MRV11-D Universal Programmable Read-Only Memory

The MRV11-D Universal Programmable Read-Only Memory was a QBUS ROM card. It held up to sixteen 28-pin chips; these could be either ROMs/PROMs/EPROMs (of up to 8-bit x 32K size), or static RAMs. It thus held up to 512KB when fully populated. Configuration is done with a combination of jumpers and two DIP switches.

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 dual-height card, the M8578.

Boot ROM usage

You can use the MXV11-B2 ROM chip set (23-145E4-00 / 23-146E4-00) to convert the MRV11-D into a boot module for QBUS PDP-11s capable of booting from:

• RL01 / RL02 (DL)
• RX01 / RX02 (DX,DY)
• TU58 (DD)
• TSV05 (MS)
• MSCP type Devices e.g. RD51, RX50 (DU)
• DECnet via [[DPV11, DLV11-E, DLV11-F, DUV11

See also

• MRV11-A Read-Only Memory Module
• MRV11-B UV PROM-RAM Memory Module
• MRV11-C Read-Only Memory Module

External links

• Microcomputer Products Handbook - the MRV11-D is covered in Chapter 11 (pp. 171-184 of the PDF)
• MRV11-D Universal PROM Module (EK-MRV1D-UG-001)