Int 16/AX=F400h

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Compaq Systempro and higher - CACHE CONTROLLER STATUS

AX = F400h

Return:
AH = E2h (*) AL = status 00h not present 01h enabled 02h disabled CX = cache memory size

bit 15:
Cache size information is NOT valid

bits 14-0:
Cache memory size in kilobytes. DH = cache write technology

bit 7:
Cache write information is NOT valid

bits 6-1:
Reserved (0)

bit 0:
0 = Write-through caching 1 = Write-back caching. DL = cache type

bit 7:
Cache type information is NOT valid

bits 6-1:
Reserved (0)

bit 0:
0 = Direct mapped 1 = Two-way set-associative

Notes: Also supported by some versions of AMI BIOS dated June 1992 or later. Many (most) BIOSes return a modified AH when called for an unsupported or non-keyboard function (typically, the highest supported keyboard function [normally 12h] is subtracted from the original AH)

See Also: AX=F401h - AX=F402h

Category: Vendor-specific BIOS Extensions - Int 16h - C

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