----- Original Message ----- From: "Warner Losh via cctalk" <cctalk@classiccmp.org> To: "Murray McCullough" <c.murray.mccullo...@gmail.com>; "General Discussion: On-Topic and Off-Topic Posts" <cctalk@classiccmp.org> Sent: Thursday, January 04, 2018 1:05 PM Subject: Re: Spectre & Meltdown
> On Thu, Jan 4, 2018 at 11:00 AM, Murray McCullough via cctalk < > cctalk@classiccmp.org> wrote: > >> This may be off-topic but these latest uprocessor exploits has raised >> a question: Are the 'old/classic' uprocessors using x86 technology in >> the same boat? The very earliest ones, i.e., 1970s and early 80's. >> probably not. How many are actually in use and/or on the Net? >> > > I've seen it reported, but haven't verified, that this bug extends about 20 > years back in the past to the Pentium Pro/Pentium II class of machines. If > I read that correctly, there's only two generations of Pentium not > affected, the P54C and P55C, the former of F00F fame... 386 and 486 CPUs > apparently aren't affected since they didn't have speculative execution. > The 8088/8086/80186/80286 presumably are also immune... If you extend > things further back, CP/M on Z80/8080 is also fine, but I don't think those > are properly x86 :) > > Warner -------- Finally, an excuse to use all those old 486 boxes... m
