File:Apple Lisa I-O Board Schematic 050-4008-K.pdf

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Summary

Apple Computer drawing 050-4008, revision K: "Schematic, System I/O, Lisa". Five D-size sheets covering the Lisa I/O board. Sheet 5 ("Analog circuits") shows the contrast latch, the speaker amplifier and the battery backup circuit: a 4.8 V NiCd pack (BATV) with switch SW1, charged from +12 V through D7 (1N4001) and R39 (150 ohm, 1/2 W), and a 4193 switching regulator producing the +5B standby supply.

Source

http://bitsavers.org/pdf/apple/lisa/hardware/Lisa_1_IO_Board/050-4008-K_Lisa_IO.pdf (retrieved 2026-09-30)

Author

Apple Computer, Inc. (designer P. Baker)

Licence

Copyright Apple Computer, Inc. Hosted for preservation and repair reference.

File history

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	Date/Time	Dimensions	User	Comment
current	13:58, 30 September 2026	0 × 0 (733 KB)	Josh (talk \| contribs)	Upload from bitsavers for Apple Lisa pages

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