The problem with examining the parallel port is that we do not know for sure
jus
t how your sampler is sending data.
bits 0-7 of the data at $bfe101 correspond to pins 2-9 and are usually used for
8 bit data transfer, but these pins can be programmed as input or output, each
a
nd every last one of them.
This is done by putting a number in $bfe301, a 1 for output, and 0 for input.
add up the value of all these 1 and 0 in binary and put that number in.
Now thats just getting started, we have 3 more pins on the parallel port we can
program as in/out pins.
These pins are read or written to at $bfd100 and bits 0-2 correspond to pins
11-
13 on the parallel port.
these pins are programmed at $bfd200. other bits at this address control part
o
f the serial in/out, so you should set these bits without disturbing what is
the
re.
Now usually there is a loop of code that is controling the sampler, when does
it
read the next byte, and what control lines does it opperate to get the sampler
to move the next 4,8 or ? bits to the port.
You should probably write the manufacture of your sampler and get just as much
i
nfo as you can about the hardware and what pins of the port control it, etc.
I think it will be hard to just hack, but you can multitask amos with some
progr
ams, and if your lucky, maybe you can just pick up enough
info from reading $bfe101
Press RETURN for more...
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