IBM Hybrid Diagnostic Card 5801452 System/370 Ceramic Vintage For Sale

IBM Hybrid Diagnostic Card 5801452 System/370 Ceramic Vintage
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IBM Hybrid Diagnostic Card 5801452 System/370 Ceramic Vintage:
$89.99

This is an original IBM hybrid‑logic diagnostic module card, identified by assembly number 5801452 and date‑coded 1981. These cards were used by IBM Field Engineering teams for System/370‑era and early 303x diagnostic and maintenance operations. They were never sold to customers and were produced in very limited quantities.
The board includes multiple IBM proprietary hybrid modules, including:
IBM hybrid logic modules (e.g., 361497, 2390676, 2390540)Large yellow IBM transformer moduleThrough‑hole resistors, capacitors, and discrete componentsFactory‑stamped connector frame 01452 A 8669 MBBackside PCB stamp NURA 1981
Because FE diagnostic hardware was not customer‑facing, these cards rarely appear on the secondary market and are sought after by collectors of vintage IBM systems, restoration specialists, and computing history enthusiasts.
Condition:
Vintage, used conditionClean solder joints and intact componentsNo visible repairs or modificationsSee photos for exact condition and component details
Compatibility:
These cards were used for IBM internal diagnostic and test functions and are not standard FRU logic cards.
Ideal for:
Collectors of IBM System/370 and 303x hardwareRestoration projectsMuseum or archival displayElectronics and hybrid‑module study
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Documentation