can select Internal or External interrupts. I think that should be the last change to have a 100% functional board without the need to cut traces or add wires.
Internal interrupts = no H37 installed
External Interrupts = H37 installed.
See attached picture for details.
Thanks,
Norberto
Norberto Collado
Forgot to send second picture!
From: Norberto Collado [mailto:norberto...@koyado.com]
Sent: Saturday, May 18, 2013 11:00 AM
To: 'se...@googlegroups.com'
Subject: RE: [sebhc] H8 System
Try Radio Shack! Also since I got my first H8 I always used the Dual Cassette Recorder which is more stable than the regular player. Also it allows me to do a tape to tape copy for backup purposes. I have a lot of heath tapes to recover and I can us this system to do that.
On your Z80 CPU board, can you do add the last fix to enable external interrupts? I will like to get a board without any wires. You will need to add a 3 pin header, so that I can select Internal or External interrupts. I think that should be the last change to have a 100% functional board without the need to cut traces or add wires.
Internal interrupts = no H37 installed
External Interrupts = H37 installed.
See attached picture for details.
Thanks,
Norberto
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Les Bird
Sent: Saturday, May 18, 2013 10:30 AM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
Great find Norby. That's a nice looking H8-5 in there. I'm in the process of putting together a cassette system for transferring tapes but I can't find a tape player that works... Of all things.
Norberto Collado
One more thing! During the troubleshooting of the H8-RTC board, I found that when I pressed the two keys on the H8 front panel to do a Master reset, the 555 timer on your board starts to oscillate if I keep this condition. We need to fix this issue as well.
Norberto
Glenn Roberts
Sent from my iPad
--
Les Bird
Norberto Collado
Besides the price, the driving force is that it looks complete!
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Glenn Roberts
Sent: Saturday, May 18, 2013 1:21 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
Glad you grabbed it. That's a fair "buy now" price compared to what some of them go for!
Norberto Collado
Yes, I can open the file. I will check it out and if changes, then I will send you the updated file to archive. I need to investigate the 555 oscillations on reset.
Thanks,
Norby
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/f5540c60-9329-40cc-91b0-ee7ec940d3a9%40googlegroups.com?hl=en-US.
Norberto Collado
Changes are fine; just took out the via left.
Also I traced the 555 output and it connects to U9 pin 5 which is fine. Somehow U9 Pin 4 is also connected to it. On the Heath Z80 I do not see any additional connections to this gate. Can you review your traces? See below;
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/f5540c60-9329-40cc-91b0-ee7ec940d3a9%40googlegroups.com?hl=en-US.
Norberto Collado
My bad! It is an 74LS00 and I was thinking about 74LS04. Can you add a 2.2uf to the output of U9 pin 6 to ground?
Norby
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Saturday, May 18, 2013 5:15 PM
To: se...@googlegroups.com
Subject: RE: [sebhc] H8 System
Changes are fine; just took out the via left.
Norberto Collado
Thanks and it looks fine. I will order three with my next order of the H8-RTC boards.
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Les Bird
Sent: Saturday, May 18, 2013 6:56 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
Ok Norby, new KiCad file attached.
- Les
On Saturday, May 18, 2013 8:22:09 PM UTC-4, Norby wrote:
My bad! It is an 74LS00 and I was thinking about 74LS04. Can you add a 2.2uf to the output of U9 pin 6 to ground?
Norby
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Saturday, May 18, 2013 5:15 PM
To: se...@googlegroups.com
Subject: RE: [sebhc] H8 System
Changes are fine; just took out the via left.
Also I traced the 555 output and it connects to U9 pin 5 which is fine. Somehow U9 Pin 4 is also connected to it. On the Heath Z80 I do not see any additional connections to this gate. Can you review your traces? See below;
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/c7a4d5be-78af-489a-a80d-84a01cc8c5a5%40googlegroups.com?hl=en-US.
Glenn Roberts
Sent from my iPhone
Thanks and it looks fine. I will order three with my next order of the H8-RTC boards.
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Les Bird
Sent: Saturday, May 18, 2013 6:56 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
Ok Norby, new KiCad file attached.
- Les
On Saturday, May 18, 2013 8:22:09 PM UTC-4, Norby wrote:
My bad! It is an 74LS00 and I was thinking about 74LS04. Can you add a 2.2uf to the output of U9 pin 6 to ground?
