litterbox99
Experienced Member
- Joined
- Aug 8, 2010
- Messages
- 103
Hi all !
I recently acquired an Imsai 8080 machine and I'm
looking to get it up and running.
It came with only a CPU board 8080 rev-4 and a Expandoram II
memory board. I also picked up a Microbyte 32k board from ebay.
I'm not sure if either one of these boards are compatible with the 8080.
I know from the docs I read about the Expandoram it mentioned z80 so
maybe it wont work with my system (bought as-is)
The problem I'm having is that I can't deposit to memory and
examine it back, the data LED's are all high no matter what I do.
So I'm wondering if its a memory issue or something else. I've verified
voltages and sniffed around with a logic probe (thinking a bad IC
on the front panel pulling the data bits high)
To sum it up, since the CPU board doesn't have any memory, I guess
I need to know if the memory boards I have are compatible. Maybe
there both bad. I don't want to chase my tail, been doing that for a week
already ;-)
Anyone have a suggestion or perhaps a static ram board for sale
so I can continue debugging this machine.
I also posted to the s100computers forum with a bit more
detail earlier in the week.
Todd
I recently acquired an Imsai 8080 machine and I'm
looking to get it up and running.
It came with only a CPU board 8080 rev-4 and a Expandoram II
memory board. I also picked up a Microbyte 32k board from ebay.
I'm not sure if either one of these boards are compatible with the 8080.
I know from the docs I read about the Expandoram it mentioned z80 so
maybe it wont work with my system (bought as-is)
The problem I'm having is that I can't deposit to memory and
examine it back, the data LED's are all high no matter what I do.
So I'm wondering if its a memory issue or something else. I've verified
voltages and sniffed around with a logic probe (thinking a bad IC
on the front panel pulling the data bits high)
To sum it up, since the CPU board doesn't have any memory, I guess
I need to know if the memory boards I have are compatible. Maybe
there both bad. I don't want to chase my tail, been doing that for a week
already ;-)
Anyone have a suggestion or perhaps a static ram board for sale
so I can continue debugging this machine.
I also posted to the s100computers forum with a bit more
detail earlier in the week.
Todd