Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!rutgers!cbmvax!grr From: grr@cbmvax.UUCP (George Robbins) Newsgroups: comp.sys.m68k,comp.sys.amiga Subject: Re: MC68020, Versions, and the Amiga Message-ID: <2195@cbmvax.UUCP> Date: Mon, 10-Aug-87 13:32:30 EDT Article-I.D.: cbmvax.2195 Posted: Mon Aug 10 13:32:30 1987 Date-Received: Tue, 11-Aug-87 04:45:44 EDT References: <5930001@hplsla.HP.COM> <963@oakhill.UUCP> <704@elmgate.UUCP> Reply-To: grr@cbmvax.UUCP (George Robbins) Organization: Commodore Technology, West Chester, PA Lines: 27 Xref: mnetor comp.sys.m68k:542 comp.sys.amiga:7298 In article <704@elmgate.UUCP> jdg@aurora.UUCP (Jeff Gortatowsky) writes: > I hope someone at Motorola or Commodore can help me with this..... > > First. I have a XC68020RC12 and an MC68881RC12A. What does that mean? > Umm... what I mean is, is XC a bad omen? The 881 seems to be a production > version. The XC indicates that the part is an engineering or pre-production sample. Typically, there is an errata sheet associated with the mask level that documents thing that do not work correctly or timing differences from the official specifications. It may work fine in your application, or may not. > Ok,ok, what's the point? I'd like to take the two (020 & 881) and put them > on a proto board and replace the '010 in my Amiga with them (at 7.16mhz). > A). Can anyone give me a schematic for doing this? > B). Is my CPU any good? If not what's it's problem? Can I 'trade' it > in on a 'good' one? What's 'XC' mean? Xperimental? Well, CSA has apparently has a couple of boards, one at 7 MHz and one at 14 MHz that would do what you want, although they're probably a bit pricy. There was mention here of a board from Europe that might work also. The origen of most of this stuff is a Motorola applications note that describes how to make a 68020 look like a 68000. Contact you local Motorola office for a copy. -- George Robbins - now working for, uucp: {ihnp4|seismo|rutgers}!cbmvax!grr but no way officially representing arpa: cbmvax!grr@seismo.css.GOV Commodore, Engineering Department fone: 215-431-9255 (only by moonlite)