DM11-BA Modem Control Multiplexor: Difference between revisions
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The '''DM11-BA Modem Control Multiplexor''' allows [[asynchronous serial line]]s connected to a [[UNIBUS]] [[device controller]] to be connected to [[modem]]s. It could be set to [[interrupt]] the [[Central Processing Unit|CPU]] when a modem control line (Ring, Carrier, etc) changed state. It is a re-implementation of the [[DM11-BB Modem Control Option]]; instead of plugging into a controller [[backplane]] like the -BB, the -BA plugs into a standard [[UNIBUS]] [[Modified UNIBUS Device|MUD]] slot. | The '''DM11-BA Modem Control Multiplexor''' allows [[asynchronous serial line]]s connected to a [[UNIBUS]] [[device controller]] to be connected to [[modem]]s. It could be set to [[interrupt]] the [[Central Processing Unit|CPU]] when a modem control line (Ring, Carrier, etc) changed state. It is a re-implementation of the [[DM11-BB Modem Control Option]]; instead of plugging into a controller [[backplane]] like the -BB, the -BA plugs into a standard [[UNIBUS]] [[Modified UNIBUS Device|MUD]] slot. | ||
It is [[program compatible]] with the DM11-BB (although a single DM11-BA only supports 8 lines, unlike the DM11-BB, which handled 16), and is implemented as a single [[DEC card form factor|hex]] [[printed circuit board| | It is [[program compatible]] with the DM11-BB (although a single DM11-BA only supports 8 lines, unlike the DM11-BB, which handled 16), and is implemented as a single [[DEC card form factor|hex]] [[printed circuit board|board]], the '''M8640'''. | ||
It connects to a passive distribution panel, either one usable with the DM11-BB (such as the H317-B); or the newer H317-M or the functionally identical H317-P (the latter has improved [[Interference|EMI]] shielding). | [[Image:H317BUncovered.jpg|thumb|left|300px|H317-B with cover off]] | ||
It connects, using two [[flat cable]]s plugged into [[Berg connector|Berg headers]] on the board, to a passive distribution panel, either one usable with the DM11-BB (such as the H317-B); or the newer H317-M or the functionally identical H317-P (the latter has improved [[Interference|EMI]] shielding). | |||
[[Category: UNIBUS Serial Interfaces]] | [[Category: UNIBUS Serial Interfaces]] | ||
Revision as of 02:48, 11 February 2020
The DM11-BA Modem Control Multiplexor allows asynchronous serial lines connected to a UNIBUS device controller to be connected to modems. It could be set to interrupt the CPU when a modem control line (Ring, Carrier, etc) changed state. It is a re-implementation of the DM11-BB Modem Control Option; instead of plugging into a controller backplane like the -BB, the -BA plugs into a standard UNIBUS MUD slot.
It is program compatible with the DM11-BB (although a single DM11-BA only supports 8 lines, unlike the DM11-BB, which handled 16), and is implemented as a single hex board, the M8640.
It connects, using two flat cables plugged into Berg headers on the board, to a passive distribution panel, either one usable with the DM11-BB (such as the H317-B); or the newer H317-M or the functionally identical H317-P (the latter has improved EMI shielding).
