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; on input a 64-character FIFO buffer made over-runs unlikely. Modems were not supported.
- 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.
The versions of the DJ11 were:
- DJ11-AA - EIA level conversion
- DJ11-AB - No level conversion (TTL levels)
- DJ11-AC - EIA level conversion
The DJ11 included the following boards:
- M7285 - Mux control (hex)
- M7279 - Receive silo (dual)
- M7280 (2) - Multiple 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.
The rack-mounted passive distribution panel used in the -AA EIA version was the H317-B distribution panel, 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.