DMV11 Synchronous Controller

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The DMV11 Synchronous Controller (more fully, the DMV11 Intelligent Communications Synchronous Line Controller) is a multi-line synchronous serial line interface for the QBUS. It used DMA to transfer data. It could operate in either half-duplex or full-duplex, at baud rates up to 56K bits/second (depending on software and system configuration), and supported both point-point and multi-point operation.

The byte-oriented DDCMP line protocol was supported; a microprocessor is used to implement the protocol.

It was a quad card; Berg headers on the card connected to flat cables which led off to the modem connectors. There were 4 models, the -AP, -BP, and -FP used the M8053 card, and the -CP used the M8064. (Earlier, there were 3 models; the -AA, -AB, and -AC.) They supported the following interface standards:

Model Interface
-CP Integral modem


Register Abbreviation Address
Control and Status Register SEL0 16xxx0
Control/Response Code Register BSEL2 16xxx2
Tributary Address BSEL3 16xxx3
Command/Response Register SEL4 16xxx4
Command/Response Register SEL6 16xxx6

Addresses are assigned from the floating device address space.

See also

External links