DJ11 Asynchronous 16-Line Multiplexer - Revision history

Jnc: New cat scheme; +link

2023-02-18T09:36:18Z

New cat scheme; +link

Jnc: Jnc moved page DJ11 asynchronous serial line interface to DJ11 Asynchronous 16-Line Multiplexer

2022-11-24T00:34:58Z

Jnc moved page DJ11 asynchronous serial line interface to DJ11 Asynchronous 16-Line Multiplexer

Jnc: fix errs; add link to manual

2022-11-24T00:34:41Z

fix errs; add link to manual

Jnc: New cat

2022-08-17T13:55:34Z

New cat

Jnc: /* Implementation */ Power

2019-09-23T22:13:59Z

‎Implementation: Power

Jnc: /* Registers */ Add

2019-09-23T22:11:35Z

‎Registers: Add

Jnc: Add board layout

2019-09-23T11:43:48Z

Add board layout

Jnc: A decent start

2019-09-23T01:03:21Z

A decent start

New page

The '''DJ11 asynchronous serial line interface''' is a [[UNIBUS]] [[peripheral]] which provides up to 16 [[asynchronous serial line]]s. Both input and output used [[programmed I/O]]; on input a 64-character [[First-In First-Out buffer|FIFO buffer]] made over-runs unlikely. [[Modem]]s were not supported.

It was less flexible than, and not as efficient as, the roughly contemporaneous [[DH11 asynchronous serial line interface|DH11]].
It was effectively replaced by the [[DZ11 asynchronous serial line interface|DZ11]], which was cheaper (it was a single [[DEC card form factor|hex]] [[Printed circuit board|board]]), and more flexible.

The DJ11 allowed support of either all [[20mA current loop serial line interface|20mA]] or all [[EIA RS-232 serial line interface|EIA RS-232]] serial lines, by means of a dual-width level converter board. The parameters for each line:

* separate input and output baud rates (75 to 9600)
* character length (5-8 bits)
* stop bits (1, 1-1/2 and 2)
* parity (odd, even, none)

could only be set with [[jumper]]s, in groups of four lines. A 'break' condition on the line (i.e. continuous assertion) could also be generated and detected.

==Implementation==

The implementation took a single custom [[system unit]] [[backplane]], containing multiple cards (see list below).

===Versions===

The versions of the DJ11 were:

* DJ11-AA - EIA level conversion
* DJ11-AB - No level conversion ([[TTL]] levels)
* DJ11-AC - EIA level conversion

===Boards===

The DJ11 included the following boards:

* M7285 - Mux control (hex)
* M7279 - Receive silo (dual)
* M7280 (2) - Multiple UARTs (quad)
* [[M7821]] - Interrupt control
* [[M105]] - Address selection

The -AA, -AB and -AC versions of the DJ11 also included one:

* M5901 EIA conversion module
* M5900 TTL 'conversion' module
* M5902 20mA conversion module

respectively, which occupied a dual slot.

===Distribution panels===

The rack-mounted passive distribution panel used in the -AA EIA version was the H317-B distribution panel, which mounted directly into a standard 19" rack, and contained 16 DB-25P connectors. It was connected to the DJ11 with a pair of BC08S cables, which carried the 'main' signals (data, etc - i.e. non-modem control).

The -AC used an H317-A distribution panel, which had screw connectors.

[[Category: UNIBUS Serial Interfaces]]

@@ Line 15: / Line 15: @@
 * parity (odd, even, none)
-could only be set with [[switch]]es. A group of [[jumper]]s allowed configuration of separate input and output baud rates (75 to 9600) for each group.
+could only be set with a pair of [[DIP switch]]es. A group of [[jumper]]s allowed configuration of separate input and output baud rates (75 to 9600) for each group.
 A 'break' condition on the line (i.e. continuous assertion) could also be generated and detected.
@@ Line 115: / Line 115: @@
 * [http://www.bitsavers.org/pdf/dec/unibus/EK-DJ11-MM-003_DJ11_Maint_Man_Aug76.pdf DJ11 asynchronous 16-line multiplexer maintenance manual] (EK-DJ11-MM-003)
-[[Category: UNIBUS Serial Interfaces]]
+[[Category: UNIBUS Asynchronous Serial Interfaces]]

