Device Driver for TU81 + flame!

[Chris Maltby]

When given the commission to write a TU80 driver for SYSV, I too
approached DEC about it, and was given all sorts or rubbish until
finally I spoke to someone who knew a bit about the subject, who taold
me that the TU80 and TS11 are identical except for some obscure error
returns and possibly error recovery techniques. I then compared TU80
and TS11 manuals and couldn't find any practical difference. Needless
to say, my TU80 driver worked first time...

The TU81 is a TU80 with higher density available: no worries, it's
such a simple change to make it select 6250 for the right minor
number.

Chris Maltby
Ex Neology Ltd