[sebhc] My H8 Systems

Dwight K. Elvey dwight.elvey at amd.com
Tue May 25 14:36:45 CDT 2004


Hi Carroll
 I was just looking at the pdf for the HA-8-6 Z80. It describes
using the controller card without the ROM and the modifications
needed. It says that this allows the use of CP/M with this
setup since the ROM's are copied to RAM and then run from RAM.
It mentions that it only works with 2.0 HDOS and above.
 Anyway, take a look at the pdf from the web site.
Dwight


>From: "Carroll Waddell" <CarrollWaddell at sc.rr.com>
>
>Dwight,
>Thanks for this information. I purchased an H17 controller board, but 
>the ROM and RAM chips are missing. Perhaps I won't need them to use it.
>Carroll
>
>Dwight K. Elvey wrote:
>
>>Hi
>> With all of the talk about H8's I decided this weekend
>>to actually power one up( I do have a working H89 ). I have two
>>of the H8's. One is the older type with the 8080 and the
>>other is the newer type with the Z80. I only brought up the
>>Z80 one. I used my variac and brought the voltage up slowly over
>>about 1 hour time. At first it was flakey. I removed the first
>>RAM card and switched the next to start at address 0. It then
>>booted fine. I gave the card a quick ohm meter check and there
>>didn't seem to be any issues with it. I reconfigured the
>>addresses back to the original and it was then working. It boots
>>to the monitor just fine.
>> I guess the connector needed a little wiping action.
>>I've not done much in the way of a RAM test yet. I'll most
>>likely write a 13n march for it. It has a H17 controller
>>so I can try booting a disk. I should note that the controller
>>has both the ROM and the two RAMs missing. I suspect that this
>>is what one does when there is the XCOM8 with a full 64K of RAM.
>> I have another controller board with the RAM and ROM. I expect
>>to run this on the 8080 machine. This box doesn't have a full complement
>>of RAM. It has only 4 8K boards installed but I have 3 other
>>8K boards ( one not fully populated ). The 8080 has the
>>combination cassette/serial board ( H8-5 ) while the Z80 machine
>>has the 4 port serial board ( H8-4 ).
>> I only have the one H17 drive box so I'll need to share that between
>>machines. I have a H19 but I'm not sure what its status is yet.
>> All good fun.
>>Dwight
>>
>>
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