Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!ucsd!ucrmath!rhyde
From: rhyde@ucrmath.ucr.edu (randy hyde)
Newsgroups: comp.sys.apple2
Subject: Re: Multitasking on a II
Message-ID: <10620@ucrmath.ucr.edu>
Date: 15 Dec 90 06:22:40 GMT
References: <11297.apple.net@pro-angmar>
Organization: University of California, Riverside
Lines: 7

>> the 8088 and subsequent processor...have had.. (an) instruction that
>> CANNOT .. be preempted.

So did the 6502, Z80, etc.  ASL and LSR will do the job just find.
As I pointed out earlier, a non-preemptible instruction is not necessary
to prevent two processes from entering a critical region.
*** Randy Hyde