Difference between revisions of "DS11 Multiple Line Synchronous Interface"
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| − | The '''DS11 Multiple Line Synchronous Interface''' | + | The '''DS11 Multiple Line Synchronous Interface''' was an early [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]; it could handle up to 16 lines. It used [[programmed I/O]] (with separate receive and transmit [[interrupt]]s) to transfer data; it could operate in either [[half-duplex]] or [[full-duplex]] mode. |
| − | It | + | It provided an [[EIA RS-232 serial line interface|EIA RS-232]] interface to Bell 200 series [[modem]]s (such as the model 201, and equivalents), and also connect to Bell 300 series modems, such as the model 303. Character lengths of 6, 8 and 12 bits were supported, and could be configured by software. |
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| − | + | It consisted of a master line scanner, and up to four adapters, each of which could handle up to four lines; each line had a separate [[DEC card form factor|quad]] M7110 Line Control Module. It used an [[M105 Address Selector]] to set its bus address. Physically, it is a large quad-height [[backplane]], mounted in a 19" cabinet such as an [[H960 rack|H950]], along with an [[DEC indicator panel]]. | |
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It provided an [[EIA RS-232 serial line interface|EIA RS-232]] interface (to Bell 200 series [[modem]]s, such as the model 201, and equivalents), and optionally a [[20mA current loop serial line interface|current loop]] interface (to Bell 300 series modems, such as the model 303, and equivalents). [[Baud rate]]s of up to 9.6K bits/second were supported by the EIA interface, and up to 100K bits/second by the current loop interface. | It provided an [[EIA RS-232 serial line interface|EIA RS-232]] interface (to Bell 200 series [[modem]]s, such as the model 201, and equivalents), and optionally a [[20mA current loop serial line interface|current loop]] interface (to Bell 300 series modems, such as the model 303, and equivalents). [[Baud rate]]s of up to 9.6K bits/second were supported by the EIA interface, and up to 100K bits/second by the current loop interface. | ||
| − | The [[character]] length (5, 6, 7 or 8 [[bit]]s), and the [[sync character]], were selectable; [[parity]] (even or odd) was optionally supported for error detection | + | The [[character]] length (5, 6, 7 or 8 [[bit]]s), and the [[sync character]], were selectable; [[parity]] (even or odd) was optionally supported for error detection. All configuration, as well as all the modem control leads, could be set under program control. A [[jumper]] allows configuration of whether one or two contiguous sync characters is needed for synchronization. |
| − | <!-- It apparently supported idling (sending the sync character); the line could also be set to a [[serial line|mark]] condition when not transmitting characters | + | <!-- It apparently supported idling (sending the sync character); the line could also be set to a [[serial line|mark]] condition when not transmitting characters. |
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==Registers== | ==Registers== | ||
Revision as of 03:36, 19 November 2023
The DS11 Multiple Line Synchronous Interface was an early synchronous serial line interface for the UNIBUS; it could handle up to 16 lines. It used programmed I/O (with separate receive and transmit interrupts) to transfer data; it could operate in either half-duplex or full-duplex mode.
It provided an EIA RS-232 interface to Bell 200 series modems (such as the model 201, and equivalents), and also connect to Bell 300 series modems, such as the model 303. Character lengths of 6, 8 and 12 bits were supported, and could be configured by software.
It consisted of a master line scanner, and up to four adapters, each of which could handle up to four lines; each line had a separate quad M7110 Line Control Module. It used an M105 Address Selector to set its bus address. Physically, it is a large quad-height backplane, mounted in a 19" cabinet such as an H950, along with an DEC indicator panel.
Registers
| Register | Abbreviation | Address |
|---|---|---|
| Receiver Status Register | RxCSR | 775xx0 |
| Receiver Data Buffer Register | RxDBUF | 775xx2 |
| Transmitter Status Register | TxCSR | 775xx4 |
| Transmitter Data Buffer Register | TxDBUF | 775xx6 |
Line addresses:
- Line 0: 775400-775406
- ...
- Line 15: 775570-775576
See also
Further reading
- DS11 Multiple Line Synchronous Interface Maintenance Manual (DEC-00-DS11-DB; not available online, but in fiche)
External links
- DECsystem-10 System Reference Manual - documents the DS11 registers in Appendix C (pp. 370-371 of the PDF)
- M7110
