Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!aero-c!gumby.dsd.trw.com!deneva!knurlin
From: knurlin@spf.trw.com (Scott Karlin)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Instructions on 68000
Message-ID: <28063915.180D@deneva.sdd.trw.com>
Date: 12 Apr 91 22:47:49 GMT
References: <4577@orbit.cts.com>
Sender: news@deneva.sdd.trw.com
Organization: TRW Data Systems Center, Redondo Beach, CA
Lines: 23

In article <4577@orbit.cts.com> koleman@pnet51.orb.mn.org (Kurt "Koleman" Koller) writes:
>
>Ok, I was looking at some source in Assembly, and I saw some instructions that
>I wasn't familiar with.  My assembler (Macro 68) assembles them just fine, and
>they ARE mentioned in the 68000 manual, but just MENTIONED.  I have no idea
>what they do.  If anyone can help me, so be it.
> 
>                st       (MemoryLocation)
>                sne      d(n)
>                sf
>                sge
These are examples of the Scc (Set According to Condition) instructions.
If the condition specified by "cc" is true then the byte operand is set
to all bits 1, otherwise all bits 0.  The conditions specified by your
four examples are:  always true, not equal, never true, & greater or
equal.  This information can be found in the "8-/16-/32-Bit Microprocessors
User's Manual"  ISBN: 0-13-567074-8.


-- Scott Karlin                    knurlin@spf.trw.com
-- TRW Data Systems Center         Phone: (213) 812-7335
-- One Space Park, O2-1761
-- Redondo Beach, CA 90278-1071