🚀 go-pugleaf

>     I recently purchased a Radio Shack PC-6 pocket computer.  For various
> reasons I would like to interface it to my computer using the port that it
> uses to connect to its printer and tape drive.  I expect decoding the signals
> to be something of a pain, so to avoid reinventing the wheel I'd like to hear
> from anyone out there who might have already done this.
> 
> John DuBois
> spcecdt@ucscb.ucsc.edu
> ...!ucbvax!ucscc!ucscb!spcecdt

	I also have a PC-6, and I have been trying to figure out the
port for quite some time now.  All I know is that there are two non-
overlapping clocks, two enables, one operation control line, and four
data bits.  Also, VDD seems to be -5 volts, not +5 volts.  A lot happens
on this port during keyboard input, program execution, etc., so I assume
that it is not just a peripheral port, but a direct connection to the
computer's internal bus.  Also, it's very easy to load the port so that
the PC stops operating.  I did this when I was trying some pull-up resistors
to determine when the lines become tri-stated.

	If anyone finds out any more about this beast, please post it,
or drop me some e-mail.  Thanks.

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