Norby
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Saturday, May 18, 2013 5:15 PM
To: se...@googlegroups.com
Subject: RE: [sebhc] H8 System
Changes are fine; just took out the via left.
Also I traced the 555 output and it connects to U9 pin 5 which is fine. Somehow U9 Pin 4 is also connected to it. On the Heath Z80 I do not see any additional connections to this gate. Can you review your traces? See below;
<image001.jpg>
<image002.jpg>
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/008e01ce5439%24d5eb4dc0%2481c1e940%24%40koyado.com?hl=en-US.
Les Bird
Norberto Collado
Les,
We need to enable U305 (TL7705A) Voltage supervisor to provide the proper reset signal to the CPU and the H8 bus based on my experience with the RTC circuitry. We will need to add a three pin header that will connect the output of the TL7705 to drive the CPU, BUS reset signal or to keep current capabilities if not planning to use the TL7705. Below is a proposal and please check the logic level to be correct!
Norberto Collado
How about this for the next group order?
H8-Z80180
Upgrade Les’s Z80 board to handle the Z80180 CPU @ 33MHz and to have MMU addressing up to 1MB; 68-Pin PLCC package.
Changes to Les’s Z80 Board:
1. Replace the two 2732 EPROMS with a single EEPROM. Add WP jumpers.
2. Replace current RAM with larger size DIMM to support 1MB (minus 8KB for EEPROM) for CP/M.
3. Add two serial ports
4. Replace 40-pin DIP Z80 with 68-pin PLCC Z80180 CPU.
5. Add support to be able to flash the EEPROM via the serial port.
I want one!
Norberto
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Glenn Roberts
Sent: Sunday, May 19, 2013 6:13 AM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
You guys are talking about a new and slightly improved version of Les' Z80 board? I presume if these work out we could organize a larger group order?
Sent from my iPhone
Glenn Roberts
Wow, sounds awesome!
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Monday, May 20, 2013 3:22 AM
To: se...@googlegroups.com
Subject: RE: [sebhc] H8 System
How about this for the next group order?
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jmcg...@windstream.net
Glenn Roberts
Norberto Collado
steve shumaker
count me in.
Steve
On 5/20/2013 12:21 AM, Norberto Collado wrote:
>
> How about this for the next group order?
>
> H8-Z80180
>
>
> 1. Replace the two 2732 EPROMS with a single EEPROM. Add WP jumpers.
>
> 2. Replace current RAM with larger size DIMM to support 1MB (minus 8KB
> for EEPROM) for CP/M.
>
> 3. Add two serial ports
>
> 4. Replace 40-pin DIP Z80 with 68-pin PLCC Z80180 CPU.
>
> 5. Add support to be able to flash the EEPROM via the serial port.
>
> I want one!
>
> Norberto
>
> Behalf Of *Glenn Roberts
> *Sent:* Sunday, May 19, 2013 6:13 AM
> *To:* se...@googlegroups.com
> *Subject:* Re: [sebhc] H8 System
> You guys are talking about a new and slightly improved version of Les'
> Z80 board? I presume if these work out we could organize a larger
> group order?
>
> Sent from my iPhone
>
>
>
> You received this message because you are subscribed to the Google
> Groups "SEBHC" group.
> To unsubscribe from this group and stop receiving emails from it, send
> an email to sebhc+un...@googlegroups.com.
> To post to this group, send email to se...@googlegroups.com.
> To view this discussion on the web visit
Terry Gulczynski
I have a small adapter PCB that replaces the Z80 CPU with a Z8S180 CPU.� The adapter also carries a single 512K RAM on-board, and allows the use of the regular RAM on the CPU board.� In theory, it will work in any Z80-based machine.
Les' latest rev Z80 CPU board is the only CPU board that has received any testing.� The adapter fits on the CPU board fairly well, but there must be room between the CPU board and the front panel - it may require skipping the first expansion slot (which might be OK for use with one of Norberto's very small expansion cards - or may not.� I just don't know.)
