DZQ11 asynchronous serial line interface - Revision history

Jnc: /* External links */ +UM, TM

2023-02-17T09:45:57Z

‎External links: +UM, TM

Jnc: New cat

2022-08-17T01:01:41Z

New cat

Jnc: +img

2021-03-31T20:54:12Z

+img

Jnc: /* Implementation */ later variant dist panel

2021-01-06T16:36:16Z

‎Implementation: later variant dist panel

Jnc: Fairly complete

2021-01-03T03:49:41Z

Fairly complete

New page

The '''DZQ11 asynchronous serial line interface''' was a [[QBUS]] four port [[asynchronous serial line]] mux card for [[Digital Equipment Corporation|DEC]] computers; a re-implementation of the [[DZV11 asynchronous serial line interface‎|DZV11]] (with which it is [[program compatible]] and [[plug compatible]] ). Like the original [[UNIBUS]] [[DZ11 asynchronous serial line interface|DZ11]], it used used [[programmed I/O]], and thus could present a considerable load on the [[Central Processing Unit|CPU]] when running a high speed line.

A 64-entry [[First-In First-Out buffer|FIFO buffer]] silo was provided on the input side. The DZQ11 could operate with [[full-duplex]] [[modem]]s. It provided program-set [[baud rate]]s (up to 19800 baud), but not split speed. [[Break]] could be detected or generated on each line.

==Implementation==

Physically, it was a [[DEC card form factor|dual]] card, the M3106; a cable plugged into a [[Berg connector]] header on the card led the lines out of the computer. The pin assignments in the Berg header are mirrored, so that if the mating Berg connector is plugged in backwards, the only result is to invert the line numbering.

One choice for the cabling is the special BC11U-25 cable; it consisted of 4 separate round cables, from a Berg connector, to individual [[EIA RS-232 serial line interface#Connectors|DB25 male connectors]] (DB-25P) wired as DTEs.

An alternative to the BC11U consisted of a [[flat cable]] from a Berg connector to a distribution panel ([[DEC part numbers|DEC part number]] 70-19964), holding 4 DB25 male connectors. (The distribution panel may be recognized by the part number on its [[printed circuit board|PCB]], 50-15419.)

==Device registers==

{| border=1
! Register !! Abbreviation !! Address
|-
|Control and Status Register || CSR || 760100
|-
|Receiver Buffer Register* || RBUF || 760102
|-
|Line Parameter Register* || LPR || 760102
|-
|Transmit Control Register || TCR || 760104
|-
|Modem Status Register || MSR || 760106
|-
|Transmit Data Register || TDR || 760106
|}

The RBUF and LPR share an address, as do the MSR and TDR: the RBUF is read only, and the LPR is write only; the MSR is read only, and the TDR is write only. Registers marked with a '*' are [[word]]-width only, no byte operations.

The [[address]]es shown are for the first DZ11 in a system (provided that there are no other devices in the [[floating device address space]]); additional ones are normally set to be at 760110, 760120, etc.

===Control and Status Register (CSR)===
{{16bit-header}}
| TRDY || TIE || SA || SAE || colspan=2 |Unused || colspan=2 | Tx Line || RDONE || RIE || MSE || CLR || MAINT || colspan=3 | Unused
{{16bitoctal-bitout}}

*TRDY - Transmitter Ready
*TIE - Transmitter Interrupt Enable
*SA - Silo Alarm
*SAE - Silo Alarm Enable
*Tx Line - Line ready to transmit
*RDONE - Received Done
*RIE - Receiver Interrupt Enable
*MSE - Master Scan Enable
*CLR - Clear input FIFO, CSR and [[UART]]s
*MAINT - Maintenance loopback enabled

=== Receiver Buffer Register (RBUF)===
{{16bit-header}}
| DV || OVR || FRERR || PERR || colspan=2 | Unused || colspan=2 | Rx Line || colspan=8 | RBUF
{{16bitoctal-bitout}}

=== Line Parameter Register (LPR)===
{{16bit-header}}
| colspan=3 | Unused || RXON || colspan=4 | Speed || ODDP || PAREN || STOP || colspan=2 | CLEN || Unused || colspan=2 | Line
{{16bitoctal-bitout}}

===Transmit Control Register (TCR)===
{{16bit-header}}
| colspan=4 | Unused || colspan=4 | DTR || colspan=4 | Unused || colspan=4 | Line Enabled
{{16bitoctal-bitout}}

=== Modem Status Register (MSR)===
{{16bit-header}}
| colspan=4 | Unused || colspan=4 | CD || colspan=4 | Unused || colspan=4 | RI
{{16bitoctal-bitout}}

=== Transmit Data Register (TDR)===
{{16bit-header}}
| colspan=4 | Unused || colspan=4 | Break || colspan=8 | TBUF
{{16bitoctal-bitout}}

==Further reading==

* ''DZQ11 User Guide'', EK-DZQ11-UG-002
* ''DZQ11 Technical Manual'', EK-DZQ11-TM-001

[[Category: QBUS Serial Interfaces]]

