Personal Computer AT Technical Reference (1502494)

Scope and location

Exact named pinout variant only; not capability or compatibility approval.

IBM Personal Computer AT Serial/Parallel Adapter section, printed p. 18, 'Pin Assignment for Serial Port' figure (with connector drawing, pins 1-5 / 6-9); IBM Personal Computer AT Serial/Parallel Adapter section, printed p. 23, 'Parallel Interface' figure (signals, directions, pins 1-25); Serial/Parallel Adapter section, printed p. 1: rear 9-pin D-shell 'classified as an RS-232C port'

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Inspected

2026-10-20

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public pdf text

Recorded AI-assisted source inspection; not independent human approval or hardware testing.

Source scope and unresolved evidence are preserved in the engineering variant.

Source inspection is separate from independent technical approval, rights clearance and hardware testing.