no significant bugs in 80286 virtual memory

[David Schachter]

Daisy's "DNIX" operating system is a virtual memory operating system
for the '286.  It has been around since mid 1985 and works fine.

The only chip problem was a problem with the flags byte being trashed
when attempts are made to write to read-only segments.  This prevented
us from emulating dirty bits by marking data read-only until the first
attempted write.

DNIX is a segment-swapping virtual memory operating system, with 
support built into the (real-time) kernel for window management and
networking.  Not bad, for a '286.  (It also runs on the 8086, but 
without virtual memory, and much slower.)

By the way, I'm writing this from an 80386 system running DNIX XV5.0.10,
rlogin to a VAX 750 running 4.2 bsd Unix.

				-- David Schachter