21 gen 1964 anni - Transformer Read-Only Storage (TROS)

Descrizione:

IBM introduces Transformer Read Only Storage (TROS) with the arrival of the IBM 360. TROS modules preceded solid-state ROM chips, and each bit of this read-only memory for microcode was a little magnetic transformer. Punches in the mylar strips controlled whether current flowed through the transformer or around it, representing a binary zero or a one.

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