View source for MRV11-D Universal Programmable Read-Only Memory

The '''MRV11-D Universal Programmable Read-Only Memory''' was a [[QBUS]] [[read-only memory|ROM]] card. It held up to sixteen 28-[[pin]] [[integrated circuit|chips]]; these could be either ROMs/[[PROM]]s/[[EPROM]]s (of up to 8-bit x 32K size), or [[static RAM]]s. It thus held up to 512KB when fully populated. Configuration is done with a combination of [[jumper]]s and two [[DIP switch]]es.

The entire ROM contents were either directly visible on the QBUS, or through two independent 2KB windows (somewhat like later, larger [[UNIBUS]] ROM cards). The MRV11-A was a [[DEC card form factor|dual]]-height card, the '''M8578'''.

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==See also==

* [[MRV11-A Read-Only Memory Module]]
* [[MRV11-B UV PROM-RAM Memory Module]]
* [[MRV11-C Read-Only Memory Module]]

==External links==

* [http://www.bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Products_Handbook_1985.pdf Microcomputer Products Handbook] - the MRV11-D is covered in Chapter 11 (pp. 171-1xx of the PDF)
* [http://www.bitsavers.org/pdf/dec/qbus/EK-MRV1D-UG-001_May83.pdf MRV11-D Universal PROM Module] (EK-MRV1D-UG-001)

[[Category: QBUS ROMs]]