Difference between revisions of "DR11-B parallel interface"

From Computer History Wiki
Jump to: navigation, search
m (Implementation: update)
(Implementation: Add boards locs)
Line 21: Line 21:
  
 
The M7219 is a [[DEC card form factor|quad]] card; the others are all single. (The M796 and M7821 are [[DEC card form factor|extended length]]; the others are all standard length.)
 
The M7219 is a [[DEC card form factor|quad]] card; the others are all single. (The M796 and M7821 are [[DEC card form factor|extended length]]; the others are all standard length.)
 +
 +
Board locations (as seen from the board insertion side of the backplane, not the [[wire-wrap]] pin side, as it common in [[DEC]] documentation) are:
 +
 +
{| class="wikitable"
 +
! !! colspan="6" | Connector
 +
|-
 +
! Slot !! A !! B !! C !! D !! E !! F
 +
|-
 +
| 1 || colspan="2" style="text-align:center;" | UNIBUS In || colspan="4" style="text-align:center;" | M7219 Bus Interface
 +
|-
 +
| 2 || colspan="2" style="text-align:center;" | Test board || M208 || M208 || M7821 || M796
 +
|-
 +
| 3 || Power connector || M205 || M611 || M611 || M112 || M113
 +
|-
 +
| 4 || colspan="2" style="text-align:center;" | UNIBUS Out || colspan="2" | User connector || M116 || M239
 +
|}
  
 
Connection to the user device is via either a pair of M957 Split-Lug Cable boards, or via an M9760 (dual) Twisted Pair Cable Connector board. The M9680 (dual) board is a loopback test board, which can be used in place of the user connection board(s).
 
Connection to the user device is via either a pair of M957 Split-Lug Cable boards, or via an M9760 (dual) Twisted Pair Cable Connector board. The M9680 (dual) board is a loopback test board, which can be used in place of the user connection board(s).

Revision as of 20:16, 4 June 2017

The DR11-B was a parallel interface for the UNIBUS which used DMA to transfer data.

Implementation

It was constructed from a number of smaller Flip Chips which were installed in custom 4-slot system unit backplane. The extant DR11-B documentation does not show either the modules used in the DR11-B, or their locations in the backplane.

The modules are:

  • M112 - 10 x 2-input NOR gates
  • M113 - 10 x 2-input NAND gates
  • M116 - 6 x 4-input NOR gates
  • M205 - 5 x 'D' flip flops
  • 2 x M208 - 8-bit buffer / shift-register
  • M239 - 3 x 4-bit counter/register
  • 2 x M611 - High speed power inverters
  • M796 - UNIBUS Master Control
  • M7821 - Interrupt Control
  • M7219 - Bus Interface

The M239's are used to hold the Status and Command Register.

The M7219 is a quad card; the others are all single. (The M796 and M7821 are extended length; the others are all standard length.)

Board locations (as seen from the board insertion side of the backplane, not the wire-wrap pin side, as it common in DEC documentation) are:

Connector
Slot A B C D E F
1 UNIBUS In M7219 Bus Interface
2 Test board M208 M208 M7821 M796
3 Power connector M205 M611 M611 M112 M113
4 UNIBUS Out User connector M116 M239

Connection to the user device is via either a pair of M957 Split-Lug Cable boards, or via an M9760 (dual) Twisted Pair Cable Connector board. The M9680 (dual) board is a loopback test board, which can be used in place of the user connection board(s).