IBM Personal System/2 CL57 SX User Manual

1.2.6 Parallel Connector
The parallel connector allows the attachment of devices that accept 8 bits
of parallel data at standard transistor-transistor logic (TTL) levels.
The connector is a 25-pin, D-shell connector and is designed primarily for
printers. However, the connector 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.
IBM PS/2 Model CL57 SX HMR
Parallel Connector
_ Copyright IBM Corp. 1991
1.2.6 - 1

IBM Personal System/2 CL57 SX Specifications

General

Brand	IBM
Model	Personal System/2 CL57 SX
Category	Desktop
Language	English