More ENABLE/34 Info...

[utzoo!duke!decvax!ucbvax!Mike at BRL]

From:      Mike at BRL
The ENABLE implements a UNIBUS Map, just like the 11/70.
UNIX has the routines mapalloc() and mapfree() which
manage the map -- this mapping is for NPR I/O only, and
operates independently of the Kernel/User address maps.

Ie:  UNIX can pretend that the machine is an 11/70 --
except that some of the registers are at different places,
and a few extra lines of assembler are needed in the machine
assist startoff section.  Really most convienient.
			-M