You can use the Apple Personal Modem with an Epson QX 16 or other IBM
compatible, as long as the compatible system has an RS-232 communication
port.
Here is the standard pinout configuration for connecting the Apple Personal
Modem's circular-8 connector to a common DB-25 connector:
Supported RS-232 data lines.
Mini-circular-8 RS-232
DIN Function Direction Pin
1 Data Set Ready (DSR) From Modem 6
2 Data Term Ready (DTR) To Modem 20
3 Receive Data (RXD) From Modem 3
4 Signal Ground 7
5 Transmit Data (TXD) To Modem 2
6 Signal Ground 7
7 Data Carrier Detect (DCD) From Modem 8
8 Not connected (n.c.)