DHQ11 asynchronous serial line interface - Revision history

Jnc: New cat scheme

2023-02-17T09:47:20Z

New cat scheme

Jnc: New cat

2022-08-17T00:58:38Z

New cat

Jnc: +img, TM, FMPS

2021-12-05T18:47:54Z

+img, TM, FMPS

Jnc: avoid redir

2021-01-02T03:13:48Z

avoid redir

Jnc: Correct input buffer size

2020-12-31T13:33:01Z

Correct input buffer size

Jnc: /* Implementation */ two variants

2020-12-31T09:36:56Z

‎Implementation: two variants

Jnc: An OK start

2020-12-31T09:12:29Z

An OK start

New page

The '''DHQ11 asynchronous serial line interface''' is the second [[QBUS]] equivalent to the [[UNIBUS]] [[DH11 asynchronous serial line interface|DH11]] (it 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 64-character [[First-In First-Out buffer|FIFO buffer]].

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

==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 [[Digital Equipment Corporation|DEC]] part number 50-15588-01 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==

The [[register]]s will depend on whether it is emulating a DHV11 or DHU11.

===Control and Status Register (CSR)===

In DHU11 mode, the CSR is:
{{16bit-header}}
| TXA || TXIE || DF || TDE || Unused || colspan=3 | Tx Line || RDA || RXIE || MR || SKIP || Unused || colspan=3 | Line
{{16bitoctal-bitout}}

*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

==Further reading==

* ''DHQ11 User Guide'', EK-DHQ11-UG-002

[[Category: QBUS Serial Interfaces]]

← Older revision		Revision as of 09:47, 17 February 2023
Line 38:		Line 38:
	* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/DHQ11%20Notes.pdf DHQ11 Notes]		* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/DHQ11%20Notes.pdf DHQ11 Notes]

−	[[Category: QBUS ~~Serial Interfaces]]~~	+	[[Category: QBUS Asynchronous Serial Interfaces]]
−	~~[[Category: DEC~~ Asynchronous Serial Interfaces]]

← Older revision		Revision as of 00:58, 17 August 2022
Line 39:		Line 39:

	[[Category: QBUS Serial Interfaces]]		[[Category: QBUS Serial Interfaces]]
		+	[[Category: DEC Asynchronous Serial Interfaces]]

@@ Line 1: / Line 1: @@
 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]].
@@ Line 5: / Line 7: @@
 ==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.
+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==
@@ Line 29: / Line 31: @@
 *Line - Select TXC through TBCT
-==Further reading==
+==External links==
-* ''DHQ11 User Guide'', EK-DHQ11-UG-002
+* [http://www.bitsavers.org/pdf/dec/qbus/EK-DHQ11-UG-002.pdf DHQ11 User Guide] (EK-DHQ11-UG.002)
 [[Category: QBUS Serial Interfaces]]

@@ Line 1: / Line 1: @@
-The '''DHQ11 asynchronous serial line interface''' is the second [[QBUS]] equivalent to the [[UNIBUS]] [[DH11 asynchronous serial line interface|DH11]] (it 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]].
-It can be set (via a switch) to emulate either a DHV11 or [[DHU11]].
+It can be set (via a switch) to exactly emulate either a DHV11 or [[DHU11 asynchronous serial line interface|DHU11]].
 ==Implementation==

@@ Line 1: / Line 1: @@
-The '''DHQ11 asynchronous serial line interface''' is the second [[QBUS]] equivalent to the [[UNIBUS]] [[DH11 asynchronous serial line interface|DH11]] (it 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 64-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 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]].
 It can be set (via a switch) to emulate either a DHV11 or [[DHU11]].
@@ Line 5: / Line 5: @@
 ==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 [[Digital Equipment Corporation|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.
+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==