4.1bsd vs. Versatec V80

[Dave Martindale]

The 4.1BSD driver for the Versatec DOES do DMA.  It allocates the UBA in
the strategy routine and releases it there, rather than using the more
complex ubago/ubadone interface of the disk and tape drivers, but it
is definitely not character-by-character.  Now, has anyone looked into
why it transfers data so slowly?  It was something over 30 microseconds
per transfer last time I checked.