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
_ Copyright IBM Corp. 1991
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