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GEOCABLE2.DOC
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38 lines
I've done a little experimentation and
have come up with the connections
required to construct a geoCable. The
table below shows the pin connections
for the User Port, the Centronics
connector found on parallel interface
printers, and for the DB-25 connector
of the IBM-PC parallel port type. I
include the last because the cable
(Centronics to PC DB-25) is commonly
available.
Instead of making a cable, I used a
cable for a PC and made an adaptor to
plug it into the C64's User Port. The
adaptor consists of a User Port
connector and a DB-25S glued to a small
piece of circuit board, with wires run
between the two connectors.
Signal Name PC DB-25
User Port Centronics
-STROBE M 1 1
D0 C 2 2
D1 D 3 3
D2 E 4 4
D3 F 5 5
D4 H 6 6
D5 J 7 7
D6 K 8 8
D7 L 9 9
BUSY B 11 11
GND 1,12,A,N 18-25 16,19-30,33
Ken Wallace
Corrections made 17 May 89.