Original Apple Service Source manual, Macintosh: Basics, Overview; Specifications, Memory p. 2 and Sound and Video p. 6 (viewer pages 6 and 10). Covers Macintosh 128K and 512K; explicitly specifies 512×342 bitmap display. Apple support page support.apple.com/en-om/112190 has a conflicting 512×384 table row but a 512×342 note; the service manual supplies the unambiguous dimensions. No manual date inferred.
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