VAX-11's compatibility mode

[Henry Spencer]

Actually, a friend who got one of the first 780's outside DEC, and had
DEC people working with them for a while getting it running, mentioned
one other thing that compatibility mode doesn't support:  the MARK
instruction.  This omission is (I believe) undocumented, but it's not
surprising that nobody has noticed the absence of the most useless
instruction ever added to the 11...
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry