File:IBM 5150 memory error code and RAM chip location (HMS p. 200-3).png
Summary
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Figure from IBM's Hardware Maintenance and Service manual for the IBM Personal Computer (5150), part 6025072, First Edition, August 1981, page 200-3 (Memory problem isolation chart). It is a top view of the 16KB-64KB system board RAM: the first two characters of a 201 error code (00, 04, 08, 0C) select the bank and the last two (00 for the parity chip, then 01 to 80 for bits 0 to 7) select the chip. The X marks IBM's example, code 0C40, bank 3 bit 6. The bank codes apply to the 16KB-64KB board only.
Source
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Cropped from page 200-3 (PDF page 46) of File:IBM PC 5150 Hardware Maintenance and Service (August 1981).pdf, rendered at 200 dpi.
Author
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IBM Corporation.
Licence
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Copyright IBM Corporation. Not freely licensed. Reproduced for repair reference, with the source cited.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 21:31, 25 October 2026 | | 855 × 664 (22 KB) | Josh (talk | contribs) | Upload for repair guide |
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