Difference between revisions of "DHQ11 asynchronous serial line interface"

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[[Image:M3107DHQ11.jpg|250px|thumb|right|DHQ11 card]]
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The '''DHQ11 asynchronous serial line interface''' is the second [[QBUS]] equivalent to the [[UNIBUS]] [[DH11 asynchronous serial line interface|DH11]] (it is a replacement for the [[DHV11 asynchronous serial line interface|DHV11]]). It provided 8 [[EIA RS-232 serial line interface|RS-232]] [[asynchronous serial line]]s. Output used [[Direct Memory Access|DMA]] (with each line having its own [[buffer]] [[pointer]] and count); input used a 256-character [[First-In First-Out buffer|FIFO buffer]].
 
The '''DHQ11 asynchronous serial line interface''' is the second [[QBUS]] equivalent to the [[UNIBUS]] [[DH11 asynchronous serial line interface|DH11]] (it is a replacement for the [[DHV11 asynchronous serial line interface|DHV11]]). It provided 8 [[EIA RS-232 serial line interface|RS-232]] [[asynchronous serial line]]s. Output used [[Direct Memory Access|DMA]] (with each line having its own [[buffer]] [[pointer]] and count); input used a 256-character [[First-In First-Out buffer|FIFO buffer]].
  
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==Implementation==
 
==Implementation==
  
Physically, the DHQ11 consisted of a single [[DEC card form factor|dual]] card, the M3107, connected to a pair of H3173-A distribution panels (4 lines each) via a BC05L [[flat cable]], one per distribution panel; the BC05L connects to a 40-pin [[Berg connector|Berg header]] on each end. The H3173-A can be recognized by the [[DEC part number]] 50-15588-01 or -02 on its [[printed circuit board|PCB]]; each contains four male [[EIA RS-232 serial line interface#Connectors|DB-25 connectors]] (DB-25P). In addition to the usual '-xx' length indicators on the BC05L cable, it was also available in BC05L-1K (21 inch) and BC05L-2F (30 inch) lengths.
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Physically, the DHQ11 consisted of a single [[DEC card form factor|dual]] card, the '''M3107''', connected to a pair of H3173-A distribution panels (4 lines each) via a BC05L [[flat cable]], one per distribution panel; the BC05L connects to a 40-pin [[Berg connector|Berg header]] on each end. The H3173-A can be recognized by the [[DEC part number]] 50-15588-01 or -02 on its [[printed circuit board|PCB]]; each contains four male [[EIA RS-232 serial line interface#Connectors|DB-25 connectors]] (DB-25P). In addition to the usual '-xx' length indicators on the BC05L cable, it was also available in BC05L-1K (21 inch) and BC05L-2F (30 inch) lengths.
  
 
==Device registers==
 
==Device registers==
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*Line - Select TXC through TBCT
 
*Line - Select TXC through TBCT
  
==Further reading==
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==External links==
  
* ''DHQ11 User Guide'', EK-DHQ11-UG-002
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* [http://www.bitsavers.org/pdf/dec/qbus/EK-DHQ11-UG-002.pdf DHQ11 User Guide] (EK-DHQ11-UG.002)
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* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-DHQ11-TM-01%20DHQ11%20Technical%20Manual.pdf DHQ11 Technical Manual] (EK-DHQ11-TM-01)
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* [http://www.bitsavers.org/pdf/dec/qbus/MP02380_DHQ11_sch_Jul90.pdf Field Maintenance Print Set] (MP02380)
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* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/DHQ11%20Notes.pdf DHQ11 Notes]
  
 
[[Category: QBUS Serial Interfaces]]
 
[[Category: QBUS Serial Interfaces]]
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[[Category: DEC Asynchronous Serial Interfaces]]

Revision as of 01:58, 17 August 2022

DHQ11 card

The DHQ11 asynchronous serial line interface is the second QBUS equivalent to the UNIBUS DH11 (it is a replacement for the DHV11). It provided 8 RS-232 asynchronous serial lines. Output used DMA (with each line having its own buffer pointer and count); input used a 256-character FIFO buffer.

It can be set (via a switch) to exactly emulate either a DHV11 or DHU11.

Implementation

Physically, the DHQ11 consisted of a single dual card, the M3107, connected to a pair of H3173-A distribution panels (4 lines each) via a BC05L flat cable, one per distribution panel; the BC05L connects to a 40-pin Berg header on each end. The H3173-A can be recognized by the DEC part number 50-15588-01 or -02 on its PCB; each contains four male DB-25 connectors (DB-25P). In addition to the usual '-xx' length indicators on the BC05L cable, it was also available in BC05L-1K (21 inch) and BC05L-2F (30 inch) lengths.

Device registers

The registers will depend on whether it is emulating a DHV11 or DHU11.

Control and Status Register (CSR)

In DHU11 mode, the CSR is:

TXA TXIE DF TDE Unused Tx Line RDA RXIE MR SKIP Unused Line
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
  • TXA - Transmitter Action
  • TXIE - Transmit Interrupt Enable
  • DF - Diagnostic Fail
  • TDE - Transmit DMA Error
  • Tx Line - Line which set TXA
  • RDA - Received Data Available
  • RXIE - Receive Interrupt Enable
  • MR - Master Reset
  • SKIP - Skip Self-Test
  • Line - Select TXC through TBCT

External links