The pair of EPROMs (PAM37 and XCON8) are replaced.� The basic functionality of the PAM37 EPROM is retained, but has been modified to allow the 'hooks' needed to add the following to the EPROM code:
- Z8S180 CPU initialization
- GIDE Initialization
- Terminal I/O
- RAM and GIDE testing routines
- GIDE Boot
Since the PAM37 EPROM doesn't have the necessary space, the XCON8 EPROM was stripped of all PAM8 functionality while retaining the still-required H17 ROM code.� This provides 2K of EPROM space to add the routines mentioned above.
(Note that when the XCON8 EPROM is used in the PAM37-based H8, the PAM8 ROM is unused.� That might sound misleading to some: the XCON8 contains the PAM8 ROM code AND the H17 ROM code, each taking 2K of the 4K EPROM.� Removing the PAM8 code - which IS NOT USED in the PAM37-based H8 - provides 2K of ROM space while leaving the still-required H17 code intact.� That 2K is what I'm using for the expanded functionality.)
All that aside, the adapter works well so far.� My original plan was to make the adapter available on the H89 in addition to the H8, but it doesn't fit well - the flyback transformer is in the way.� It DOES fit well on the PC-89 (H89 CPU in a PC mid-tower case) but I haven't done any work with it yet.
Finally, the adapter is far from 'ready for prime-time.'� Yes, it works.� Yes, it boots the H17-based SVD and runs from there.� Yes, there are some terminal I/O routines in the EPROM, and yes, you can boot the system from the terminal rather than the H8's front panel.� All GIDE and RAM tests are performed via the terminal.
From the front panel, the H8 is identical to the previous PAM37 EPROM, with a few additions to support GIDE boot - but ALL previous PAM37 functionality remains as-is.
The add-on adapter is a cheap and quick method for software design, but the CPU board replacement is the ultimate goal.� As Norberto already knows, I'm prepared to support this endeavor with whatever assistance he might want.� Some of the necessary support code is already done - more is needed.� I haven't fooled with it in quite a while, but I WILL get back to it one day soon.
The interest shown since Norberto's recent post suggests I should get back to it fairly soon.
Terry
On 5/20/2013 9:41 AM, Norberto Collado wrote:
This is an idea based on Terry's�Z80180�H89 design. It is up to Les and Terry to decide if they want to drive the development of this board.�
Norberto
-------- Original Message --------
Subject: Re: [sebhc] H8 System
From: Glenn Roberts <glenn.f...@gmail.com>
Date: Mon, May 20, 2013 6:18 am
To: "se...@googlegroups.com" <se...@googlegroups.com>
to be clear, you're not calling for list of orders yet right?� too early...�- glenn�
On Mon, May 20, 2013 at 7:15 AM, <jmcg...@windstream.net> wrote:
Please put me down for 2 of these boards if they are built.
�Joe�
----- Original Message -----From: Glenn RobertsSent: Monday, May 20, 2013 5:30 AMSubject: RE: [sebhc] H8 System
Wow, sounds awesome!�
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Monday, May 20, 2013 3:22 AM
To: se...@googlegroups.com
Subject: RE: [sebhc] H8 System
�
How about this for the next group order?
�H8-Z80180�Upgrade Les�s Z80 board to handle the Z80180 CPU @ 33MHz and to have MMU addressing up to 1MB; 68-Pin PLCC package.�
Changes to Les�s Z80 Board:
1.������ Replace the two 2732 EPROMS with a single EEPROM. Add WP jumpers.2.������ Replace current RAM with larger size DIMM to support 1MB (minus 8KB for EEPROM) for CP/M.3.������ Add two serial ports4.������ Replace 40-pin DIP Z80 with 68-pin PLCC Z80180 CPU.5.������ Add support to be able to flash the EEPROM via the serial port.�I want one!�Norberto�
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Glenn Roberts
Sent: Sunday, May 19, 2013 6:13 AM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
�
You guys are talking about a new and slightly improved version of Les' Z80 board? I presume if these work out we could organize a larger group order?
Sent from my iPhone
�
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�
�
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�
�
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�
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�
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�
�
Norberto Collado
Terry,
Great feedback! I will like to break this project into baby steps;
1. Clean-up Les’ Z80 board with the mods suggested. Order proto board to check functionality.
2. On the new board map all the CPU connections to RAM, ROMS, etc, by editing and adding a net name to each one.
3. Delete CPU footprint
4. Add new CPU footprint and all CPU signals will AutoRoute manually
5. Delete RAM footprint
6. Add new RAM and signals will AutoRoute manually
7. Delete PAM37/XCON-8 EPROM
8. Add new EEPROM and signals will AutoRoute manually.
9. Clean-up CS and I/O decoder for a single EEPROM selection
10. Clean-up above 64K RAM selection
11. Get proto’s
12. Debug proto along with Terry.
I’m assuming that I can still support the H8-Z67 and the H8-Z37 controllers in addition to the H17 and GIDE; correct?
