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IBM 129 Logic board closeup | by hudson
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IBM 129 Logic board closeup

The logic boards seem to have mostly the same component and are hand soldered. The advertisement said it had "monolithic memory"; these are likely Solid Logic technology. More details: www.nycresistor.com/2012/01/15/ibm-129-card-data-recorder/

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Taken on January 15, 2012