Hi,
I had been here before, I can't figure out why the code isnt working.
mov eax,101
mov ebx,port
mov ecx,3
mov edx,port
int 80h
You really should check the return value here. I imagine the call is
failing. In particular, you need to have root access, and I believe that edx
should actually be 1.
If you're just hoping to control a device you've connected to your parallel
port, you might try designing it so that it can work just from the output byte
bits, on pins 2 through 9, if that's possible with what you are doing. You'll
have to connect pin 11 to 23 and 12 to 24 so that the busy and out of paper
signals go away, otherwise the lp driver will block your process on writes
thinking the printer is busy or out of paper. Then whatever byte you write to
the lp driver will stay on those pins until you write another.
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