Int 16/AX=F400h

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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