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- From: coolidge@sirius.aux.apple.com (John L. Coolidge)
- Newsgroups: comp.sys.mac.hardware,comp.sys.ibm.pc.hardware
- Subject: Re: P5 v. PowerPC (WAS: Where the mac really wins)
- Message-ID: <1992Dec14.235202.2336@times.aux.apple.com>
- Date: 14 Dec 92 23:52:02 GMT
- References: <gf_L=Z200Vp=8UNwxz@andrew.cmu.edu>
- Sender: news@times.aux.apple.com (News Subsystem)
- Reply-To: coolidge@apple.com
- Organization: Open Systems Development, Porting&I/O Group, Apple Computer, Inc.,Summary:
- Lines: 39
-
- fj05+@andrew.cmu.edu (Faisal Nameer Jawdat) writes:
- >wagner@grace.math.uh.edu (David Wagner) writes:
- >> This is just my two bits, and it is said in hindsight, but if Apple were
- >> to make this kind of arrangement today, I would say that they ought
- >> to use the Alpha chip. From what I know of it, (which ain't all that
- >> much) it seems ideal for emulations. If it can run OSF and VMS, then
- >> (IMHO) it ought to be able to do `Mac' and MC680XX pretty well. Of
- >> course then we'd all have to be 64-bit clean, I guess.
-
- >The Alpha doesn't have to emulate anything to run OSF or VMS because
- >unix is hardware independent, while VMS only runs on the VAX
- >instruction set, which the Alpha implements a superset of.
-
- To echo what another poster said, the Alpha does not implement
- anything like a superset of the VAX instruction set. It's a completely
- new architecture. There are a few things thrown in which make
- implementing some VAX features somewhat easier, but not that much.
-
- The Alpha doesn't run VMS, either. It runs OpenVMS, which is a port of
- VMS to the Alpha architecture. It doesn't emulate existing VAX-based
- VMS code (nor does it emulate VAX or MIPS-based Ultrix code).
-
- However, the Alpha probably could have a pretty good MC680x0 emulator
- (and a good 80x86 emulator). It's a nice fast chip; you could probably
- do pure emulation (no recompiled toolbox code, etc) at about Q700
- performance. However, as I said in an earlier point, I doubt Apple
- would be at all interested in the current generation of Alpha chips --
- they cost way too much for PC's. Most likely DEC couldn't hit the
- price point needed for PC's any sooner than Apple/IBM/Motorola will
- with the PowerPC family, and they might wind up running slower anyway.
-
- --John
-
- Let your mind go, and your body will follow.
- -- _L.A._Story_
-
- +++John L. Coolidge++++++++++++++++coolidge@apple.com+++++++++++++++++++++++
- I speak for myself, not for Apple Computer. Copyright 1992 John L. Coolidge.
- Copying allowed only if attributed, and if all copies may be further copied.
-