@@ Line 1: / Line 1: @@
-The '''DJ11 asynchronous serial line interface''' is a [[UNIBUS]] [[peripheral]] which provides up to 16 [[asynchronous serial line]]s. Both input and output used [[programmed I/O]] (with separate receive and transmit [[interrupt]]s). On input, a 64-character [[First-In First-Out buffer|FIFO buffer]] made over-runs unlikely. [[Modem]]s were not supported.
+The '''DJ11 Asynchronous 16-Line Multiplexer''' is a [[UNIBUS]] [[peripheral]] which provides up to 16 [[asynchronous serial line]]s. Both input and output used [[programmed I/O]] (with separate receive and transmit [[interrupt]]s). On input, a 64-character [[First-In First-Out buffer|FIFO buffer]] made over-runs unlikely. [[Modem]]s were not supported.
-It was less flexible than, and not as efficient as, the roughly contemporaneous [[DH11 asynchronous serial line interface|DH11]].
+It was less flexible than, and not as efficient as, the roughly contemporaneous [[DH11 asynchronous serial line interface|DH11]]. It was effectively replaced by the [[DZ11 asynchronous serial line interface|DZ11]], which was cheaper (it was a single [[DEC card form factor|hex]] [[printed circuit board|board]]), and more flexible.
 The DJ11 allowed support of either all [[20mA current loop serial line interface|20mA]] or all [[EIA RS-232 serial line interface|EIA RS-232]] serial lines, by means of a dual-width level converter board. The versions of the DJ11 were:
@@ Line 10: / Line 9: @@
 * DJ11-AC - EIA level conversion
-The parameters for each line:
+The parameters for each group of four lines:
 * character length (5-8 bits)
-* stop bits (1, 1-1/2 and 2)
+* stop bits (1 and 2)
 * parity (odd, even, none)
-could only be set with [[jumper]]s, in groups of four lines. A 'break' condition on the line (i.e. continuous assertion) could also be generated and detected.
+could only be set with [[switch]]es. A group of [[jumper]]s allowed configuration of separate input and output baud rates (75 to 9600) for each group.
-Another group of jumpers allowed configuration of the input FIFO level at which an input interrupt occurred; choices were: 1, 5, 9, 17, or the sum of all selections (up to 32).
+A 'break' condition on the line (i.e. continuous assertion) could also be generated and detected.
 ==Device registers==
@@ Line 36: / Line 34: @@
 |Break Control and Status Register    || DJBCSR || 760014
 |}
 ===760010: Control and Status Register (DJCSR)===
@@ Line 70: / Line 67: @@
 * M7285 - Mux control (hex)
-* M7279 - Receive silo (dual)
+* M7279 - Receive silo
 * M7280 (2) - Octal [[Asynchronous serial line#UART|UARTs]] (quad)
 * [[M782 Interrupt Control‎|M7821]] - Interrupt control
 * [[M105 Address Selector|M105]] - Address selection
 The -AA, -AB and -AC versions of the DJ11 also included one:
@@ Line 106: / Line 105: @@
 The -AC used an H317-A distribution panel, which had screw connectors.
 [[Category: UNIBUS Serial Interfaces]]
 [[Category: DEC Asynchronous Serial Interfaces]]

← Older revision		Revision as of 13:55, 17 August 2022
Line 108:		Line 108:

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

@@ Line 98: / Line 98: @@
 | 4 || colspan="2" style="text-align:center;" | UNIBUS Out || colspan="4" style="text-align:center;" | M7280 Octal UART
 |}
 ===Distribution panels===

← Older revision		Revision as of 22:11, 23 September 2019
Line 20:		Line 20:

	Another group of jumpers allowed configuration of the input FIFO level at which an input interrupt occurred; choices were: 1, 5, 9, 17, or the sum of all selections (up to 32).		Another group of jumpers allowed configuration of the input FIFO level at which an input interrupt occurred; choices were: 1, 5, 9, 17, or the sum of all selections (up to 32).
		+
		+	==Device registers==
		+
		+	{\| border=1
		+	! Register !! Abbreviation !! Address
		+	\|-
		+	\|Control and Status [[Register]] \|\| DJCSR \|\| 760010
		+	\|-
		+	\|Receive Buffer Register \|\| DJRBUF \|\| 760012
		+	\|-
		+	\|Transmit Control Register \|\| DJTCR \|\| 760014
		+	\|-
		+	\|Transmit Buffer Register \|\| DJTBUF \|\| 760016
		+	\|-
		+	\|Break Control and Status Register \|\| DJBCSR \|\| 760014
		+	\|}
		+
		+
		+	===760010: Control and Status Register (DJCSR)===
		+	{{16bit-header}}
		+	\| TRDY \|\| TIE \|\| FFO \|\| SEN \|\| Unused \|\| RWBR \|\| Unused \|\| MTSE \|\| DONE \|\| RIE \|\| Unused \|\| BCLR \|\| MCLR \|\| MAINT \|\| HDSEL \|\| REN
		+	{{16bit-bitout}}
		+
		+	===760012: Receive Buffer Register (DJRBUF)===
		+	{{16bit-header}}
		+	\| CHPR \|\| ORUN \|\| FRERR \|\| PERR \|\| colspan=4 style="text-align:center;" \| Line \|\| colspan=8 style="text-align:center;" \| Received Char
		+	{{16bit-bitout}}
		+
		+	===760014: Transmit Control Register (DJTCR)===
		+	{{16bit-header}}
		+	\| colspan=16 \| CHL15 <---> CHL00
		+	{{16bit-bitout}}
		+
		+	===760016: Transmit Buffer Register (DJTBUF)===
		+	{{16bit-header}}
		+	\| colspan=4 style="text-align:center;" \| Unused \|\| colspan=4 style="text-align:center;" \| Line \|\| colspan=8 style="text-align:center;" \| Transmitted Char
		+	{{16bit-bitout}}
		+
		+	===760014: Break Control and Status Register (DJBCSR)===
		+	{{16bit-header}}
		+	\| colspan=16 \| BKL15 <---> BKL00
		+	{{16bit-bitout}}
		+
		+	To read/write the BCSR register, bit 10 of the CSR is set.

