Modified UNIBUS Device - Revision history

Jnc: Move Engineering Drawings for individual backplanes to individual pages

2023-03-30T14:06:53Z

Move Engineering Drawings for individual backplanes to individual pages

Ashlin4010: /* External links */

2023-03-27T08:46:56Z

‎External links

Ashlin4010: /* See also */

2023-03-27T08:42:28Z

‎See also

Ashlin4010: /* See also */

2023-03-27T08:39:03Z

‎See also

Ashlin4010 at 08:25, 27 March 2023

2023-03-27T08:25:46Z

Jnc: +See also

2022-01-10T12:27:38Z

+See also

Jnc: update names for backplane pages

2019-01-18T22:25:51Z

update names for backplane pages

Jnc: new cat

2018-11-17T21:01:34Z

new cat

Jnc: Add links, clarify some points

2018-10-17T20:32:03Z

Add links, clarify some points

Jnc: Content moved

2017-12-17T01:13:38Z

Content moved

@@ Line 73: / Line 73: @@
 ==See also==
 * [[Extended UNIBUS]]
 * [[:Category:UNIBUS_Backplanes|UNIBUS Backplanes]]
 * [[G727_grant_continuity_card|G727 Grant Continuity Card]]
 * [[G7273_grant_continuity_card|G7273 Grant Continuity Card]]
 [[Category: UNIBUS]]

@@ Line 80: / Line 80: @@
 ==External links==
 * [http://www.bitsavers.org/pdf/dec/unibus/DD11-B_RevE_Engineering_Drawings_Feb74.pdf DD11-B Engineering Drawings ]
 * [http://www.bitsavers.org/pdf/dec/unibus/DD11-C_RevB_Engineering_Drawings_May77.pdf DD11-C Engineering Drawings ] - DD11-CK and DD11-CF wiring harness requirements can be found on pages 5 & 7
 * [http://www.bitsavers.org/pdf/dec/unibus/DD11-D_RevC_Engineering_Drawings_Feb77.pdf DD11-D Engineering Drawings ] - DD11-DK and DD11-DF wiring harness requirements can be found on pages 6 & 7
 * [http://www.bitsavers.org/pdf/dec/unibus/DD11-P_RevD_Engineering_Drawings_Feb77.pdf DD11-P Engineering Drawings ]
 {{PDP-11}}
 [[Category: UNIBUS]]

@@ Line 75: / Line 75: @@
 * [[Extended UNIBUS]]
 * [[:Category:UNIBUS_Backplanes|UNIBUS Backplanes]]
 ==External links==

@@ Line 74: / Line 74: @@
 * [[Extended UNIBUS]]
+* [[:Category:UNIBUS_Backplanes|UNIBUS Backplanes]]
 ==External links==

@@ Line 74: / Line 74: @@
 * [[Extended UNIBUS]]
 {{PDP-11}}
 [[Category: UNIBUS]]

@@ Line 70: / Line 70: @@
 * BE2 - BG4
 * BV2 - Ground
 {{PDP-11}}
 [[Category: UNIBUS]]

@@ Line 9: / Line 9: @@
 Technically, a MUD slot only describes the A-B [[DEC edge connector contact identification|connectors]]; most backplanes also provided SPC functionality in the C-F connectors (needed for signals for [[interrupt]]s or [[Direct Memory Access|DMA]], for devices which did those), with most UNIBUS signals present in both; the combination is sometimes called a 'MUD/SPC' slot.
-The [[DD11-C]] (4-slot) and [[DD11-D]] (9-slot) and later backplanes generally provided MUD slots, not the earlier SPC slots; however, generally the slots in these later backplanes are MUD/SPC - other than the entrance and exit slots, which have normal two-slot UNIBUS in/out in A-B, and SPC in C-F.
+The [[DD11-C backplane|DD11-C]] (4-slot) and [[DD11-D backplane|DD11-D]] (9-slot) and later backplanes generally provided MUD slots, not the earlier SPC slots; however, generally the slots in these later backplanes are MUD/SPC - other than the entrance and exit slots, which have normal two-slot UNIBUS in/out in A-B, and SPC in C-F.
 ==Grants==

← Older revision		Revision as of 21:01, 17 November 2018
Line 73:		Line 73:
	{{PDP-11}}		{{PDP-11}}

−	[[Category: ~~DEC Buses~~]]	+	[[Category: UNIBUS]]

