[sebhc] Schematics and board layouts
Bill Beech (NJ7P)
nj7p at nj7p.org
Sat May 19 21:05:34 CDT 2007
Carrol,
I certainly will. I have an S-100 system and Kaypros that are
operational, after some TLC. I had to rewrite the code for the S-100
boot rom to get it working reliably. It had a bug that drove my wife
nuts 20 years ago with a Z80 assembler class she was taking. It had
been 20 years since I did much 8085 assembler. And I had to recompile
my old command line assembler to do it.
This old stuff is fun and is far less complicated that a current
generation PC.
Bill
Carroll Waddell wrote:
> Bill Beech (NJ7P) wrote:
>
>> Carrol,
>>
>> Great! My address is:
>>
>> William Beech
>> 6567 Y-Lightning Rd.
>> Hereford, AZ 85615
>>
>> I bet the 32K board is a 64K with half the 4116's missing! I will
>> copy the manual and put it up on the site.
>>
>> I have an H8-4 serial I/O card and a controller marked "Controller
>> Board" and number 85-2204-1. It has a Intel 2316 ROM and what
>> appears to be an AMI S2350 ACIA - so I bet this is the hard-sectored
>> controller. Also an 85-2521-1 board (about 2 inches long) which I
>> believe handled double-sided drives.
>>
>> I appreciate the offer of help. I will be communicating my progress
>> once I get the schematics.
>> Thanks again!
>>
>> Bill
>>
>>
>>
>> Carroll Waddell wrote:
>>
>>> Bill Beech (NJ7P) wrote:
>>>
>>>> Does anyone have the foldouts for the CPU, RAM, Disk Controller(s)
>>>> and other boards used in the H8 that would be willing to mail them
>>>> to me to scan in and share with the group? I will return them once
>>>> they are scanned.
>>>>
>>>> I am deadlocked trying to fix an H8 here without the schematic for
>>>> the CPU card.
>>>>
>>>> Also, does anyone have a manual on the "DG-64D 64K Memory Board"
>>>> for the H8. This H8 has only that third-party dynamic RAM board.
>>>>
>>>> Thanks!
>>>>
>>>> Bill
>>>>
>>>> --
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>>>>
>>> Bill
>>> Send me your address and I'll let you borrow a schematic of the CPU
>>> board. I have some copies that I have reduced down to 11 x 17 of the
>>> CPU and H17 controller schematics.
>>> I have a book on the DG 32K board if you think that would help. If
>>> you need any help repairing your H8, let me know and I'll try to help.
>>>
>>> carrollwaddell at sc.rr.com
>>>
>>> Carroll
>>> --
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>>>
>>>
>>
>> --
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>>
> I'll get the stuff I have in the mail on Monday. The small board is
> probably called an XCON 8 Boot board. It is usually turned with the
> components toward the back and plugged into the last bus connector. It
> was used to allow all 64K to be RAM. This was necessary to run CP/M.
> The board with the 2350 is the hard sectored disk controller.
> Let me know if you need anything else.
> Carroll
> --
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>
>
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