Int 21/AX=4402h

MS-DOS 7.0+ - CONFIG$ device - GET CONFIGURATION INFORMATION

AX = 4402h
BX = file handle for character device "CONFIG$"
CX = number of bytes to read (at least 5)
DS:DX -> buffer for ??? data (see #01444)

Return:
CF clear if successful
AX = number of bytes actually read
CF set on error
AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)

See Also: AX=4403h"CONFIG$"


Format of MS-DOS 7.0 CONFIG$ ??? data:

Offset  Size    Description     (Table 01444)
00h    WORD    ??? (0000h)
02h    WORD    ??? (0000h or value read from IO.SYS segment 70h)
04h    BYTE    ??? (value read from IO.SYS segment 70h)

Category: DOS Kernel - Int 21h - M

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