MRV11-A Read-Only Memory Module

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.

See also

• MRV11-B UV PROM-RAM Memory Module
• MRV11-C Read-Only Memory Module
• MRV11-D Universal Programmable Read-Only Memory

External links

• microcomputer processor handbook - the MRV11-A is covered on pp. 395-405 of the PDF
• LSI-11, PDP-11/03 user's manual (EK-LSI11-TM-002) - the MRV11-A is covered in Section 4.4 (pp. 62-65 of the PDF), Chapter 9 (pp. 113-117 of the PDF)
• MRV11-A Field Maintenance Print Set (MP00066)