Get Version

Returns the version number of the DPMI Specification implemented by the DPMI host. Clients can use this information to determine which function calls are supported in the current environment.

Call With

AX = 0400H

Returns

Carry flag = clear (this function always succeeds)
AH = DPMI major version as a binary number
AL = DPMI minor version as a binary number
BX = flags

Bits Significance

0 0 = host is 16-bit DPMI implementation

1 = host is 32-bit (80386) DPMI implementation

1 0 = CPU returned to Virtual 86 mode for reflected interrupts

1 = CPU returned to real mode for reflected interrupts

2 0 = virtual memory not supported

1 = virtual memory supported

3 reserved, for historical reasons

4-15 reserved for later use

Bits	Significance
0	0 = host is 16-bit DPMI implementation
1 = host is 32-bit (80386) DPMI implementation
1	0 = CPU returned to Virtual 86 mode for reflected interrupts
1 = CPU returned to real mode for reflected interrupts
2	0 = virtual memory not supported
1 = virtual memory supported
3	reserved, for historical reasons
4-15	reserved for later use

CL = processor type

Value Significance

02H 80286

03H 80386

04H 80486

05H-FFH reserved for future Intel processors

Value	Significance
02H	80286
03H	80386
04H	80486
05H-FFH	reserved for future Intel processors

DH = current value of virtual master PIC base interrupt
DL = current value of virtual slave PIC base interrupt

Notes

Under DPMI hosts, the major version number is returned in AH and the minor version number is returned in AL. There are two decimal digits for the minor version number with the least-significant digit representing the revision number of the minor version number. Under DPMI version 0.9 hosts, AH is returned as 0, and AL is returned as decimal 90 (5AH). In hypothetical DPMI version 2.3, AH would be returned as 2 and AL would be returned as 30 (1EH).