DosDevConfig

This call gets information about attached devices.

DosDevConfig (DeviceInfo, Item, Parm)

• DeviceInfo (PVOID) - output: Address of the byte-wide field containing the requested information.
• Item (USHORT) - input: Device information requested.
  • 0 - Number of printers attached
  • 1 - Number of RS232 ports
  • 2 - Number of diskette drives
  • 3 - Presence of math coprocessor (where 0 = not present, 1 = present)
  • 4 - PC Submodel Type (where the return is the system submodel byte)
  • 5 - PC Model Type (where the return is the system model byte)
  • 6 - Display adapter type (where 0 = monochrome mode compatible, 1 = other).
• Parm (USHORT) - input: Reserved for future use and should be set to zero.

rc (USHORT) - return:Return code descriptions are:

• 0 NO_ERROR
• 87 ERROR_INVALID_PARAMETER

The system model (function 5) and submodel (function 4) information is obtained from BIOS.

In addition, the number of devices attached in a PS/2 environment reflect only devices that are “awake”. Devices that are “asleep” are not counted.

  #define INCL_DOSDEVICES
 
  USHORT  rc = DosDevConfig(DeviceInfo, Item, Parm);
 
  PVOID   DeviceInfo;    /* Returned information */
  USHORT  Item;          /* Item number */
  USHORT  Parm;          /* Reserved */
 
  USHORT  rc;            /* return */

  EXTRN  DosDevConfig:FAR
  INCL_DOSDEVICES     EQU 1
 
  PUSH@  OTHER   DeviceInfo  ;Requested information (returned)
  PUSH   WORD    Item        ;Item number
  PUSH   WORD    Parm        ;Reserved (must be zero)
  CALL   DosDevConfig

Returns WORD

This example gets information about model type, monitor and coprocessor and display it.

  #define INCL_DOSDEVICES
 
  #define MACHINE_MODEL 5
  #define DISPLAY_TYPE 6
  #define FIND_COPROCESSOR 3
  #define RESERVED 0L
 
  BYTE   DeviceInfo;
  USHORT rc;
 
     if(!DosDevConfig(&DeviceInfo,          /* Returned information */
                      MACHINE_MODEL,        /* Item number */
                      RESERVED))            /* Reserved */
        printf("Model Type %d ",DeviceInfo);
 
     if(!DosDevConfig(&DeviceInfo,          /* Returned information */
                      DISPLAY_TYPE,         /* Item number */
                      RESERVED))            /* Reserved */
        if (DeviceInfo)
           printf("Colour display ");
        else
           printf("Mono display ");
 
     if(!DosDevConfig(&DeviceInfo,          /* Returned information */
                      FIND_COPROCESSOR,     /* Item number */
                      RESERVED))            /* Reserved */
        if (DeviceInfo)
           printf("Coprocessor");
        else
           printf("No Coprocessor");

Text based on http://www.edm2.com/index.php/DosDevConfig_(Legacy)