MXV11-B Multifunction Option Module

The MXV11-B Multifunction Option Module is a QBUS dual-height peripheral board (M7195), intended to allow the creation of complete systems in a minimal-sized QBUS backplane. It is very similar to the earlier MXV11-A Multifunction Option Module, except that it is a Q22 device.

It contains two asynchronous serial lines (using the DL11 programming standard), an optional clock, a block of main memory, and some PROM for bootstrap purposes. The serial lines are connected via 10-pin Berg connector headers on the top edge of the card, using the standard DEC asynchronous serial line pinout, and line 1 can be set to halt or boot the machine on a break.

The clock is program compatible with the KW11-L Line Time Clock, but it is not a line time clock, since it cannot be driven from AC wall power; it can be connected to 50Hz, 60Hz, or 800Hz clock signals from a divided-down 20MHz crystal which is also used to provide the clock to the serial lines.

The board contains 128Kbytes of RAM; it can hold a pair of 2, 4, 8 or 16KB ROMs.

Boot ROM usage

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

• 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

• MXV11-A Multifunction Option Module

External links

• MXV11-B Multi-Function Option Module User Guide (EK-MXV1B-UG-001)
• Microcomputer Products Handbook - the MXV11-B is covered on pp. 18–1-18 (pp. 253-270 of the PDF)
• Disabling RAM on the MXV11-BF (MicroNote #019)
• MXV11-B Multifunction Option Module
• Multifunction Modules