DR11-L general-purpose interface
From Computer History Wiki
File:DR11-L.jpeg
DR11-L board
The DR11-L general-purpose interface was a UNIBUS device controller which provided a pair of 16-bit parallel ports, both input-only. It was a quad format card (M7864), and used an SPC slot; it used programmed I/O.
Connection to the user's device is via a pair of 40-pin Berg connectors; each is controlled by a separate set of registers (identical for the two connectors).
The DR11-L is roughly an input-only version of the earlier DR11-C general device interface, but is not program compatible with the DR11-C.
