🚀 go-pugleaf

Fellow bit-twiddlers,

I'd like to thank everyone who replied to my post, both on the net
and via e-mail.  The information was most helpful.

I solved my problem.  I am using IRQ5.  The reason it didn't work 
when I tried it before is that the interface I built is now connected
to a new synthesizer which sends periodic "active sensing" bytes.
My interface received these and set the INT bit.  By ignoring these
sense bytes in my interface code, I was never clearing the INT bit,
which caused subsequent bytes to generate overrun errors, etc.  

I inserted code to read these sense bytes, acknowledge them, and keep
the input channel clear.  This fixed it!!!!

FYI, I have discovered AT-class machines pretty much use IRQ interrupts
for whatever reason they want -- there is no real "standard".  Some use
IRQ5 for the floppy drive, some for LPT2, some for LPT1, some for VGA,
etc.  This is unfortunate, but a fact of life.


May your bit buckets always be empty!!!

Matt