Get Version

Returns the version number of the DPMI Specification
implemented by the DPMI host.  Clients can use this
information to determine whicH Fn 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
   CL     = processor type
           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:

o  Under DPMI hosts, the major version number is returned in
   DH and the minor version number is returned in DL. 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, DH is returned as 0, and DL is returned as
   decimal 90 (5AH). In hypothetical DPMI version 2.3, DH
   would be returned as 2 and DL would be returned as 30
   (1EH).