Apple PC Compatibility Card - Manual (Page 189)

Building a custom cable
The following chart lists the signals present on the Macintosh Mini DIN-8
serial connector, and the pins that carry these signals on PC-style DB-9 and
DB-25 connectors. You may be able to use this information to build a
custom cable to connect your PC-compatible serial device to a Macintosh
serial port. Refer to the manual for the serial device you want to connect for
more information.
Macintosh signal Macintosh Mini DIN-8 DB-9 DB-25 RS-232 name
HSKo 1 4 20 DTR
HSKi 2 8 5 CTS
TXD- 3 3 2 TXD
GND 4 5 7 GND
RXD- 5 2 3 RXD
TXD+ 6 N/C N/C
GPi 7 1 8 DCD
RXD+ 8 5 7 GND
Connecting a joystick
You can connect a game controller to the joystick port on your PC
Compatibility Card. For more information, see Chapter 5, “Connecting
Monitors and Other Equipment,” and the documentation that came with
your joystick.
Connecting a MIDI device
With an optional adapter, you can connect a MIDI device to the joystick port
on your PC Compatibility Card. For more information, see Chapter 5,
“Connecting Monitors and Other Equipment,” and see the documentation that
came with your MIDI device and MIDI adapter.
189 Setting Up the PC Environment