DR11 parallel interface

The DR11s were a series of parallel interfaces for the UNIBUS. Some used DMA, others were programmed I/O.

They included:

• DR11-A: programmed I/O, quad SPC slot
• DR11-B: DMA, 4-slot system unit
• DR11-C: single-board replacement for the DR11-A
• DR11-K: similar functionality to the DR11-C, more robust user device interface
• DR11-L: double input-only
• DR11-M: double output-only
• DR11-W: hex single-board replacement for the DR11-B

See also

• DRV11 parallel interface

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