You really did name this one well on the board Exxos - BAD DMA.
I have just tried part of rpineau suggestions where I took out DRQ as that was made easy by the U51 chip. That still did not recognise drives.
About to also try your suggestions Exxos
You really did name this one well on the board Exxos - BAD DMA.
Yea, I see the 74ls74 to delay the 74ls245 /G pin by 1 clock cycle after /FDCS goes hi could be the solution.
Yep. I did jumper those buffers once and didn't see any difference... But my guess is Atari knew of the problem on stfm and added buffers on ste... But also note the route hdcs via delay as well...
Damn... Well we solved a problem nobody has had yet anyway :p
Interesting thought..
I did think that too. Reason for my slow going last night is that I was going methodically through all the connections checking again for bad solder and making sure everything was connected correctly. Including going over the socket with more solder.