Nonpareil status

[brouhaha]

(10-16-2022 10:15 PM)teenix Wrote:  CRC 100 from what I determined...

Read Mode: is buffer full? Status[3] = 1 if so
Write Mode: Is buffer empty? Status[3] = 1 if so

That's what we meant by "buffer ready", but it's definitely good to document it more explicity.

Quote:I could be wrong, but it also seems to test the head switch state.
Head Switch Closed - Status[3] = 1

It was the only way I could get my code to work properly with the HP microcode.

You found that the 0100 instruction senses that too? Jacques and I didn't find anything like that. Nonpareil seems to support the card reader just fine with 0100 only sensing buffer ready in the way you described.

Maybe the flag doesn't go true unless both the head switch is closed and the buffer is ready?