Method for distinguishing between a 386-type central processing

Details Method for distinguishing between a 386-type central processing Method for distinguishing between a 386-type central processing

1995-05-23

1996-02-06

Coleman, Eric

Boots, shoes, and leggings

364247, 3642592, 3642598, 3642328, 364DIG1, G06F 1578

Patent

active

054902673

ABSTRACT:
A method is disclosed for distinguishing between the Intel 80386 and 80286 CPUs. Bits 12, 13, and 14 of the 386 flags word in the real mode are always zero in the 286 architecture and cannot be set, but can be set to a one on the 386. The method includes the steps of attempting to set any of those bits and examining the results. A source code listing is attached.

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CPU.ASM 14 Apr. 1988 9:15 a.m. (real date purportedly Nov. 13, 1987) 4 pages.
CPUID.ASM 24 Nov. 87 9:58 p.m., 33 pages.
CPUID.ASM 17 Feb. 86 3:23 p.m., 15 pages.
CPUID.DES 14 Apr. 88 10:36 a.m., 4 pages.
CPU.TYPE.ASM 26 Mar. 86 6:52 p.m., 1 page.
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INTEL ID.ASM 26 Mar. 86 6:53 p.m., 1 page.
IS386.ASM 11 Mar. 86 5:44 p.m., 1 page.
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