Int E0  - Real/32 - "dev_setflag" - Set System Flag                        [O]

   CL = 85h
   DX = system flag ID

Return: AX = status (0000h success, else error code)

Note:  REAL/32 returns an error if the flag was already set, which indicates
     that a previous logical interrupt has not yet been serviced

See Also: INT E0/CL=84h