Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

                                                     ◄Up► ◄Next► ◄Previous►
────────────────────────────────────────────────────────────────────────────
 
include vmm.inc
 
VMMcall Get_Machine_Info
mov     [Major], AH         ; MS-DOS major version number
mov     [Minor], AL         ; MS-DOS minor version number
mov     [OEM], BH           ; MS-DOS OEM serial number
mov     [Model], BL         ; machine model byte
mov     [Type], EBX         ; machine type flags (high-order 16-bits)
mov     [SysConf], ECX      ; points to System Configuration Parameters
mov     [Equip], EDX        ; equipment flags
 
The Get_Machine_Info service returns information about the computer system
that Windows is running on.
 
This service has no parameters.
 
Return Value
 
The AX, EBX, ECX, and EDX registers contain the following information:
 
Register  Description
────────────────────────────────────────────────────────────────────────────
AH        MS-DOS major version number
 
AL        MS-DOS minor version number
 
BH        MS-DOS OEM serial number
 
BL        Machine model byte (from address F000:FFFE in system ROM)
 
EBX       Machine type flags (in the high-order 16-bits) as follows:
 
          Value       Meaning
          ──────────────────────────────────────────────────────────────────
          GMIF_80486  80486 processor
 
          GMIF_PCXT   PCXT accelerator
 
          GMIF_MCA    Micro Channel
 
          GMIF_EISA   EISA
 
ECX       Ring 0 linear address to System Configuration Parameters (as
          returned from BIOS service Interrupt 15h, AH=C0h) Applies only to
          PS/2 or computers with extended BIOS. See the PS/2 BIOS
          documentation for details.
 
EDX       Equipment flags (as returned from Interrupt 11h)
 
Comments
 
The address returned in the ECX register points to a copy of the system
configuration parameters because the actual parameters may have been moved
into a buffer which is subject to page remapping.
 
Uses
 
EAX, EBX, ECX, EDX, Flags
 
                                      ♦