Norberto
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Terry Gulczynski
Sent: Monday, May 20, 2013 8:06 AM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
To add some clarification to Norberto's post...
I have a small adapter PCB that replaces the Z80 CPU with a Z8S180 CPU. The adapter also carries a single 512K RAM on-board, and allows the use of the regular RAM on the CPU board. In theory, it will work in any Z80-based machine.
Les' latest rev Z80 CPU board is the only CPU board that has received any testing. The adapter fits on the CPU board fairly well, but there must be room between the CPU board and the front panel - it may require skipping the first expansion slot (which might be OK for use with one of Norberto's very small expansion cards - or may not. I just don't know.)
The pair of EPROMs (PAM37 and XCON8) are replaced. The basic functionality of the PAM37 EPROM is retained, but has been modified to allow the 'hooks' needed to add the following to the EPROM code:
- Z8S180 CPU initialization
- GIDE Initialization
- Terminal I/O
- RAM and GIDE testing routines
- GIDE Boot
Since the PAM37 EPROM doesn't have the necessary space, the XCON8 EPROM was stripped of all PAM8 functionality while retaining the still-required H17 ROM code. This provides 2K of EPROM space to add the routines mentioned above.
(Note that when the XCON8 EPROM is used in the PAM37-based H8, the PAM8 ROM is unused. That might sound misleading to some: the XCON8 contains the PAM8 ROM code AND the H17 ROM code, each taking 2K of the 4K EPROM. Removing the PAM8 code - which IS NOT USED in the PAM37-based H8 - provides 2K of ROM space while leaving the still-required H17 code intact. That 2K is what I'm using for the expanded functionality.)
All that aside, the adapter works well so far. My original plan was to make the adapter available on the H89 in addition to the H8, but it doesn't fit well - the flyback transformer is in the way. It DOES fit well on the PC-89 (H89 CPU in a PC mid-tower case) but I haven't done any work with it yet.
Finally, the adapter is far from 'ready for prime-time.' Yes, it works. Yes, it boots the H17-based SVD and runs from there. Yes, there are some terminal I/O routines in the EPROM, and yes, you can boot the system from the terminal rather than the H8's front panel. All GIDE and RAM tests are performed via the terminal.
From the front panel, the H8 is identical to the previous PAM37 EPROM, with a few additions to support GIDE boot - but ALL previous PAM37 functionality remains as-is.
The add-on adapter is a cheap and quick method for software design, but the CPU board replacement is the ultimate goal. As Norberto already knows, I'm prepared to support this endeavor with whatever assistance he might want. Some of the necessary support code is already done - more is needed. I haven't fooled with it in quite a while, but I WILL get back to it one day soon.
The interest shown since Norberto's recent post suggests I should get back to it fairly soon.
Terry
On 5/20/2013 9:41 AM, Norberto Collado wrote:
This is an idea based on Terry's Z80180 H89 design. It is up to Les and Terry to decide if they want to drive the development of this board.
Norberto
-------- Original Message --------
Subject: Re: [sebhc] H8 System
From: Glenn Roberts <glenn.f...@gmail.com>
Date: Mon, May 20, 2013 6:18 am
To: "se...@googlegroups.com" <se...@googlegroups.com>
to be clear, you're not calling for list of orders yet right? too early...
- glenn
On Mon, May 20, 2013 at 7:15 AM, <jmcg...@windstream.net> wrote:
Please put me down for 2 of these boards if they are built.
Joe
----- Original Message -----
From: Glenn Roberts
Sent: Monday, May 20, 2013 5:30 AM
Subject: RE: [sebhc] H8 System
Wow, sounds awesome!
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Monday, May 20, 2013 3:22 AM
To: se...@googlegroups.com
Subject: RE: [sebhc] H8 System
How about this for the next group order?
H8-Z80180
Upgrade Les’s Z80 board to handle the Z80180 CPU @ 33MHz and to have MMU addressing up to 1MB; 68-Pin PLCC package.
