Parallel Port - IBM PS/2 N51 SX HMR Manual

IBM PS/2 Model N51 SX HMR

Parallel Port

1.2.9 Parallel Port
The parallel port allows the attachment of devices that accept 8 bits of
parallel data at standard transistor-transistor logic (TTL) levels. The
port has a 25-pin, D-shell connector and is designed primarily for
printers. However, the port can be used as a general input/output port
for any device or application that matches its input/output capabilities.
The system can support four different devices, each addressed separately
as PARALLEL 1, PARALLEL 2, PARALLEL 3, or PARALLEL 4.
¦ Copyright IBM Corp. 1991
1.2.9 - 1