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AH = C9h AL = 10h (may be required on some non-PS BIOSes)
Return:
CF clear if successful AH = 00h CH = CPU type (see #00528) CL = mask revision (stepping level) (see #00529) CF set on error AH = status (80h,86h = function not supported)
Notes: The BIOS must save DX at startup in order to be able to support this call; PS/2 Models 56, 57, 90, and 95 are known to support it. The PS/2 BIOS merely reads CMOS locations 190h (type) and 191h (rev). IBM classifies this function as optional
See Also: AX=D100h - AX=DA92h - MEM 0040h:00BCh
(Table 00528) Values for CPU type: 03h 80386DX or clone 04h 80486 05h Pentium 23h 80386SX or clone 33h Intel i376 43h 80386SL or clone A3h IBM 386SLC A4h IBM 486SLC
(Table 00529) Values for stepping level: ---i376 (type code 33h)--- 05h A0 08h B ---80386/80386DX (type code 03h)--- 03h Intel B1 to B10, Am386DX/DXL step A 05h Intel D0 08h Intel D1/D2/E1, Am386DX/DXL step B ---80386SL (type code 43h)--- 05h A 1xh B ---80386SX (type code 23h)--- 04h Intel A0 05h Intel B, Am386SX/SXL step A1 08h Intel C/D1, Am386SX/SXL step B 09h Intel 386CX/386EX/386SXstatic step A ---80486DX (type code 04h)--- 00h Intel A0/A1 01h Intel B2 to B6 02h Intel C0 03h Intel C1 04h Intel D0 10h Intel cA2/cA3, Cx486SLC step A 11h Intel cB0/cB1 ---486DX2 (type code 04h)--- 02h Am486DX2 (unknown stepping) 32h Intel DX2/Overdrive steps A0 to A2 33h Intel DX2/Overdrive step B1 ---486SX (type code 04h)--- 20h Intel A0 22h Intel B0 27h Intel cA0 28h Intel cB0 ---486SL (type code 04h)--- 40h Intel A ---IntelSX2 (type code 04h)--- 5xh Intel A ---IntelDX4 (type code 04h)--- 8xh Intel A ---487SX (type code 04h)--- 20h Intel A0 21h Intel B0 ---Pentium (type code 05h)--- 0xh Intel P5 steps Ax (1993) 1xh Intel P5 steps Bx (1994) 2xh Intel P54C step A ---RapidCAD (type code 03h)--- 40h A
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