MITS 8800B CPU Board

[Dwight K. Elvey]

>From: "river" <river at zip.com.au>
>
>Hi,
>
>Thanks for your replies. I found the relevant information.
>
>I have an extensive inventory and can source the parts and get this poor, 
battered board back to its old self again. However, looking through the doco I 
noticed that the 8800B requires a display/control and interface boards. A 
question for those of you that own a MITS8800 - does it need those boards for a 
turnkey system? Can I plug the CPU board into the backplane and run it without 
the d/c and i/f cards, assuming I set up the ROM and RAM cards for the system? 
If not, (since I do not have the d/c and i/f cards) I'll have to try and build 
them from the cct diagrams I have obtained. This is do-able (but a lot of work) 
if I can get my hands on some blank S100 w/wrap boards, but I noticed there's a 
1702 EPROM chip and I'd need to get the memory map for this chip to burn my own.
>
>Failing that, and it's all too hard and bothersome for me, is there anyone that 
would need a repaired 8800 CPU card for trade or anything similar?
>
>rgds
>river
>

Hi
 It should work on a turnkey. Almost everything goes
through the S100 bus. Only the direct connect of the
data bus goes directly between the panel and the CPU board.
I don't think that is needed. You will have to have code
residing at address 0000. This is not common. Most
expected a working front panel that could load a boot
address.
 Some ROM boards have a way to be at 0000 after reset
and then switch to someplace else once things are booted.
 Don't give up on it. When there is a will, there will
be a way.
Dwight