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1 messages
1 total messages Started by ucbvaxarpavaxwnj Thu, 27 Aug 1981 18:05
performance of async interfaces
#4
Author: ucbvaxarpavaxwnj
Date: Thu, 27 Aug 1981 18:05
13 lines
720 bytes
the able dmax works just fine.
others are too new for final word on them, although many have had problems
with early cs11s; emulex has fixed most of these problems.

on vax, we see following overheads for output at 9600 baud with reasonably
long lines (i.e. not all characters require special processing):
	dz-11	5%
	dh-11	3%
this of a 11/780 processor.  the dz-11 uses pseudo-dma.  on 32/v pre
pseudo-dma one 9600 baud line was > 100%, i.e. you couldn't drive one
line at full 9600.

	bill joy
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