File:Apple Lisa I-O Board Schematic 050-4008-K.pdf
Summary
[edit | edit source]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
[edit | edit source]http://bitsavers.org/pdf/apple/lisa/hardware/Lisa_1_IO_Board/050-4008-K_Lisa_IO.pdf (retrieved 2026-09-30)
Author
[edit | edit source]Apple Computer, Inc. (designer P. Baker)
Licence
[edit | edit source]Copyright Apple Computer, Inc. Hosted for preservation and repair reference.
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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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