MXV11-A Multifunction Option Module

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The MXV11-A Multifunction Option Module is a QBUS dual-height peripheral board, intended to allow the creation of complete systems in a minimal-sized QBUS backplane.

It contains two asynchronous serial lines (using the DL11 programming standard), an optional non-programmable line time 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.

Two different versions exist:

  • MXV11-AA - 8Kbytes of RAM
  • MXV11-AA - 32Kbytes of RAM

It is a Q18 device, and the RAM cannot be used when it is in a Q22 system.

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