	==Implementation==		==Implementation==

← Older revision	Revision as of 00:34, 24 November 2022
(No difference)

@@ Line 1: / Line 1: @@
-The '''DJ11 asynchronous serial line interface''' is a [[UNIBUS]] [[peripheral]] which provides up to 16 [[asynchronous serial line]]s. Both input and output used [[programmed I/O]]; on input a 64-character [[First-In First-Out buffer|FIFO buffer]] made over-runs unlikely. [[Modem]]s were not supported.
+The '''DJ11 asynchronous serial line interface''' is a [[UNIBUS]] [[peripheral]] which provides up to 16 [[asynchronous serial line]]s. Both input and output used [[programmed I/O]] (with separate receive and transmit [[interrupt]]s). On input, a 64-character [[First-In First-Out buffer|FIFO buffer]] made over-runs unlikely. [[Modem]]s were not supported.
 It was less flexible than, and not as efficient as, the roughly contemporaneous [[DH11 asynchronous serial line interface|DH11]].
 It was effectively replaced by the [[DZ11 asynchronous serial line interface|DZ11]], which was cheaper (it was a single [[DEC card form factor|hex]] [[Printed circuit board|board]]), and more flexible.
-The DJ11 allowed support of either all [[20mA current loop serial line interface|20mA]] or all [[EIA RS-232 serial line interface|EIA RS-232]] serial lines, by means of a dual-width level converter board. The parameters for each line:
+The DJ11 allowed support of either all [[20mA current loop serial line interface|20mA]] or all [[EIA RS-232 serial line interface|EIA RS-232]] serial lines, by means of a dual-width level converter board. The versions of the DJ11 were:
 * separate input and output baud rates (75 to 9600)
@@ Line 12: / Line 18: @@
 could only be set with [[jumper]]s, in groups of four lines. A 'break' condition on the line (i.e. continuous assertion) could also be generated and detected.
 ==Implementation==
-The implementation took a single custom [[system unit]] [[backplane]], containing multiple cards (see list below).
+The implementation took a single custom [[system unit]] [[backplane]], containing multiple cards:
 * M7285 - Mux control (hex)
 * M7279 - Receive silo (dual)
-* M7280 (2) - Multiple UARTs (quad)
+* M7280 (2) - Octal [[Asynchronous serial line#UART|UARTs]] (quad)
-* [[M7821]] - Interrupt control
+* [[M782 Interrupt Control‎|M7821]] - Interrupt control
-* [[M105]] - Address selection
+* [[M105 Address Selector|M105]] - Address selection
 The -AA, -AB and -AC versions of the DJ11 also included one:
@@ Line 42: / Line 38: @@
 respectively, which occupied a dual slot.
 ===Distribution panels===
-The rack-mounted passive distribution panel used in the -AA EIA version was the H317-B distribution panel, which mounted directly into a standard 19" rack, and contained 16 DB-25P connectors. It was connected to the DJ11 with a pair of BC08S cables, which carried the 'main' signals (data, etc - i.e. non-modem control).
+The rack-mounted passive distribution panel used in the -AA EIA version was the H317-B distribution panel (the same as used by the DH11), which mounted directly into a standard 19" rack, and contained 16 DB-25P connectors. It was connected to the DJ11 with a pair of BC08S cables, which carried the 'main' signals (data, etc - i.e. non-modem control).
 The -AC used an H317-A distribution panel, which had screw connectors.
 [[Category: UNIBUS Serial Interfaces]]