Re: Trying to get an Apple Parallel Card to work

[dempson@atlantis.actrix.gen.nz (David Empson)]

In article <945_9505192131@genesplicer.org>,
Scott Alfter <Scott.Alfter@skunkworks.genesplicer.org> wrote:
> Is the pinout of the DB-25 connector on the parallel card the same as on an
> IBM clone's parallel port

No - it is completely different.  It is also completely different to
the Grappler+.

Pin  Signal             Pin  Signal

1    Data in, bit 0     14   Data in, bit 4
2    Signal ground      15   Strobe out
3    Data in, bit 2     16   Acknowledge in
4    Signal ground      17   Data in, bit 1
5    Data out, bit 0    18   Data in, bit 7
6    Data out, bit 1    19   Data in, bit 5
7    (blocked)          20   Signal ground
8    Data out, bit 2    21   Data in, bit 6
9    -                  22   Data out, bit 3
10   -                  23   Data out, bit 4
11   Data out, bit 5    24   Signal ground
12   Data out, bit 6    25   Data in, bit 3
13   Data out, bit 7


The recommended cable pinout for a typical parllel printer (Epson
MX-80/100) is:

DB-25     Printer
2         19
5         2
6         3
7  (remove pin from Apple connector)
8         4
11        7
12        8
13        9
15        1
16        10
18        35
19        12
21        13
22        5
23        6
24        16
25        32


I don't have documetnation on the Centronics pinout handy, so I'm not
sure what the data inputs are being used for (bits 7, 6, 5 and 3).
-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand