English
This version of the Atari Personal Computer System Operating System Users Manual is dated January 1982. Source: Klund1 at AtariAge: https://atariage.com/forums/topic/309576-atari-phc-os-users-manual-january-1982-c016555/
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Atari · PCS · Personal Computer · Atari 400 · Atari 800 · Atari 8-bit · Operating System. Users Manual · CO16555