Changes to Les’s Z80 Board:
1. Replace the two 2732 EPROMS with a single EEPROM. Add WP jumpers.
2. Replace current RAM with larger size DIMM to support 1MB (minus 8KB for EEPROM) for CP/M.
3. Add two serial ports
4. Replace 40-pin DIP Z80 with 68-pin PLCC Z80180 CPU.
5. Add support to be able to flash the EEPROM via the serial port.
I want one!
Norberto
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Glenn Roberts
Sent: Sunday, May 19, 2013 6:13 AM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
You guys are talking about a new and slightly improved version of Les' Z80 board? I presume if these work out we could organize a larger group order?
Sent from my iPhone
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Terry Gulczynski
Terry
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Norberto Collado
Received the H8 system well packed and I will document its progress in my website as I rebuild the system. Below are some pictures as I unpacked the H8 system. It was hard to take the boards out and after reseating them, the system came to life. Because it is using tin plated pins on the H8 bus, the system is unstable and it resets itself at random as expected on such environment. By replacing the H8 bus pins with new ones that should fix the system and it is going to take longggg hrs to do.
Hopefully I can use such system to read all the tape cassettes that I have for archiving purposes.
Norberto
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Saturday, May 18, 2013 10:11 AM
To: se...@googlegroups.com
Subject: [sebhc] H8 System
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Les Bird
Received the H8 system well packed and I will document its progress in my website as I rebuild the system. Below are some pictures as I unpacked the H8 system. It was hard to take the boards out and after reseating them, the system came to life. Because it is using tin plated pins on the H8 bus, the system is unstable and it resets itself at random as expected on such environment. By replacing the H8 bus pins with new ones that should fix the system and it is going to take longggg hrs to do.
Hopefully I can use such system to read all the tape cassettes that I have for archiving purposes.
Norberto
<image021.jpg>
<image022.jpg>
<image023.jpg>
<image024.jpg>
<image025.jpg>
<image026.jpg>
<image027.jpg>
<image028.jpg>
<image029.jpg>
<image030.jpg>
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Saturday, May 18, 2013 10:11 AM
To: se...@googlegroups.com
Subject: [sebhc] H8 System
Saw this H8 system for $275.00 and couldn’t resist to buy it. I will like to transform this one to use the PC power supply, now that I’m almost done with my Ultimate H8 system.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=380643768190#ht_4492wt_1397
Norberto
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Norberto Collado
I found one of the regulator connector to missed the ground pin, which bend down and went underneath the connector. I wonder if it ever worked like that at least for some time. I took the system into pieces because of loose screws inside the H8 chassis. I’m in the process of cleaning the H8 chassis and remove the rust. It seems that the system was built with the parts shown in the picture and then stored.
Norberto
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Les Bird
Sent: Saturday, May 25, 2013 6:22 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
Norberto,
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/B5F40676-5C2F-40FD-BC2E-AEDFABACFA5F%40bellsouth.net?hl=en-US.
Norberto Collado
Glad that I took the whole system apart. Found screws and metallic items inside the housing of the speaker and in the power switch. Also found that the power cables attached to the capacitor were loose; not soldered properly.
On the backplane Diode D4 came out by itself while de-soldering the H8 bus pins. Also the power ground wire is loose were it connects to the H8 backplane. See photos below.
Removing the 25 pin connector from the H8 was easy because they were not soldered properly. I will add the golden pins instead to have a reliable backplane.
Not sure how this system worked with loose power cables and pins not soldered properly on the H8 backplane. I imagine the frustration in using the system. I can tell that the power supply and the backplane was put together in a rush to for the excitement of seem the system working. On the front panel the time was spend to put it together properly.
Norberto
Loose power cable (GND)
D4 came out by itself.
Replacing H8 pins with golden pins. The original pins came out easily.
Glenn Roberts
Sent from my iPad
Glad that I took the whole system apart. Found screws and metallic items inside the housing of the speaker and in the power switch. Also found that the power cables attached to the capacitor were loose; not soldered properly.
On the backplane Diode D4 came out by itself while de-soldering the H8 bus pins. Also the power ground wire is loose were it connects to the H8 backplane. See photos below.
Removing the 25 pin connector from the H8 was easy because they were not soldered properly. I will add the golden pins instead to have a reliable backplane.
