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2023-05-13T21:54:39Z

Slightly stubby, but some else can improve it

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The '''DMR11 Synchronous Controller''' is a [[microprocessor]]-based intelligent single-line [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]. It uses [[Direct Memory Access|DMA]] to transfer data to and from [[main memory]]. The DMR11 can operate in either [[half-duplex]] or [[full-duplex]], at [[baud rate]]s up to 1M bits/second. 

It consists of two [[DEC card form factor|hex]] boards:

* a microprocessor module (M8207-RA)
* a line module (M8203), which can be configured to one of 4 choices via [[jumper]]s and [[DIP switch]]es, one of:
** DMR11-AA [[EIA RS-232 serial line interface|RS-232]] (up to 19.2K bps) or [[RS-423]] (up to 56K bps) or [[null modem]]
** DMR11-AB [[V.35]] (up to 1M bps)
** DMR11-AC integral [[modem]] (56K, 250K, 500K, 1M bps)
** DMR11-AE [[EIA RS-422 serial line interface|RS-422]] (up to 1M bps)

Both plug into [[Small Peripheral Controller|SPC]] slots, preferably adjacent; the two boards communicate over a BC08S [[flat cable]]. The [[device driver]] communicates with the DMR11 via four control and status [[register]]s.

It supports [[Digital Data Communications Message Protocol|DDCMP]] (version 4.0), including support for [[cyclic redundancy check|CRCs]]. It is [[program compatible]] with [[DMC11 Synchronous Serial Controller|DMC11]].

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==See also==

* [[DMP11 Synchronous Controller]]


==External links==

* [https://manx-docs.org/collections/hcps/dmr11ug2.pdf DMR11 synchronous controller user's guide] (EK-DMR11-UG-002)
* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-DMR11-TM-002%20DMR11%20Synchronous%20Controller%20Technical%20Manual.pdf DMR11 synchronous controller technical manual] (EK-DMR11-TM-002)
* [http://bitsavers.org/pdf/dec/unibus/EK-M8207-TM-002_M8207_Microprocessor_Technical_Manual_198211.pdf M8207 Microprocessor Technical Manual] (EK-M8207-TM-002)
* [http://bitsavers.org/pdf/dec/unibus/EK-M8203-TM-002_M8203_Line_Unit_Technical_Manual_198103.pdf M8203 Line Unit Technical Manual] (EK-M8203-TM-002)
* [http://bitsavers.org/pdf/dec/unibus/MP00911_DMR11_schem.pdf DMR11 Field Maintenance Print Set] (MP00911)

[[Category: UNIBUS Synchronous Serial Interfaces]]

DMR11 Synchronous Controller - Revision history

Jnc: Slightly stubby, but some else can improve it