I've ran into an odd issue with IDE card.
The card has been fully built out.
Without the CF adapters installed the boards as expected. I'm able to write to all 6 TIL311's correctly; probing around the board everything looks as I would expect; the drive flip flop works etc.
When I plug in a CF adapter the ID0..ID4 signals are pulled to VSS (8255 Port A PA0..PA3 pins, CF adapters pins 11,13,15,17 ). It's definitely the CF adapter pulling the 4 pins low. I have 3 CF adapters, all three do this; both CF positions on the PCB result in the issue.
I've swapped put the 8255 and the 74LS244s (U12 and 14). At this point I'm lost.
-Neil