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- PARCP cable and UNI-BI 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
- computer with any other computer if both machines have bidirectional
- parallel ports.
-
- 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 UNI-BI HW adapter (see below).
-
- Note that I give you no warranty about this diagrams and about my PARCP.
- Although it works fine for me and my friends (PARCP was tested on many
- different machines including ST, STE, Falcons and PC's from 386 up to 686)
- your mileage may vary.
-
- If you don't use the UNI-BI HW adapter you should connect the parallel
- cable only after starting PARCP or PAR_IN 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) Bidirectional PARCP cable:
- =============================
-
- Cannon-25 male Cannon-25 male
- 1 ............................... 11 (Strobe -> Busy)
- 2 ............................... 2 (Data 0)
- 3 ............................... 3 (Data 1)
- 4 ............................... 4 (Data 2)
- 5 ............................... 5 (Data 3)
- 6 ............................... 6 (Data 4)
- 7 ............................... 7 (Data 5)
- 8 ............................... 8 (Data 6)
- 9 ............................... 9 (Data 7)
- 11 ............................... 1 (Busy <- Strobe)
- 25 ................................25 (GND <-> GND)
-
- Note: This cable also works with ST-Trans (c) Atari 1992
- and with plip protocol of MiNT-Net (c) Kay Roemer.
-
-
- 2) UNI-BI HW adapter (for PCs with unidirectional parallel port only)
- =====================================================================
-
- UNI (PC port) BI (PARCP cable)
- 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 had a female connector on one side.
- Yes, there you should connect the bidirectional parallel cable so you
- get the full bidirectional transfer even if your PC has got
- unidirectional parallel port only.
-
- Of course you could make a direct UNI-BI cable (with male connectors
- on both ends) but I think that a simple BI cable and a small UNI-BI
- adapter is more flexible solution, because one day in future all PCs
- will have those bidirectional ports and then you simply throw the
- UNI-BI adapter away :) Until then PC is one step behind Atari
- computers because we have 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]
-