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Revolution - Das Atari CD Magazin 1997
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cable.txt
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1996-11-19
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PARCP cable and PC-ST HW adapter:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The following diagrams shows you how to build your own parallel cable for
use with my PARCP (PARallel CoPy). This cable allows you to connect your ST
with another ST, Amiga or PC (with bidirectional parallel port).
WARNING: If you have got PC with unidirectional parallel port only (you can
find it out by running enclosed PARTEST.EXE), you will also have to build
and use the PC-ST HW adapter (see below).
BTW, I give you no warranty about this diagrams and about my PARCP.
Although it works fine for me and for my friends (PARCP was tested on four
Falcons, 386DX, 486DX4 and some Pentiums) your mileage may vary.
If you don't use the PC-ST HW adapter you should connect the parallel
cable only after starting PARCP on one computer (at that time its parallel
port is switched to input state and can be connected with the other
parallel port without a risk of damage both parallel ports).
Also make sure the computers are on the same electrical ground otherwise
you will get a nice fire of cable and parallel ports :) Putting both
computers' power cables to the same power outlet is always a good idea.
1) ST-ST bidirectional cable:
ST ST
Cannon-25 male Cannon-25 male
1 ............................... 11
2 ............................... 2
3 ............................... 3
4 ............................... 4
5 ............................... 5
6 ............................... 6
7 ............................... 7
8 ............................... 8
9 ............................... 9
11 ............................... 1
25 ................................25
Note: this cable also works with ST-Trans (c) Atari 1992
2) PC-ST HW adapter (for PCs with unidirectional parallel port only)
PC ST
Cannon-25 male Cannon-25 female
1 .............................. 1
2 -> IC1.2 IC1.19 <- 2
3 -> IC1.3 IC1.18 <- 3 The IC's are also wired together:
4 -> IC1.4 IC1.17 <- 4
5 -> IC1.5 IC1.16 <- 5 IC1.10 ..... IC2.8 + IC2.15
6 -> IC1.6 IC1.15 <- 6 IC1.11 ..... IC2.1
7 -> IC1.7 IC1.14 <- 7 IC1.12 ..... IC2.10
8 -> IC1.8 IC1.13 <- 8 IC1.13 ..... IC2.6
9 -> IC1.9 IC1.12 <- 9 IC1.14 ..... IC2.13
10 -> IC2.9 IC1.15 ..... IC2.3
11 .............................. 11 IC1.16 ..... IC2.11
12 -> IC2.7 IC1.17 ..... IC2.5
13 -> IC2.12 IC1.18 ..... IC2.14
14 -> IC1.1 IC1.19 ..... IC2.2
15 -> IC2.4 IC1.20 ..... IC2.16
16 -> IC1.20 + IC2.16
17 -> IC1.11 + IC2.1
25 -> IC1.10 + IC2.8 + IC2.15 ... 25
IC1 = 74HC574
IC2 = 74HC257
I think the *HC* is important, because both IC's eat current from PC's
parallel port and the maximum draw from it can be about 10 mA only IIRC.
Note: I'm sure you noticed the adapter has a female connector on one side.
Yes, there you should connect the ST-ST cable so you get the full
ST-unidirectionalPC cable :)
Of course you could make a direct ST-unidir.PC cable but I think that
solution described above is more flexible (at one day all PCs will
have those bidirectional ports and then you simply throw the HW
adapter away :) Until then PC is one step behind Atari computer
because we had bidirectional ports since 1985!! <Power without Price>
Petr [stehlik@cas3.zlin.vutbr.cz|90:1200/2.1@nest.ftn|2:421/36.37@fidonet.org]