DH11 asynchronous serial line interface - Revision history

Jnc: dab EMI

2025-02-13T10:31:12Z

dab EMI

Jnc: New cat scheme

2023-02-19T00:27:41Z

New cat scheme

Larsbrinkhoff: I'm adding DH11 to SIMH; SITS needs it.

2022-10-15T20:14:01Z

I'm adding DH11 to SIMH; SITS needs it.

Jnc: New cat

2022-08-17T13:54:17Z

New cat

Jnc: link UART

2022-01-31T00:41:08Z

link UART

Jnc: typo

2022-01-13T09:53:17Z

typo

Jnc: /* External links */ +Eng Drw, manuals

2022-01-13T09:50:36Z

‎External links: +Eng Drw, manuals

Jnc: /* Later implementations */ DHU11 not in fact program compatible

2020-12-31T09:52:37Z

‎Later implementations: DHU11 not in fact program compatible

Jnc: /* Main unit */ +M791 Berg conn card

2020-01-31T17:46:20Z

‎Main unit: +M791 Berg conn card

Jnc: link to dist panel page

2019-10-11T13:53:13Z

link to dist panel page

@@ Line 163: / Line 163: @@
 [[Image:H3007Panel.jpg|thumb|right|200px|H3007]]
-Later, the H3007 8-line EIA distribution panel, designed for use in later DEC cabinets with improved [[EMI]] characteristics, was introduced; the H3007 fits into the standard panel 21cm x 10cm cutout found in these systems.
+Later, the H3007 8-line EIA distribution panel, designed for use in later DEC cabinets with improved EMI [[interference]] characteristics, was introduced; the H3007 fits into the standard panel 21cm x 10cm cutout found in these systems.
 ==Design flaw==

← Older revision		Revision as of 00:27, 19 February 2023
Line 186:		Line 186:
	* [http://woffordwitch.com/McNamaraDH11.asp The Development Of The DH11 Multiplexer]		* [http://woffordwitch.com/McNamaraDH11.asp The Development Of The DH11 Multiplexer]

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

@@ Line 37: / Line 37: @@
 |Break Control Register                 || DHBRCR || 760034
 |-
-|Silo Status Register                   || DHSSR || 760034
+|Silo Status Register                   || DHSSR || 760036
 |}
@@ Line 57: / Line 57: @@
 {{16bitoctal-bitout}}
-===760034: Silo Status Register (DHSSR)===
+===760036: Silo Status Register (DHSSR)===
 {{16bit-header}}
 | Rsvd || Unused || colspan=6 | Fill || colspan=2 | XMem || colspan=6 | Alarm

← Older revision		Revision as of 13:54, 17 August 2022
Line 187:		Line 187:

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

@@ Line 103: / Line 103: @@
 * M7279 - FIFO buffer
-* M7280 (2) - Octal UARTs
+* M7280 (2) - Octal [[Universal Asynchronous Receiver/Transmitter|UART]]s
 and a number of single-width cards:

@@ Line 182: / Line 182: @@
 * [http://www.bitsavers.org/pdf/dec/unibus/EK-ODH11-OP-002_DH11_Asynchronous_16-line_Multiplexer_Users_Manual_Sep76.pdf DH11 asynchronous 16-line multiplexer user's manual] (EK-ODH11-OP-002)
-* [http://www.bitsavers.org/pdf/dec/unibus/EK-0DH11-MM-003_Apr75.pdf DH11 asynchronous 16-line multiplexer maintenance manual (EK-ODH11-MM-003)
+* [http://www.bitsavers.org/pdf/dec/unibus/EK-0DH11-MM-003_Apr75.pdf DH11 asynchronous 16-line multiplexer maintenance manual] (EK-ODH11-MM-003)
 * [http://www.bitsavers.org/pdf/dec/unibus/DH11_EngrDrws_Jul76.pdf DH11 Engineering Drawings]
 * [http://woffordwitch.com/McNamaraDH11.asp The Development Of The DH11 Multiplexer]
 [[Category: UNIBUS Serial Interfaces]]

@@ Line 175: / Line 175: @@
 ==Later implementations==
-The DH11 was later re-implemented as the [[DHU11]], which was mostly programmatically identical, but fitted on a single [[DEC card form factor|hex-height]] card, which plugged into a [[Modified UNIBUS Device|MUD]] slot.
+The DH11 was later re-implemented as the [[DHU11 asynchronous serial line interface|DHU11]], which was not programmatically identical to the DH11, but had the same capabilities. (It also had the input timer, discussed above.) It fitted on a single [[DEC card form factor|hex-height]] card, which plugged into a [[Modified UNIBUS Device|MUD]] slot.
-For the [[QBUS]], the [[DHV11]] and [[DHQ11]] (again, programmatically identical) appeared; they only supported 8 lines (via two quad breakout panels) each, however.
+For the [[QBUS]], the [[DHV11 asynchronous serial line interface|DHV11]] and [[DHQ11 asynchronous serial line interface|DHQ11]] (the former was mostly programmatically identical to the DHU11; the latter could be set to exactly emulate either a DHU11 or a DHV11) appeared; they only supported 8 lines each (via two quad breakout panels), however.
 ==External links==

@@ Line 90: / Line 90: @@
 ===Main unit===
 The 'basic' DH11 included the following [[DEC card form factor|hex-width]] boards:
@@ Line 110: / Line 112: @@
 * [[M782 Interrupt Control‎|M7821]] (2) - Interrupt control (transmit. receive, and [[Non-Processor Request|NPR]])
 * M405 - Baud clock (optional; 2)
 Board locations (as seen from the board insertion side of the backplane, not the [[wire-wrap]] pin side, as is common in [[DEC]] documentation) are:

@@ Line 64: / Line 64: @@
 ==Initial implementation==
-The original implementation took an entire double [[system unit]], containing multiple cards (see list below). It came in 'earlier' and 'later' versions.
+The original implementation took an entire double [[system unit]] [[backplane]], containing multiple cards (see list below). It came in 'earlier' and 'later' versions.
-In the 'early' versions, modular 'line conditioning' units allowed support of either [[20mA current loop serial line interface|20mA]] or [[EIA RS-232 serial line interface|EIA RS-232]] serial lines; these were installed in a separate rack-mounted [[DEC card form factor|dual-height]] DM11-AA distribution panel [[backplane]] (which required its own independent [[power supply]]); details are in the [[DM11-BB Modem Control Option‎|DM11-BB]] page.
+In the 'early' versions, modular 'line conditioning' units allowed support of either [[20mA current loop serial line interface|20mA]] or [[EIA RS-232 serial line interface|EIA RS-232]] serial lines; these were installed in a separate rack-mounted [[DEC card form factor|dual-height]] [[DM11 distribution panel]] [[backplane]] (which required its own independent [[power supply]]).
 [[Image:H317BUncovered.jpg|thumb|right|300px|H317-B with cover off]]
-In the 'later' units, to reduce the cost, line conditioning was performed by a board mounted in the main DH11 backplane, and a rack-mounted passive H317-B distribution panel provided connectors for individual lines.
+In the 'later' units, to reduce the cost, line conditioning was performed on boards mounted in the main DH11 backplane, and a rack-mounted passive H317-B distribution panel provided connectors for individual lines.
 These 'later' versions only supported EIA-type line conditioning (with or without modem control); to add modem control, a different implementation of the DM11-BB was required (one which did the EIA level conversion on the control lines internally).