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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]
-