H8-Z5-4 – Cassette Tape
H8-H67-Z67-IDE Hard Drive
H8/H89-Z67-SDC Hard Drive
Thanks,
Norberto
I do not think the relay are solid state. Here is the one I purchased.
I just calibrated the board. I order two different PLL Clock Synthesizer and one work nicely. The other couldn’t reach the 2.4KHz signal. I think it might need some resistor tweaking.
This one worked fine: (As I’m using 1% resistors and 1% cap for the VCO, the output frequency is very stable.)
https://www.jameco.com/z/CD4046B-Major-Brands-IC-CD4046-MICROPOWER-PHASE-LOCK-LOOP_13012.html
This one did not reach the desired frequency. It will required resistors tunning.
The cassette read & write circuit are working fine per scope. Next steps to add the 82C51 and test with the real cassette system. The check the H8T circuit and last the 82C51 workaround circuit.
Latest picture attached.
Thanks,
Norbert
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Glenn,
Test completed:
Test Pending:
The only issue with the layout was the Audio Dual jack, that I forgot to tell them to do square holes and not round holes. I updated the library to only use square holes. Anyhow, adding the Audio jack is optional.
Everything else so far checks out. Latest picture downloading files thru H8T interface. All LED’s on… 😊
Thanks,
Norberto
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On Aug 1, 2022, at 1:46 AM, norberto.collado koyado.com <norberto...@koyado.com> wrote:
From this list:
The only two boards that I have on my list are;
I think I have the H8-2 (parallel i/o for h10) board, but will need to check.
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I have the manual (595-2467-01), schematic and, most importantly, illustration book for the H47, though I have no actual device (nor have I ever even seen one 😊 ).
The illustration book has several pictorials that appear to lay out the command bytes. There’s also a “programmer’s guide” section in the manual that describes the I/O transaction sequences and more.
Norberto: would you like me to send this to you?
I could also probably scan the appropriate pages if that’s easier. Scanning everything might be some work but I could put it in the queue…
From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of norberto.collado koyado.com
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As I recall, the "external" H47 cabinet contained a
fairly-sophisticated controller - along the lines of the SASI
controllers. I believe it was from a source that did not last very
long, since 8" floppy use was fading at the time and the use of
non-standard 8" drives was limiting/annoying. And, it was an
expensive device. Heath's choice of the H47 as their 8" floppy
solution was the motivation for Magnolia Microsystems to create
their soft-sector 8"/5" floppy controller - a much cheaper
solution.
What's the goal in resurrecting the H47? Was there some software that required an H47? Do we have a cache of 8" floppies? We could probably reverse-engineer something close to the original protocol by examining the various ROMs, drivers, and bootstraps, but without actual 8" drives and floppies I'm wondering what the appeal is?
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On Aug 1, 2022, at 5:36 PM, norberto.collado koyado.com <norberto...@koyado.com> wrote:
Glenn,
I agree with Douglas assessment. As I like storage devices, I will be interested in getting a copy of the “programmer’s guide”. This should help me understand how to write and read a sector to an H47 device.
Duplicating the board HW is easy as there was an H89 version which is much simpler and elegant. Attaching a device to the H47 board will be something like the Z67-IDE+, but at a reduced capacity as the 8" floppies had a 1.2MB capacity x2. So, it is not a viable option.
I wonder in this group has a working H47 with the original drives?
We get more with Rick solution for HDOS and eventually CP/M: http://koyado.com/heathkit/New-H8-Website/download/h8-dual-f-storage-side1-view.png
From: se...@googlegroups.com <se...@googlegroups.com> on behalf of Douglas Miller <durga...@gmail.com>
Sent: Monday, August 1, 2022 2:19 PM
To: se...@googlegroups.com <se...@googlegroups.com>
Subject: Re: [sebhc] New boards in development!
As I recall, the "external" H47 cabinet contained a fairly-sophisticated controller - along the lines of the SASI controllers. I believe it was from a source that did not last very long, since 8" floppy use was fading at the time and the use of non-standard 8" drives was limiting/annoying. And, it was an expensive device. Heath's choice of the H47 as their 8" floppy solution was the motivation for Magnolia Microsystems to create their soft-sector 8"/5" floppy controller - a much cheaper solution.
What's the goal in resurrecting the H47? Was there some software that required an H47? Do we have a cache of 8" floppies? We could probably reverse-engineer something close to the original protocol by examining the various ROMs, drivers, and bootstraps, but without actual 8" drives and floppies I'm wondering what the appeal is?
On 8/1/22 15:33, glenn.f...@gmail.com wrote:
I have the manual (595-2467-01), schematic and, most importantly, illustration book for the H47, though I have no actual device (nor have I ever even seen one 😊 ).
The illustration book has several pictorials that appear to lay out the command bytes. There’s also a “programmer’s guide” section in the manual that describes the I/O transaction sequences and more.
Norberto: would you like me to send this to you?
I could also probably scan the appropriate pages if that’s easier. Scanning everything might be some work but I could put it in the queue…
- Glenn
From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of norberto.collado koyado.com
Sent: Monday, August 01, 2022 3:42 PM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] New boards in development!
