DR11-K parallel interface

DR11-K board

The DR11-K general device interface was a UNIBUS device controller, very similar in functionality to the DR11-C parallel interface, but with more robust analog interface specifications.

Like the DR11-C, it provided a pair of 16-bit parallel ports, one input, and one output; and used an SPC slot. It also used programmed I/O. It was, however, a hex format card (M7843)

Connection to the user's device is via a pair of 40-pin Berg connectors.

Registers

The device has three control and buffer registers, which can be configured to any three sequential word locations in the I/O page; the first DR11-K is normally configured to addresses 767770-767774:

Register	Abbreviation	Address
Status Register	DRSR	767770
Input Buffer Register	DROUTBUF	767772
Output Buffer Register	DRINBUF	767774

The order of input and output buffer registers is inverted from that of the DR11-C, for unknown reasons.

In the register contents (below), bits which are read/write or unused are shown in normal font, those which are write-only are in italics.

Status Register (DRSR)

OUT FLAG	OUT INTR ENB	SET INTR OUT	Unused					IN FLAG	IN INTR ENB	SET INTR IN	Unused
15	14	13	12	11	10	09	08	07	06	05	04	03	02	01	00

Output Buffer Register (DROUTBUF)

OUT15 <-> OUT0
15	14	13	12	11	10	09	08	07	06	05	04	03	02	01	00

Input Buffer Register (DRINBUF)

IN15 <-> IN0
15	14	13	12	11	10	09	08	07	06	05	04	03	02	01	00