[sebhc] My H8 Systems

Dwight K. Elvey dwight.elvey at amd.com
Mon May 24 22:04:03 CDT 2004


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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