Not sure how this system worked with loose power cables and pins not soldered properly on the H8 backplane. I imagine the frustration in using the system. I can tell that the power supply and the backplane was put together in a rush to for the excitement of seem the system working. On the front panel the time was spend to put it together properly.
Norberto
Loose power cable (GND)
<image002.jpg>
D4 came out by itself.
<image004.jpg>
Replacing H8 pins with golden pins. The original pins came out easily.
<image006.jpg>
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Norberto Collado
Soldered the new gold pins, diode and cable, and with alcohol cleaned side two to remove the flux material left when it was put together the first time.
The board is ready to go back to the H8 system.
Pictures below;
Cables soldered properly
Soldered the new gold pins and the diode. Ready to go back into the H8 system.
Golden pins.
Side 2: Removed all the flux with alcohol
Norberto Collado
On the original H8 backplane is easy because the holes are not plated. On Les’ H8 board the holes are plated so they are hard to remove if a mistake is made.
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Glenn Roberts
Sent: Sunday, May 26, 2013 6:00 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
Wow, how did you get the backplane pins out so quickly? I was picturing a huge job. I think I need some desoldering pointers
Sent from my iPad
Glenn Roberts
Sent from my iPad
Soldered the new gold pins, diode and cable, and with alcohol cleaned side two to remove the flux material left when it was put together the first time.
The board is ready to go back to the H8 system.
Pictures below;
Cables soldered properly
<image001.jpg>
Soldered the new gold pins and the diode. Ready to go back into the H8 system.<image002.jpg>
Golden pins.<image003.jpg>
Side 2: Removed all the flux with alcohol
<image004.jpg>
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Norberto Collado
The system is all assembled and ready for cassette duplication. During the assembly process, the cable connected to the high current diodes came out. Re-solder both wires to have a good connection. Based on this experience, it is better to disassembled when buying an H8 to check for bad solder joints or loose wires. It will avoid debugging time and frustration. The system is solid as a rock; no more resets at random. I need to create the cable to connect to the H19 monitor to see if I can read the tapes to create a copy. Once done with the tapes, the plan is to put it back on eBay as a working and functional system. Not sure if I should add the H17 controller and H8-4 or keep it as it is.
Overall I ended with spares screws that were loose inside the chassis.
Here are the final stages;
Cable came out from the high current diode. Re-solder both cables to have a good connection.
Putting it together;
Using Les’ 64K RAM board for tape duplication.
Les Bird
The system is all assembled and ready for cassette duplication. During the assembly process, the cable connected to the high current diodes came out. Re-solder both wires to have a good connection. Based on this experience, it is better to disassembled when buying an H8 to check for bad solder joints or loose wires. It will avoid debugging time and frustration. The system is solid as a rock; no more resets at random. I need to create the cable to connect to the H19 monitor to see if I can read the tapes to create a copy. Once done with the tapes, the plan is to put it back on eBay as a working and functional system. Not sure if I should add the H17 controller and H8-4 or keep it as it is.
Overall I ended with spares screws that were loose inside the chassis.
Here are the final stages;
Cable came out from the high current diode. Re-solder both cables to have a good connection.
<image006.jpg>
Putting it together;
<image008.jpg>
<image010.jpg>
Using Les’ 64K RAM board for tape duplication.
<image012.jpg>
<image014.jpg>
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Norberto Collado
Hmmm, I forgot about the non-org0 feature. Technically it should not work. Let me put back the 8K RAM just to play safe. It will be nice to add a jumper to select between org0 and non-org0.
Norberto
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Les Bird
Sent: Monday, May 27, 2013 3:03 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
Hey Norberto, how'd you get my 64k card to work in a non-org0 system?
- Les
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/29B8C558-DE61-4886-93C8-FD96E38E28D2%40bellsouth.net?hl=en-US.
Les Bird
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/000601ce5b32%245aa46a20%240fed3e60%24%40koyado.com?hl=en-US.
Norberto Collado
Do you have the board schematic or any handmade schematics? Because you have one big RAM IC it needs more decoding. You will need to decode /A13-/A15 through a 74LS138 and use a DIP switch to select in increments of 8K. The 8 lines output will be decode by a 74LS30 and pin 8 will be used to select /CS and to enable the /MEMR and /MEMW logic.
