Quote Originally Posted by glitch View Post
The JAIR8080 is an excellent option, especially since you won't have to modify your system at all.

I've put together some custom boards to keep rev 0 machines in as-is states in the past: usually wire wrap or point-to-point wired, with 32K RAM, some amount of ROM, and a serial port that implements one channel of the 88-2SIO. I've never laid it out as an actual circuit board though; I probably should at some point.
I'm about to start working on a board to go with my Altair with 1/4 of an 88-4PIO and an 88-ACR compatible modem section, since my chassis came with cabling for the both of those but not the cards. I have a hard time keeping wire wrapped and point to point boards neat and tidy enough so I'm going to go ahead and get PCBs made.

Perhaps instead I should do:
-1/4 of a 4PIO
-88-ACR compatible modem (still researching different ways to implement the modem)
-1/2 of an 88-2SIO
-32-64KB of RAM and 16K ROM

This could be used to either provide 'MITS Compatible' I/O to a JAIR board (leaving the RAM and ROM unpopulated), or on its own with a MITS 8080 board as a 2-board solution.