Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!mit-eddie!uw-beaver!blake!erf
From: erf@blake.acs.washington.edu (John Firestone)
Newsgroups: comp.sys.dec
Subject: PDP-11 movb instruction
Keywords: PDP-11 movb instruction device register
Message-ID: <2592@blake.acs.washington.edu>
Date: 28 Jun 89 22:06:50 GMT
Organization: Univ of Washington, Seattle
Lines: 11

I am designing a Q-bus controller and have come upon a PDP-11
architecture question which I hope someone can answer.  If
a MOVB instruction writes the low byte of a word-oriented device
register, what does the high byte get set to?

Thanks in advance for your help.

John Firestone               glug@geops.geo.washington.edu
Geophysics Program, AK-50
University of Washington     (206) 543-0162
Seattle, WA  98195