For the H47, what I'm missing is the signals protocol to talk to the drive controller. I have the schematics, but no specs on how to drive the bus protocol. I need something similar to SASI specs published by Heath for the H47 interface.
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Just to be precise, the H47 board that plugs into the H8 is an *interface* board, not a controller. It is a fairly simple circuit, similar in complexity to that used for the H67 interface (i.e. a custom parallel port). The external box with the 8" drives contains the controller, which has a CPU and FDC chip and associated hardware and firmware. The external H47 cabinet is not simply a container for 8" drives.
In the absence of a working H47 controller, one would need working 8" floppy drives and a new controller (with floppy interface) programmed to emulate the H47 protocol. I think the actual designer/manufacturer of the "H47" controller was Remex, but that probably doesn't help.
If you're just looking for data transfer, there may be better
ways. There are also other ways to get 8" floppy drives onto an H8
- one of which would be to replicate the Magnolia Microsystems H89
board onto an H8 format.
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An H8-H37 can be modified to talk to 8” floppies. It needs the breakout board to convert from 34 pin to 50 pin. I might have some in my toolbox.
Norberto
From: se...@googlegroups.com <se...@googlegroups.com>
On Behalf Of Peter Higgins
Sent: Monday, August 1, 2022 9:49 PM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] New boards in development!
Yes, I do realize the H47 board for the H8 was simply an interface, and that the H47 external enclosure has all the circuitry required to control the drive and read/write data to and from the drive. Replicating all that circuitry (ie the floppy controller and a microprocessor) on an H8 board so that standard Shugart-interface 8" drives can be connected would be a significant project. As I mentioned before, it is unlikely there are enough of us interested in using 8" drives on the H8 to make it worth the design effort involved.
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Thanks Glenn!
The new H8-Z5-4 loaded the original H8 tapes. This is a great achievement. Also, it read tapes created with your H8-5 boards.
Next step is to create my own tapes and be able to read them…
Norberto
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I think a modified H37 could be used to do single-density 8"
diskettes. DD 8" would be more of a challenge, especially at the
original 2MHz CPU speed.
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Norberto has designed support for 8” drives into his H8-Z37 board design, so if you have one of his new controllers you should be able to do this. I’m sure he can weigh in on any questions.
From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Peter Higgins
Sent: Tuesday, August 02, 2022 11:47 AM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] New boards in development!
Excellent point. Also, I expect the H37 controller will not be able to support the data rate of 8" DD which is twice that of 5.25" DD.
On Tuesday, August 2, 2022 at 8:17:34 AM UTC-7 Douglas Miller wrote:
I think a modified H37 could be used to do single-density 8" diskettes. DD 8" would be more of a challenge, especially at the original 2MHz CPU speed.
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I think a modified H37 could be used to do single-density 8" diskettes. DD 8" would be more of a challenge, especially at the original 2MHz CPU speed.
....but won't be able to get it out anytime soon, due to fractures in my back from a rollover accident.Mark
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WOW! Please take care of yourself!
Norberto
From: se...@googlegroups.com <se...@googlegroups.com>
On Behalf Of Mark Garlanger
Sent: Tuesday, August 2, 2022 8:28 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] New boards in development!
Thanks John, it was kinda crazy going from driving down the road at about 50 mph, to immediately rolling three times and having the car stop with the driver side on the ground. Luckily, I always wear my seatbelt, or it could have been much worse.
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IMO not necessary given that we have Z80 boards. For historical correctness we can use original 8080 boards to demonstrate early systems…
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Couldn't a CPLD replace both?
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Thank you for the link. Unicorn is less expensive. So, we can reproduce original board with such parts + the new improvements.
I’m just brainstorming here:
Norberto
From: se...@googlegroups.com <se...@googlegroups.com>
On Behalf Of Peter Higgins
Sent: Wednesday, August 3, 2022 5:43 PM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] New boards in development!
Re reproducing the 8080 CPU board...
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Is there a demand for more than 64K on an 8080? Note that MMS CP/M 3 is written for a Z80 (H89) and would require a major rewrite to work on 8080. Even the current MP/M-II I have is written for the Z80.
But, if you're going to add an MMU to the 8080 CPU board, I'd recommend trying to make it software compatible with the H8-512K-MMU. Otherwise, it's just more obscure hardware that people need to be convinced to port software to.
My two cents.
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Does PAM-37 have Z80 code? I know it preserves Z80 registers, but
not sure how well guarded that code is (does it auto-detect an
8080?)
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On Aug 4, 2022, at 3:38 PM, norberto.collado koyado.com <norberto...@koyado.com> wrote:
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Thank you for the information. Josh design uses a 39pF cap and I will follow his BOM: Digi-Key, CAP CER 39PF 100V NP0 RADIAL. At least now I have a BOM before starting.
Thank you,
Norberto
From:
se...@googlegroups.com <se...@googlegroups.com> on behalf of Peter Higgins <higgin...@gmail.com>
Date: Thursday, August 4, 2022 at 6:43 PM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] New boards in development!
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