DMV11 Synchronous Controller
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.
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:
|-AP||EIA RS-232C/CCITT V.28|
|-FP||EIA RS-423A/CCITT V.24|
|Control and Status Register||SEL0||16xxx0|
|Control/Response Code Register||BSEL2||16xxx2|