DMC11 Synchronous Serial Controller: Difference between revisions

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** DMC11-MA (M8202) High Speed Line Unit with Integral Modem (1M), for local coaxial cables up to 6,000 feet
** DMC11-MA (M8202) High Speed Line Unit with Integral Modem (1M), for local coaxial cables up to 6,000 feet
** DMC11-MA (M8202) High Speed Line Unit with Integral Modem (56K), for local coaxial cables up to 18,000 feet
** DMC11-MA (M8202) High Speed Line Unit with Integral Modem (56K), for local coaxial cables up to 18,000 feet
** DMC11-DA/-FA (M8201) Low Speed Line Units (-DA: EIA/CCITT V24 up to 19,2K / -FA: CCITT V35 up to 56K), for use with Bell [[modem]]s 208, and 209
** DMC11-DA/-FA (M8201) Low Speed Line Units (-DA: EIA/CCITT V24 up to 19.2K / -FA: CCITT V35 up to 56K), for use with Bell [[modem]]s 208, and 209
 
All modules are [[DEC card form factor|hex]] cards; the processor module is an [[SPC]] hex card, the line unit modules are notched hex cards.


The DMC11 uses [[Direct Memory Access|DMA]] to transfer data. It can operate in either [[half-duplex]] or [[full-duplex]], at [[baud rate]]s up to 1M bits/second (depending on the line module used and cable length) providing 16-bit [[CRC]], and supports point-to-point operation only.
The DMC11 uses [[Direct Memory Access|DMA]] to transfer data. It can operate in either [[half-duplex]] or [[full-duplex]], at [[baud rate]]s up to 1M bits/second (depending on the line module used and cable length) providing 16-bit [[CRC]], and supports point-to-point operation only.
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The DMC11 supports the [[DDCMP]] (version 3.1 only) and [[Bit Stuff]] line [[protocol|protocols]]; a [[ROM]]-controlled [[microprocessor]] is used to implement DDCMP the protocol.
The DMC11 supports the [[DDCMP]] (version 3.1 only) and [[Bit Stuff]] line [[protocol|protocols]]; a [[ROM]]-controlled [[microprocessor]] is used to implement DDCMP the protocol.


All modules are [[DEC card form factor|hex]] cards; the processor module is an [[SPC]] hex card, the line unit modules are notched hex cards.  
Other Synchronous Serial Controllers (e.g. [[DMR11]], [[DMP11]]) have to be switched to "DMC Mode" (DDCMP V3.1) to be able to communicate with DMC11s.


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==See also==
==See also==


* [[DMR11 synchronous serial line interface]]
* [[DMR11 Synchronous Controller]]
* [[DMP11 synchronous serial line interface]]
* [[DMP11 Synchronous Controller]]


==External links==
==External links==


* [http://www.bitsavers.org/pdf/dec/unibus/EK-DMCMP-TM-002_DMC11_IPL_Microprocessor_Technical_Manual_Aug79.pdf|EK-DMCMP-TM-002 DMC11 IPL microprocessor technical manual]
* [http://www.bitsavers.org/pdf/dec/unibus/DMC11/EK-DMCMP-TM-002_DMC11_IPL_Microprocessor_Technical_Manual_Aug79.pdf DMC11 IPL microprocessor technical manual] (EK-DMCMP-TM-002)
* [http://www.vaxhaven.com/images/a/af/EK-DMCMP-MM-001.pdf|EK-DMCMP-MM-001 DMC11 IPL microprocessor maintenance manual]
* [http://www.vaxhaven.com/images/a/af/EK-DMCMP-MM-001.pdf DMC11 IPL microprocessor maintenance manual] (EK-DMCMP-MM-001)
* [http://www.vaxhaven.com/images/4/4e/EK-DMCLU-MM-001.pdf|EK-DMCLU-MM-001 DMC11 IPL synchronous line unit maintenance manual]
* [http://www.vaxhaven.com/images/4/4e/EK-DMCLU-MM-001.pdf DMC11 IPL synchronous line unit maintenance manual] (EK-DMCLU-MM-001)
* [http://www.vaxhaven.com/images/6/68/EK-DMCMP-OP-001.pdf|EK-DMCMP-OP-001 DMC11 IPL microprocessor user's manual]
* [http://www.vaxhaven.com/images/6/68/EK-DMCMP-OP-001.pdf DMC11 IPL microprocessor user's manual] (EK-DMCMP-OP-001)
* [http://www.vaxhaven.com/images/8/82/EK-DMCLU-OP-001.pdf|EK-DMCLU-OP-001 DMC11 IPL synchronous line unit user's manual]
* [http://www.vaxhaven.com/images/8/82/EK-DMCLU-OP-001.pdf DMC11 IPL synchronous line unit user's manual] (EK-DMCLU-OP-001)
* MP-00076 DMC11 DMC11 Engineering Drawings Rev. C
* [http://www.bitsavers.org/pdf/dec/unibus/DMC11/EY-D2104-HO-02_DMC11_Engineering_Drawings_1975.pdf DMC11 Engineering Drawings] (MP00076)
* MP-00076 DMC11 DMC11 Engineering Drawings Rev. D


[[Category: UNIBUS Serial Interfaces]]
[[Category: UNIBUS Synchronous Serial Interfaces]]

Latest revision as of 01:23, 9 October 2026

The DMC11 Synchronous Serial Controller is a single-line synchronous serial line interface for the UNIBUS.

It consists of two modules:

  • the DMC11-AD processor module (M8200)
  • a line module, one of:
    • DMC11-MA (M8202) High Speed Line Unit with Integral Modem (1M), for local coaxial cables up to 6,000 feet
    • DMC11-MA (M8202) High Speed Line Unit with Integral Modem (56K), for local coaxial cables up to 18,000 feet
    • DMC11-DA/-FA (M8201) Low Speed Line Units (-DA: EIA/CCITT V24 up to 19.2K / -FA: CCITT V35 up to 56K), for use with Bell modems 208, and 209

All modules are hex cards; the processor module is an SPC hex card, the line unit modules are notched hex cards.

The DMC11 uses DMA to transfer data. It can operate in either half-duplex or full-duplex, at baud rates up to 1M bits/second (depending on the line module used and cable length) providing 16-bit CRC, and supports point-to-point operation only.

The DMC11 supports the DDCMP (version 3.1 only) and Bit Stuff line protocols; a ROM-controlled microprocessor is used to implement DDCMP the protocol.

Other Synchronous Serial Controllers (e.g. DMR11, DMP11) have to be switched to "DMC Mode" (DDCMP V3.1) to be able to communicate with DMC11s.

See also

External links

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