MRV11-A Read-Only Memory Module

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MRV11-A board (without PROMs)

The MRV11-A Read-Only Memory Module (also known as the MRV11) was the first QBUS ROM card. It held up to 32 4-bit-wide PROM chips, either 256x4 or 512x4; it thus held up to 8KB when fully populated with 512x4 chips. The MRV11-A was a dual-height card, the M7942.

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