/A15-/A3 -> 74LS138 ->8DIP switch->74LS30-> /CS…
When SW1 = ON = 8K
SW2 = ON = 16K
SW3 = ON = 24K
SW4 = ON = 32K
SW5 = ON = 40K
SW6 = ON = 48K
SW7 = ON = 56K
SW8 = ON = 64K
BUT the easy way is as follows;
Add a 74LS682 to decode from /A13 to /A15 and the output is your RAM /CS. You will need to add a 8pin DIP switch to select in 8K increments. Just one IC and one DIP switch should do the job. If you have the schematic of the board, then I can make the changes to my board to enable it to do both non-org0/org0 addressing. You can use the same circuit that I have for the H8-USB (U1 & SW1) and wired P7 to /A15, P6 to /A14 and P5 to /A13. Wire from P4 to P0 to VCC (not to GND as shown). Wire SW1 as shown in the schematics. Leave pin 1 unconnected, and do not add RP2. Pin19 is your /CS for your RAM and to enable the /MEMRD & /MEMW logic. This should work!
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/915DB772-E915-481C-8776-4390256B20E6%40bellsouth.net?hl=en-US.
Norberto Collado
Norberto Collado
Hello Les,
Here is the schematic for a possible mod to your board to enable RAM selection in 8K boundaries. I did a quick schematic and it might contain logical errors. I think we have enough space to add such IC’s on your board to check out the circuit. Also I was thinking in connecting A16 to the H8-Speed board (D2-RL) to enable the second 64K. Also it would be nice to add battery backup as well.
Norberto
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Monday, May 27, 2013 6:48 PM
To: se...@googlegroups.com
Subject: RE: [sebhc] H8 System
After a second review on the 74LS682 idea, I found that is not viable. It will select only 8K and not beyond that. The 74LS138 and the 74LS30 along with eth DIP switch is the way to go as discussed below.
Norberto Collado
Updated schematic!
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Monday, May 27, 2013 11:05 PM
To: se...@googlegroups.com
Subject: RE: [sebhc] H8 System
Hello Les,
Norberto Collado
Les, any updates?
From: Norberto Collado [mailto:norberto...@koyado.com]
Sent: Sunday, May 19, 2013 9:52 AM
To: 'se...@googlegroups.com'
Subject: RE: [sebhc] H8 System
Les,
We need to enable U305 (TL7705A) Voltage supervisor to provide the proper reset signal to the CPU and the H8 bus based on my experience with the RTC circuitry. We will need to add a three pin header that will connect the output of the TL7705 to drive the CPU, BUS reset signal or to keep current capabilities if not planning to use the TL7705. Below is a proposal and please check the logic level to be correct!
Les Bird
<image001.png>
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Norberto Collado
-------- Original Message --------
Subject: Re: [sebhc] H8 System
Norberto Collado
Below is the H8 that I acquired recently in eBay which I restored with the intention to read/backup the cassettes tapes that I have. Due to time constraints I won’t be using this system for the intended purposed so I decided to offer it at this group for the amount of $360.00 which includes shipping. It is an original H8 with the 8080A CPU, 8K of RAM and the cassette interface. Also I will include all the cassettes tapes that I acquired over the past years.
Let me know if anyone is interested before I put it on eBay.
Thanks,
Norberto
Mark Garlanger
Mark
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Norberto Collado
No charge for the cassettes that I have, except for shipping. What we want is someone to rescue its contents and create backups for future usage.
The cassettes will “not” be listed in EBay, just the H8.
Norberto
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Mark Garlanger
Sent: Sunday, June 09, 2013 2:24 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
Hey Norberto,
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/CAAjkm7_2E%3Dm3Pct37%2B4QR9VxRo-Zmha9gzVCA0n0V%3DObcP3ypQ%40mail.gmail.com?hl=en-US.
Mark Garlanger
side 1:
Editor V2.0, Assembler V2.0
880-51
880-52
side 2:
Hangman, Craps, Nim, Hexapawn, Tic-Tac-Toe, Orbit, Hamrabi, Derby
880-62
------
885-1009
?
885-1057
?
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/007601ce6559%24011cc340%24035649c0%24%40koyado.com?hl=en-US.
