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If you want to eliminate the need for an external null modem adapter, unscrew
the jack screws and rewire the pigtail as follows:
Serial connector with null modem crossovers (solder side view).
This will allow you to connect the P112 to an x86-style serial port with a cable
wired straight through. Again, depending on your terminal, you may be able
to use a standard 9-to-25-pin modem cable to connect the P112 to a standard
serial terminal.
2.1.3
Disk Drive Cable
This is wired as for a PC-AT, ie a direct 34-way connection from P9 or P10 to
the first drive, then cores 10-16 reversed in the path to the 2nd drive. In P9, the
first drive will be Drive 0, and the second Drive 1. From P10, they are Drives
3 and 2 similarly (note the reversed assignment).
In other words, a standard floppy ribbon cable is what you need. This cable is
not included. Sorry, I couldn't find enough in large quantities.
2.1.4
Parallel Port Cable
A standard 26-way IDC receptacle fits the board. Clip off core 26 of the cable,
and run the others to a DB-25 socket (Pin-1 to Pin-1). This generates a standard
PC-type printer interface.
This sort of cable is identical to the provided terminal cables. Unfortunately, I
was unable to find any of these pre-made, so one is not included in the kit of
parts.
9
2
3
5
1
8
4
6
7
9 8 7 6 5 4 3 2 1
10
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