INT 16 - 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 AMIAmerican Megatrends, Inc.(American Megatrends, Inc.) A hardware, software and firmware company founded in 1985. BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. 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) SeeAlso: AX=F401h,AX=F402h