Path: utzoo!censor!geac!torsqnt!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!ssbell!mcmi!dsndata!wayne From: wayne@dsndata.uucp (Wayne Schlitt) Newsgroups: comp.sys.m68k Subject: Re: 68040 not object code compatible? Message-ID: Date: 25 Feb 90 17:35:49 GMT References: <300003@hpclkms.HP.COM> Sender: wayne@dsndata.UUCP Organization: Design Data Lines: 20 In-reply-to: ken@hpclkms.HP.COM's message of 23 Feb 90 21:57:39 GMT In article <300003@hpclkms.HP.COM> ken@hpclkms.HP.COM (Ken Sumrall) writes: > > [ ... ] > In the table on page A-3, the CALLM instruction is shown to be implemented > only on the 68020. However, on page 1-1, the 68040 is claimed to be > user object code compatible with previous members of the 68000 family. > it is my understanding that motorola went out and looked and found _no_one_ who was actually using the CALLM and RTM instructions. i am sure that there are people who did use them, but none of the major compilers or operating systems do. i dont think this is going to be a major problem. first, the 68000 and the 68020 were not 100% user object code compatible either. (the MOVE SR instruction became privileged...) secondly, the '030 doesnt have the CALLM instruction either so this is really old news. -wayne