Hi, I am the excited new owner of my dream machine. Brought up with a variac, and everything works as expected, except for the examine/next and deposit/next switches (when halted) They do work electrically. Single step does work. It looks like the mod has been performed to allow it to work properly with non-IMSAI RAM boards. Simple troubleshooting steps have already been performed, such as reseating loose IC’s. Before I start hunting with the logic tester, any likely suspects that could prevent both from working? Looking at the schematic, I was hoping that u14 or u13 could be the problem. They appear to be functioning properly.
Includes the following boards:
TDL ZPU z80 board
CCS Disk Controller
Solid State Music Rom board
Processor Technology 3P+S I/O serial & parallel interface card
COEX 64K Static RAM board.
The problem still exists when only the front panel and z80 board are in place.
Includes the following boards:
TDL ZPU z80 board
CCS Disk Controller
Solid State Music Rom board
Processor Technology 3P+S I/O serial & parallel interface card
COEX 64K Static RAM board.
The problem still exists when only the front panel and z80 board are in place.