DJ11 asynchronous serial line interface
The DJ11 asynchronous serial line interface is a UNIBUS peripheral which provides up to 16 asynchronous serial lines. Both input and output used programmed I/O (with separate receive and transmit interrupts). On input, a 64-character FIFO buffer made over-runs unlikely. Modems were not supported.
- DJ11-AA - EIA level conversion
- DJ11-AB - No level conversion (TTL levels)
- DJ11-AC - EIA level conversion
The parameters for each line:
- separate input and output baud rates (75 to 9600)
- character length (5-8 bits)
- stop bits (1, 1-1/2 and 2)
- parity (odd, even, none)
could only be set with jumpers, in groups of four lines. A 'break' condition on the line (i.e. continuous assertion) could also be generated and detected.
Another group of jumpers allowed configuration of the input FIFO level at which an input interrupt occurred; choices were: 1, 5, 9, 17, or the sum of all selections (up to 32).
|Control and Status Register||DJCSR||760010|
|Receive Buffer Register||DJRBUF||760012|
|Transmit Control Register||DJTCR||760014|
|Transmit Buffer Register||DJTBUF||760016|
|Break Control and Status Register||DJBCSR||760014|
760010: Control and Status Register (DJCSR)
760012: Receive Buffer Register (DJRBUF)
760014: Transmit Control Register (DJTCR)
|CHL15 <---> CHL00|
760016: Transmit Buffer Register (DJTBUF)
760014: Break Control and Status Register (DJBCSR)
|BKL15 <---> BKL00|
To read/write the BCSR register, bit 10 of the CSR is set.
- M7285 - Mux control (hex)
- M7279 - Receive silo (dual)
- M7280 (2) - Octal UARTs (quad)
- M7821 - Interrupt control
- M105 - Address selection
The -AA, -AB and -AC versions of the DJ11 also included one:
- M5901 EIA conversion module
- M5900 TTL 'conversion' module
- M5902 20mA conversion module
respectively, which occupied a dual slot.
|1||UNIBUS In||M105||M7821||M7279 Receive Silo|
|2||M7285 Mux Control|
|3||M7280 Octal UART|
|4||UNIBUS Out||M7280 Octal UART|
The unit is powered via a standard 9-pin connector.
The rack-mounted passive distribution panel used in the -AA EIA version was the H317-B distribution panel (the same as used by the DH11), which mounted directly into a standard 19" rack, and contained 16 DB-25P connectors. It was connected to the DJ11 with a pair of BC08S cables, which carried the 'main' signals (data, etc - i.e. non-modem control).
The -AC used an H317-A distribution panel, which had screw connectors.