Glenn Roberts
Very nice system and a bargain at that price compared to what people pay on eBay (often for junk) – nice to know you’ve brought it up to spec. hope it finds a home in the group – I probably can’t justify another H8 in the house!
- Glenn
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Sunday, June 09, 2013 5:17 PM
To: se...@googlegroups.com
Subject: RE: [sebhc] H8 System
Below is the H8 that I acquired recently in eBay which I restored with the intention to read/backup the cassettes tapes that I have. Due to time constraints I won’t be using this system for the intended purposed so I decided to offer it at this group for the amount of $360.00 which includes shipping. It is an original H8 with the 8080A CPU, 8K of RAM and the cassette interface. Also I will include all the cassettes tapes that I acquired over the past years.
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geneb
> intention to read/backup the cassettes tapes that I have. Due to time
> constraints I won't be using this system for the intended purposed so I
> decided to offer it at this group for the amount of $360.00 which includes
> shipping. It is an original H8 with the 8080A CPU, 8K of RAM and the
> cassette interface. Also I will include all the cassettes tapes that I
> acquired over the past years.
>
>
close enough to my place that you'd be welcome to come by and inspect
them. One works, one has an issue (not sure what) and both have disk
systems.
g.
--
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http://www.f15sim.com - The only one of its kind.
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Some people collect things for a hobby. Geeks collect hobbies.
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://www.scarletdme.org - Get it _today_!
Marc-Andre Handfield
To: se...@googlegroups.com
Sent: Sunday, June 9, 2013 5:17:12 PM
Subject: RE: [sebhc] H8 System
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Jack Rubin
Welcome to SEBHC!
Jack
> -----Original Message-----
> From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf
> Sent: Sunday, June 09, 2013 7:58 PM
> To: se...@googlegroups.com
> Subject: Re: [sebhc] H8 System
>
> > Below is the H8 that I acquired recently in eBay which I restored with the It
> Also I will include all the cassettes tapes that I acquired over the past years.
>
>
>
> I will take you up on your offer. Lee Hart sent me the link to this group
> knowing I've been looking for an H8 to add to my collection. I've been into old
> computers for a while but only recently decided to work on my collection. I've
> focused my collection around the computers featured in Popular & Radio
> Electronics 1970's and the H8 is on my Wish List. It keeps coming up in several
> issues.
>
> I will happily work on recovering the cassettes and will freely release anything
> I recover from them.
>
> Cheers,
> :)Josh
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Dave McGuire
Seconded! Good to see you here, Josh.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
Norberto Collado
JBensadon
:)J
Glenn Roberts
Wow, how could you part with the Ultimate?!
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Monday, June 10, 2013 8:43 PM
To: se...@googlegroups.com
Subject: RE: [sebhc] H8 System
Hello Josh,
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/20130610174310.1321cca37f09b4ab87c5049afdc8ceaa.bab4ec0346.wbe%40email09.secureserver.net?hl=en-US.
Norberto Collado
-------- Original Message --------
Subject: RE: [sebhc] H8 System
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/000f01ce668f%24d51d8080%247f588180%24%40gmail.com?hl=en-US.
Norberto Collado
Also if I can get the H89 on the Vero-board working, then I can put this board in a small case and replace the H8 and the H89’s that I have, and still do the same and or more. I will need to keep the H19 until I get a working solution to replace it.
Also this board could be used for educational purposes if any interest.
Norberto
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Norberto Collado
Sent: Tuesday, June 11, 2013 6:52 PM
To: se...@googlegroups.com
Subject: RE: [sebhc] H8 System
Very hard to let it go after putting my heart into it!
Glenn Roberts
I can offer a similar deal to the group. I have at least one extra H8 in my inventory.
Unfortunately there was a car accident the night before last… it took out a power pole… during a huge storm … which meant we lost power…. For 8 hours…. Which meant our sump pumps stopped (until I could get emergency power going)… which meant our basement got wet… which means we’re having to do repairs down there (nothing valuable from the heathkit collection got wet though!) – pretty torn up!
Once I get re-established down there I’ll post info on the system…
- Glenn
From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of JBensadon
Sent: Monday, June 10, 2013 11:33 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] H8 System
> The system is already sold to Rudolf_Brandstötter.
No worries, these systems come up frequently on EBay. Just a matter of waiting for a fair price.
:)J
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JBensadon
What do you have and how much do you want for it?
Thanks,
Josh