DB11-A Bus Repeater - Revision history

Jnc: Harness for use in BA11's with DEC power distribution connectors

2023-03-27T16:19:59Z

Harness for use in BA11's with DEC power distribution connectors

Jnc: /* External links */ Capitalization as given/used in the original

2023-03-27T11:29:14Z

‎External links: Capitalization as given/used in the original

Ashlin4010: /* External links */

2023-03-27T08:50:05Z

‎External links

Ashlin4010: /* External links */

2023-03-27T08:49:33Z

‎External links

Jnc: +External links - manual

2022-01-10T17:07:27Z

+External links - manual

Jnc: improve wording

2018-12-24T21:47:07Z

improve wording

Jnc: All the basics

2018-12-24T20:22:01Z

All the basics

New page

The '''DB11-A Bus Repeater''' allows a [[UNIBUS]] to double the number of [[peripheral]]s connected to the [[bus]] (in terms of the combined [[analog]] load). It [[terminator|terminates]] the first section of the bus, and active [[digital]] logic repeats all the signals though onto the second section (or from the second back to the first, when required); the two sections are thus logically connected, but are not in purely analog terms.

It consists of a custom [[system unit]] [[backplane]], holding a number of smaller [[FLIP CHIP]]s; mostly [[DEC card form factor|singles]] (see table below), with one dual (M7213).

{| class="wikitable"
! Type !! Count || Function
|-
| M783 || 1 || Bus driver
|-
| M784 || 1 || Bus receiver
|-
| M785 || 4 || Bus transceiver
|-
| M7212 || 3 || Address buffer
|-
| M7213 || 1 || Buffer master
|-
| M7248 || 1 || BBSY repeater
|-
| M930 || 2 || UNIBUS terminator
|}

Board locations (as seen from the board insertion side of the backplane, not the [[wire-wrap]] pin side, as is common in [[Digital Equipment Corporation|DEC]] documentation) are:

{| class="wikitable"
! !! colspan="6" | Connector
|-
! Slot !! A !! B !! C !! D !! E !! F
|-
| 1 || colspan="2" style="text-align:center;" | UNIBUS A In || M7248 || M7212 || M7212 || M7212
|-
| 2 || colspan="2" style="text-align:center;" | UNIBUS A termination || colspan="2" style="text-align:center;" | Unused || M784 || M783
|-
| 3 || Power || Unused || colspan="2" style="text-align:center;" | M7213 || M785 || M785
|-
| 4 || colspan="2" style="text-align:center;" | UNIBUS B Out || colspan="2" | UNIBUS B termination || M785 || M785
|}

[[Category: UNIBUS]]

@@ Line 38: / Line 38: @@
 | 4 || colspan="2" style="text-align:center;" | UNIBUS B Out || colspan="2" | UNIBUS B termination || M785 || M785
 |}
 ==External links==
 * [http://www.bitsavers.org/pdf/dec/unibus/EK-DB11A-TM-002_DB-11A_Bus_Repeater_Manual_Aug74.pdf DB11-A bus repeater manual] - (EK-DB11A-TM-002)
-* [http://www.bitsavers.org/pdf/dec/unibus/DB11-A_RevS_Engineering_Drawings_Jan76.pdf DB11-A Engineering Drawings ] - Various bus drivers, repeaters and terminators
+* [http://www.bitsavers.org/pdf/dec/unibus/DB11-A_RevS_Engineering_Drawings_Jan76.pdf DB11-A Engineering Drawings] - Various bus drivers, repeaters and terminators
 [[Category: UNIBUS]]

@@ Line 41: / Line 41: @@
 ==External links==
-* [http://www.bitsavers.org/pdf/dec/unibus/EK-DB11A-TM-002_DB-11A_Bus_Repeater_Manual_Aug74.pdf DB11-A Bus Repeater Manual] - (EK-DB11A-TM-002)
+* [http://www.bitsavers.org/pdf/dec/unibus/EK-DB11A-TM-002_DB-11A_Bus_Repeater_Manual_Aug74.pdf DB11-A bus repeater manual] - (EK-DB11A-TM-002)
 * [http://www.bitsavers.org/pdf/dec/unibus/DB11-A_RevS_Engineering_Drawings_Jan76.pdf DB11-A Engineering Drawings ] - Various bus drivers, repeaters and terminators
 [[Category: UNIBUS]]

@@ Line 42: / Line 42: @@
 * [http://www.bitsavers.org/pdf/dec/unibus/EK-DB11A-TM-002_DB-11A_Bus_Repeater_Manual_Aug74.pdf DB11-A Bus Repeater Manual] - (EK-DB11A-TM-002)
-* [http://www.bitsavers.org/pdf/dec/unibus/DB11-A_RevS_Engineering_Drawings_Jan76.pdf DB11-A Engineering Drawings ] - Various bus drivers repeaters and terminators
+* [http://www.bitsavers.org/pdf/dec/unibus/DB11-A_RevS_Engineering_Drawings_Jan76.pdf DB11-A Engineering Drawings ] - Various bus drivers, repeaters and terminators
 [[Category: UNIBUS]]

@@ Line 41: / Line 41: @@
 ==External links==
-* [http://www.bitsavers.org/pdf/dec/unibus/EK-DB11A-TM-002_DB-11A_Bus_Repeater_Manual_Aug74.pdf DB-11A bus repeater manual] (EK-DB11A-TM-002)
+* [http://www.bitsavers.org/pdf/dec/unibus/EK-DB11A-TM-002_DB-11A_Bus_Repeater_Manual_Aug74.pdf DB11-A Bus Repeater Manual] - (EK-DB11A-TM-002)
 [[Category: UNIBUS]]

← Older revision		Revision as of 21:47, 24 December 2018
Line 1:		Line 1:
−	The '''DB11-A Bus Repeater''' allows a [[UNIBUS]] to double the number of [[peripheral]]s connected to the [[bus]] (in terms of the combined [[analog]] load). It [[terminator\|terminates]] the first section of the bus, and active [[digital]] logic repeats all the ~~signals~~ though onto the second section (or from the second back to the first, when required); the two sections are thus logically connected, but ~~are~~ not in purely analog terms.	+	The '''DB11-A Bus Repeater''' allows a [[UNIBUS]] to double the number of [[peripheral]]s connected to the [[bus]] (in terms of the combined [[analog]] load).
		+
		+	It [[terminator\|terminates]] (in analog terms) the first section of the bus, and active [[digital]] [[logic]] repeats all the [[signal]]s though onto the second section (or from the second back to the first, when required); the two sections are thus logically connected, but not in purely analog terms.

	It consists of a custom [[system unit]] [[backplane]], holding a number of smaller [[FLIP CHIP]]s; mostly [[DEC card form factor\|singles]] (see table below), with one dual (M7213).		It consists of a custom [[system unit]] [[backplane]], holding a number of smaller [[FLIP CHIP]]s; mostly [[DEC card form factor\|singles]] (see table below), with one dual (M7213).