Re: chip compatibility

Michael Lorrey (
Mon, 02 Feb 1998 23:38:43 -0500

Anton Sherwood wrote:

> : Harvey Newstrom <> wrote:
> : >Yes, backward compatibility is a sham. x86 chips are not compatible
> : >with Pentium are not compatible with MMX, etc. Macs have the same
> : >problem. The 86xxx motorola chips are not compatible with the PowerPC
> : >chips. MacOS won't be compatible with Rhapsody.
> Jeff Fabijanic writes
> : Untrue. I have never encountered, nor have I ever heard of anyone
> : who has encountered, a valid 680x0 (not 86xxx, btw) instruction
> : that did not run correctly on a PPC chip (albeit in emulation).
> For whatever it's worth, my old versions of Word (4) and Excel (3?)
> bomb on my new PPC - illegal instruction. They being MS products,
> I would not be surprised to learn they use undocumented instructions
> which are not emulated.

The PPC is a 32 bit chip, no? What OS? I assume that your Word app is the
Apple version, since Word was not made in a 4.0 version for Windows. So
Microsoft's application is running undocumented instructions on the Mac OS?
Apparently MS isn't the only bear in the woods.

   Michael Lorrey
------------------------------------------------------------ Inventor of the Lorrey Drive
MikeySoft: Graphic Design/Animation/Publishing/Engineering
How many fnords did you see before breakfast today?