RC-85 PAL "Faker"

When upgrading an RC-85 from something prior to V3.xx to V3.xx or later,
the 74LS138 must be replaced with something else.  ACC used a $150 PAL
board to do the job, but you can do it by rewiring the 74LS138.  The
following information from Paul Kindell should help.

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I took years ago a good pal from an RC-85 and hooked a dip sw to it's
input.  By running data into the PAL I came up with this design for the
74LS138.  It is my opinion the PAL was just a way to try and copy
protect the eprom and/or get $150.00 from everyone.

I take 2 16 pin machine pin, IC sockets and plug them together.  Take 4
short pieces of wire wrap wire and strip the ends back.  Solder one wire
into the socket pin 7, then another into socket pin 9, 10, & 11.  You
should now have 4 wires sticking up into the air from the socket.  Take
the 74LS138 and bend up in the air pins 7, 9, 10, & 11.  Now solder the
wire from the ic socket pin 7 to ic pin 9.  Socket wire pin 9 to ic pin
7.  Socket wire pin 10 to ic pin 11.  Socket wire 11 to ic pin 10.

This has worked for me in the past.  I have the 2 pals I got from ACC
back on 4/11/95. They are GAL16V8B, my blown PAL shows the number
PAL10L8NC (I think it's blown, my RC-85 is still not working yet)

I doubt they can be read, but I don't really think we need to. I think
we can use the Faker or design our own PAL to do the same thing ACC's
did.

Paul WB8ZVL