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Used IBM system board / planar assembly marked "IBM FRU P/N 71F1378" with board identifier "ADC 4710" visible on the component side.

Large vintage IBM backplane/motherboard assembly with multiple brown expansion slots, several large aluminum heatsinks, edge/card connectors, oscillator cans, ROM/logic ICs, and a large central IBM ceramic processor/control package. The board also shows additional rear-side silkscreen markings including "P/N 71F1070" and "EC C26435A".

This appears to be an IBM proprietary planar/backplane board from a late-1980s to early-1990s system or subsystem rather than a standard PC motherboard. Suitable primarily for restoration, repair, replacement, parts harvesting, or collectible vintage computing applications. Compatibility should be verified by matching the IBM FRU/part numbers and board layout before purchase.

Visible identifiers from the photos include: IBM FRU P/N 71F1378, ADC 4710, P/N 71F1070, and an IBM-labeled ROM marked 71F0138 dated 1989. Item is used, with cosmetic wear and age-related marks visible from handling/storage.

• Item Type: System board / planar / backplane
• Brand: IBM
• IBM FRU Part Number: 71F1378
• Board Marking: ADC 4710
• Rear Board Part Number: 71F1070
• EC Number: C26435A
• Condition: Used
• Form Factor: Proprietary IBM board
• Expansion Slots: Multiple proprietary brown card-edge slots visible
• Cooling: Multiple aluminum heatsinks installed
• Processor/Controller: Large IBM ceramic package present
• Manufacturing Era: Late 1980s to early 1990s (based on visible chip date codes)

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