Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!bellcore!texbell!texsun!newstop!sun!imagen!atari!portal!portal!cup.portal.com!mslater
From: mslater@cup.portal.com (Michael Z Slater)
Newsgroups: comp.sys.m68k
Subject: Re: CALLM and RTM ( was: Re: 68040 not object code compatible?
Message-ID: <27504@cup.portal.com>
Date: 3 Mar 90 18:31:00 GMT
References: <4975@scolex.sco.COM> <2609@uklirb.informatik.uni-kl.de>
Organization: The Portal System (TM)
Lines: 14

>From article <4975@scolex.sco.COM>, by seanf@sco.COM (Sean Fagan):
>> 
>> Only one member of the 68k family implements the CALLM (and RETM)
>> instructions:  the 68020.  Nobody used it, apparantly, so it was dropped by
>> the time the '30 came out.
>> 
>I remember on Electrica '88 a man from Motorola told me that CALLM and RTM
>where included because of a specific customer ( he didn't tell me which one )
>and that this customer then did not use these instructions. So they where
>left out later on.

I believe that this customer was Apollo.

Michael Slater, Microprocessor Report   mslater@cup.portal.com