@@ Line 3: / Line 3: @@
 It differed from the older [[Small Peripheral Controller|SPC]] slot in that it was a hex-height slot, and used the pins (in the [[DEC edge connector contact identification|A-B connectors]]) to carry UNIBUS signals - mostly pin-compatible with the original dual UNIBUS slot, but there were a few important differences.
-The most important was that since the standard UNIBUS dual connector only contains one pin per grant (suitable only for an 'in' or 'out' UNIBUS connector), not separate 'grant in' and 'grant out' pins (as on the [[QBUS]]), a full-function UNIBUS slot is not possible with only two connectors. The MUD connectors therefore do not contain grants; those pins were recycled for other functions.
+The most important was that since the standard UNIBUS dual connector only contains one pin per [[bus grant line]] (suitable only for an 'in' or 'out' UNIBUS connector), not separate 'grant in' and 'grant out' pins (as on the [[QBUS]]), a full-function UNIBUS slot is not possible with only two connectors. The MUD connectors therefore do not contain grants; those pins were recycled for other functions.
-Some re-assigned pins contain a number of lines for communication between a parity controller, and parity-capable memory boards plugged into that backplane; others carry additional voltages (primarily for core memory).
+Some re-assigned pins contain a number of lines for communication between a [[parity]] controller, and parity-capable [[main memory]] boards plugged into that backplane; others carry additional [[voltage]]s (primarily for [[core memory]]).
-Technically, a MUD slot only describes the A-B connectors; most backplanes also provided SPC functionality in the C-F conectors (needed for signals for interrupts or DMA, for devices which did those), with most UNIBUS signals present in both; the combination is sometimes called a 'MUD/SPC' slot.
+Technically, a MUD slot only describes the A-B [[DEC edge connector contact identification|connectors]]; most backplanes also provided SPC functionality in the C-F connectors (needed for signals for [[interrupt]]s or [[Direct Memory Access|DMA]], for devices which did those), with most UNIBUS signals present in both; the combination is sometimes called a 'MUD/SPC' slot.
-The [[DD11-C]] (4-slot) and [[DD11-D]] (9-slot) and later backplanes generally provided MUD slots, not the earlier SPC slots; however, generally the slots in these later backplanes are MUD/SPC - other than the entrance and exit slots, which have normal two-slot UNIBUS in/out in A-B.
+The [[DD11-C]] (4-slot) and [[DD11-D]] (9-slot) and later backplanes generally provided MUD slots, not the earlier SPC slots; however, generally the slots in these later backplanes are MUD/SPC - other than the entrance and exit slots, which have normal two-slot UNIBUS in/out in A-B, and SPC in C-F.
 ==Grants==
@@ Line 17: / Line 17: @@
 A board plugged into a MUD/SPC slot generally had a header which routed the grant (and matching request) line for the desired priority level to the on-board interrupt circuity, and passed the other grant lines through.
-The DMA (NPG) grant line generally had a jumper on the backplane, which had to be removed if a DMA device was plugged into the slot. Un-occupied slots needed to have a grant continuity card installed.
+The DMA (NPG) grant line generally had a jumper on the backplane, which had to be removed if a DMA device was plugged into the slot.
 ==Added signals==
@@ Line 23: / Line 25: @@
 The added lines for communication between a parity controller and parity-capable memory boards were Parity Detect (used to let memory boards know that a parity controller is present); Internal SSYN (used by memory boards to let the parity controller know that their data is ready); and Parity P0 and Parity P1 (parity data).
-The additional voltages were + and -15V, -5V, and +20V.
+The additional voltages were + and -15V, -5V, and +20V. Note that in some machines (the [[PDP-11/44]] and [[PDP-11/24]]) the +15V/-15 pins actually contain +12V/-12V, for use by the [[MS11-M MOS memory]] card, which needs those voltages. +15V/-15V are available in the SPC portion of some such slots.
 ===Pinout===
@@ Line 70: / Line 72: @@
 {{PDP-11}}

@@ Line 1: / Line 1: @@
 '''Modified UNIBUS Device''' or '''MUD''' was [[DEC]]'s name for an I/O board slot in the [[backplane]]s of [[UNIBUS]] [[PDP-11]]s. It was a [[DEC card form factor|hex]] slot, and could hold any kind of device.
-It differed from the older [[Small Peripheral Controller|SPC]] slot in that it was a hex-height slot, and used the pins (in the [[DEC card form factor#Edge connector contact identification|A-B connectors]]) to carry UNIBUS signals - mostly pin-compatible with the original dual UNIBUS slot, but there were a few important differences.
+It differed from the older [[Small Peripheral Controller|SPC]] slot in that it was a hex-height slot, and used the pins (in the [[DEC edge connector contact identification|A-B connectors]]) to carry UNIBUS signals - mostly pin-compatible with the original dual UNIBUS slot, but there were a few important differences.
 The most important was that since the standard UNIBUS dual connector only contains one pin per grant (suitable only for an 'in' or 'out' UNIBUS connector), not separate 'grant in' and 'grant out' pins (as on the [[QBUS]]), a full-function UNIBUS slot is not possible with only two connectors. The MUD connectors therefore do not contain grants; those pins were recycled for other functions.