View source for DR11-B parallel interface

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 Chip]]s 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 - NOR gates
* M113 - 10 x 2-input NAND gates
* M116 - NOR gates
* M205 - 5 x 'D' flip flops
* M208 - 8-bit buffer / shift-register
* M239 - Status and Command Register
* 2 x M611 - High speed power inverters
* M796 - UNIBUS Master Control
* M7821 - Interrupt Control
* M7219 - Bus Interface

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

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).