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| Logic & Memory Circuits |
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| IBM TH-537 | |
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IBM's early computers and electronic accounting machines used large arrays of 'finger' modules, most of which have one tube and some amount of passive support circuitry. This is an extremely rare TH-537 two-tube module from an IBM 604 Electronic Calculating Punch or similar. The module has two examples of the IBM/Tung-Sol 5696, a xenon-filled thyratron tetrode used as a high speed switch in early IBM computers. |
| Sperry Rand UNIVAC 7052282-00 | |
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This ruggedized circuit card is a six-transistor control line driver, believed to be from the UNIVAC CP-667 36-bit military computer. The CP-667 was intended for the US Navy's ill-fated Mobile OPCON program, and only three of these systems were ever built. The CP-667 logic was built from hybrid integrated circuits, similar to the Western Electric GF401xx devices used in the SAGE program. |
| Digital Equipment Corp. R107D | |
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DEC's 'flip chip' is an iconic example of the discrete transistor logic module. Such modules were used in DEC's computers through the 1960s, the large arrays of color-coded pull tabs a signature characteristic of DEC hardware. The module pictured here is a R107D Inverter. |
| IBM Mainframe LSI | |
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Throughout the 1970s, IBM used hundreds of proprietary metal can-style integrated circuits to build both their mainframes and their smaller computers, like the IBM 5100. The circuit boards used with these ICs are are unusual multi-layer designs with a grid of solder pads covering the entire board. Such boards occasionally flood the surplus collectors' market, usually with no accompanying pedigree. If you can identify any of the boards we have pictured here, please email us. |
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