13 Feb
2009
13 Feb
'09
3:23 p.m.
Subject: Re: 8088 vs. 80c88
From: Chris M <chrism3667 at yahoo.com>
Date: Fri, 13 Feb 2009 08:10:34 -0800 (PST)
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
regardless, and be sure I am no expert on semiconductor manufacturing, I'd be
surprised to find out that all 8088's were CMOS after a certain date. The 80c88's
were used mostly in small laptops, no?
No they wer eused in many stationary apps wherelow power was desired.
(small being anything smaller then that Zenith big honker, w/the shocking blue display. It
used a *real* 8088 IINM). A CMOS version would be slower and more prone to damage from
static electricity. And it would require less power. Off the top of my head I can't
think of any desktops that used them, but I may have actually ran into 1 or 2 in my
travels.
They were not slower, most were as fast or faster. I have a few here. 10mhz and 12mhz
parts along with 80C188s (12 and 16mhz).
Allison
?But I am glad you managed to answer your own question
Jimbo :)
--- On Thu, 2/12/09, Jim Leonard <trixter at oldskool.org> wrote:
From: Jim Leonard <trixter at oldskool.org>
Subject: Re: 8088 vs. 80c88
To: General at mail.mobygames.com, "On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
Date: Thursday, February 12, 2009, 2:49 PM
Jim Leonard wrote:
So a simple routine to try to identify the 8088
vs. the 80c88 would look something like:
???mov? ???cx,2? ? ? ? ? ? ; test if following instruction will be
? ? ? ? ? ? ? ? ? ? ? ? ???; repeated twice.
???db? ? ? 0F3h,26h,0ACh???; rep es: lodsb
???jcxz? ? Yes? ? ? ? ? ???; intel non-CMOS chips do not care of rep
???jmp? ???Nope? ? ? ? ? ? ; before segment prefix override, NEC and
? ? ? ? ? ? ? ? ? ? ? ? ???; CMOS-tech ones does.
It turns out my information is bad.? The bug only asserts itself when an interrupt occurs
during the REP.? Buggy CPUs don't continue; later ones do.? So to fix my detection
code, I will increase the count in cx to something much longer, probably f000.
-- Jim Leonard (trixter at oldskool.org)? ? ? ? ? ? http://www.oldskool.org/
Help our electronic games project:? ? ? ? ???http://www.mobygames.com/
Or check out some trippy MindCandy at? ???http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
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