View source for MXV11-A Multifunction Option Module

[[Image:MXV11-AC.jpg|200px|right|thumb|MXV11-AC module]]

The '''MXV11-A Multifunction Option Module''' is a [[QBUS]] [[DEC card form factor|dual-height]] [[peripheral]] board ('''M8047'''), intended to allow the creation of complete systems in a minimal-sized QBUS [[backplane]].

It contains two [[asynchronous serial line]]s (using the [[DL11 asynchronous serial line interface|DL11]] programming standard), an optional non-programmable [[line time clock]], a block of [[main memory]], and some [[read-only memory|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 [[Asynchronous serial line#Break|break]].

Two different versions exist:

* MXV11-AA - 8Kbytes of [[Random Access Memory|RAM]]
* MXV11-AC - 32Kbytes of RAM

It is a [[QBUS#Variable address size|Q18]] device, and the RAM <!-- nor ROM --> cannot be used when it is in a Q22 system.

==See also==

* [[MXV11-B Multifunction Option Module]]

==Further reading==

* ''MXV11 Configuration'', [[MicroNote]] #054
* ''MXV11-AA, -AC Cabling'', MicroNote #074
* ''Alternate Clock Frequencies for the MXV11'', MicroNote #083
* ''MXV11 Bootstrap Problems'', MicroNote #105
* ''MXV11 Functionality'', MicroNote #106
<!--  not available online-->

==External links==

* [http://www.bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Processor_Handbook_1979_80.pdf microcomputer processor handbook] - the MXV11-A is covered in Chapter 12, pp. 494-493 (pp. 531-541 of the PDF)
* [http://www.bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Products_Handbook_1985.pdf Microcomputer Products Handbook] - the MXV11-A is covered on pp. 17&ndash;1-21 (pp. 231-251 of the PDF)
* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/MXV11-AA,%20AC%20Configuration%20Guide%20(M8047).pdf MXV11-AA, AC Configuration Guide (M8047)]
* [https://www.mainecoon.com/classiccmp/MXV11-A/ MXV11-A Field Maintenance Print Set] (MP00730)
* [http://www.kpxx.ru/FrainResearch/projects/pdp-11/multifunction.html Multifunction Modules]

[[Category: QBUS Asynchronous Serial Interfaces]]
[[Category: QBUS Memories]]
[[Category: QBUS ROMs]]