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 the controller to the device. The cables are different between the two versions of the PC11; the first has H807 connectors on the side of the controller card, into which small PCBs with plated contact fingers plug; the second version uses BC08J cables, with a pair of female-shell/male-pin Berg connectors on the controller card.
Contents
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.