@@ Line 1: / Line 1: @@
 [[Image:DZQ11.jpg|250px|thumb|right|DZQ11 M3106 board]]
-The '''DZQ11 asynchronous serial line interface''' was a [[QBUS]] four port [[asynchronous serial line]] mux card for [[Digital Equipment Corporation|DEC]] computers; a re-implementation of the [[DZV11 asynchronous serial line interface‎|DZV11]] (with which it is [[program compatible]] and [[plug compatible]] ). Like the original  [[UNIBUS]] [[DZ11 asynchronous serial line interface|DZ11]], it used used [[programmed I/O]], and thus could present a considerable load on the [[Central Processing Unit|CPU]] when running a high speed line.
+The '''DZQ11 asynchronous serial line interface''' was a [[QBUS]] four port [[asynchronous serial line]] mux card for [[Digital Equipment Corporation|DEC]] computers; a re-implementation of the [[DZV11 asynchronous serial line interface‎|DZV11]] (with which it is [[program compatible]] and [[plug compatible]]). Like the original [[UNIBUS]] [[DZ11 asynchronous serial line interface|DZ11]], it used used [[programmed I/O]], and thus could present a considerable load on the [[Central Processing Unit|CPU]] when running a high speed line.
 A 64-entry [[First-In First-Out buffer|FIFO buffer]] silo was provided on the input side. The DZQ11 could operate with [[full-duplex]] [[modem]]s. It provided program-set [[baud rate]]s (up to 19800 baud), but not split speed. [[Break]] could be detected or generated on each line.
@@ Line 86: / Line 86: @@
 [[Category: QBUS Serial Interfaces]]

← Older revision		Revision as of 20:54, 31 March 2021
Line 1:		Line 1:
		+	[[Image:DZQ11.jpg\|250px\|thumb\|right\|DZQ11 M3106 board]]
		+
	The '''DZQ11 asynchronous serial line interface''' was a [[QBUS]] four port [[asynchronous serial line]] mux card for [[Digital Equipment Corporation\|DEC]] computers; a re-implementation of the [[DZV11 asynchronous serial line interface‎\|DZV11]] (with which it is [[program compatible]] and [[plug compatible]] ). Like the original [[UNIBUS]] [[DZ11 asynchronous serial line interface\|DZ11]], it used used [[programmed I/O]], and thus could present a considerable load on the [[Central Processing Unit\|CPU]] when running a high speed line.		The '''DZQ11 asynchronous serial line interface''' was a [[QBUS]] four port [[asynchronous serial line]] mux card for [[Digital Equipment Corporation\|DEC]] computers; a re-implementation of the [[DZV11 asynchronous serial line interface‎\|DZV11]] (with which it is [[program compatible]] and [[plug compatible]] ). Like the original [[UNIBUS]] [[DZ11 asynchronous serial line interface\|DZ11]], it used used [[programmed I/O]], and thus could present a considerable load on the [[Central Processing Unit\|CPU]] when running a high speed line.

@@ Line 80: / Line 80: @@
 {{16bitoctal-bitout}}
-==Further reading==
+==External links==
-* ''DZQ11 User Guide'', EK-DZQ11-UG-002
+* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-DZQ11-UG-002%20DZQ11%20Asynchronous%20Multiplexer%20User's%20Guide.pdf DZQ11 Asynchronous Multiplexer User's Guide] (EK-DZQ11-UG-002)
-* ''DZQ11 Technical Manual'', EK-DZQ11-TM-001
+* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-DZQ11-TM-001%20DZQ11%20Asynchronous%20Multiplexer%20Technical%20Manual.pdf DZQ11 Asynchronous Multiplexer Technical Manual] (EK-DZQ11-TM-001)
-[[Category: QBUS Serial Interfaces]]
+[[Category: QBUS Asynchronous Serial Interfaces]]

@@ Line 5: / Line 5: @@
 ==Implementation==
-Physically, it was a [[DEC card form factor|dual]] card, the M3106; a cable plugged into a [[Berg connector]] header on the card led the lines out of the computer. The pin assignments in the Berg header are mirrored, so that if the mating Berg connector is plugged in backwards, the only result is to invert the line numbering.
+Physically, it was a [[DEC card form factor|dual]] card, the M3106; a cable plugged into a 40-pin [[Berg connector]] header on the card led the lines out of the computer. The pin assignments in the Berg header are mirrored, so that if the mating Berg connector is plugged in backwards, the only result is to invert the line numbering.
-One choice for the cabling is the special BC11U-25 cable; it consisted of 4 separate round cables, from a Berg connector, to individual [[EIA RS-232 serial line interface#Connectors|DB25 male connectors]] (DB-25P) wired as DTEs.
+===Cabling===
-An alternative to the BC11U consisted of a [[flat cable]] from a Berg connector to a distribution panel ([[DEC part numbers|DEC part number]] 70-19964), holding 4 DB25 male connectors. (The distribution panel may be recognized by the part number on its [[printed circuit board|PCB]], 50-15419.)
+One choice for the cabling is the special BC11U-25 cable; it consisted of 4 separate round cables, from the Berg connector, to individual [[EIA RS-232 serial line interface#Connectors|DB25 male connectors]] (DB-25P) wired as DTEs.
 ==Device registers==