PC11 High-Speed Paper-Tape Reader/Punch Control

The PC11 is the UNIBUS device controller for the PC05 paper tape high-speed reader/punch. It uses programmed I/O, with interrupts when it is ready for/with more data.

There are two versions, both of which plug into an SPC slot. The first is a dual card, the M781, which is used with an M105 Address Selector and an M782 Interrupt Control (both tall singles). The second is a single quad board, the M7810.

A pair of cables (one for the reader, one for the punch - to support reader-only or punch-only options) connect it to the device. The cables are different between the two versions of the PC11; the first has H807 connectors on the side of the card into which small PCBs with plated contact fingers plug; the second version uses a pair of female-shell/male-pin Berg connectors.

Registers

The two versions are programming-compatible. The device has four control registers, which can be configured to any four sequential word locations in the I/O page; it is normally configured to addresses 777550-777556:

Register	Abbreviation	Address
Paper-Tape Reader Status Register	PRS	777550
Paper-Tape Reader Buffer Register	PRB	777552
Paper-Tape Punch Status Register	PPS	777554
Paper-Tape Punch Buffer Register	PPB	777556

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

Reader Status Register (PRS)

ERR	Unused			BUSY	Unused			DONE	INT ENB	Unused					RDR ENB
15	14	13	12	11	10	09	08	07	06	05	04	03	02	01	00

Reader Buffer Register (PRB)

Unused								Input Data
15	14	13	12	11	10	09	08	07	06	05	04	03	02	01	00

Punch Status Register (PPS)

ERR	Unused							RDY	INT ENB	Unused
15	14	13	12	11	10	09	08	07	06	05	04	03	02	01	00

Punch Buffer Register (PPB)

Unused								Output Data
15	14	13	12	11	10	09	08	07	06	05	04	03	02	01	00

The PPB does not respond to 'read' cycles on the UNIBUS.