File:IBM PC AT battery and clock supply circuit (Technical Reference p. 1-114).png
Summary
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Part of IBM's logic diagram of the IBM PC AT (5170) type 2 system board, sheet 17 of 21, showing the battery and real-time clock supply: battery connector J21 (4-pin Berg, pin 2 keyed), diodes CR1 and CR2 (1N4148), C84 (10 µF), the +5 V switch formed by Q2 (2N3906) and Q1 (2N3904) with R24, R25 and R26, the MC14069 oscillator U108 with the 32.768 kHz crystal Y3, and the VDD pin (24) of the MC146818 real-time clock. Rendered at 400 dpi from page 1-114 of the Technical Reference, cropped and rotated to read left to right.
Source
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IBM, Technical Reference, Personal Computer AT, First Edition (September 1985), "Type 2 512KB Planar (Sheet 17 of 21)", p. 1-114 (PDF page 130), hosted here as File:IBM PC AT 5170 Technical Reference Sep85.pdf.
Author
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International Business Machines Corporation
Licence
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Copyright International Business Machines Corporation. Not freely licensed. Reproduced for repair reference, with the source cited.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:33, 25 October 2026 | | 1,720 × 1,020 (30 KB) | Josh (talk | contribs) | Upload for repair guide |
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