Int 21/AX=4403h

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MS-DOS 7.0+ - CONFIG$ device - SET??? CONFIGURATION INFORMATION

AX = 4403h
BX = file handle for character device "CONFIG$"
CX = number of bytes to write
DS:DX -> buffer containing ???

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

Note: IOCTL Output to CONFIG$ is only available while IO.SYS is booting the system; once CONFIG.SYS has been processed, this call always succeeds, ignoring any input

See Also: AX=4403h"CONFIG$"

Category: DOS Kernel - Int 21h - M

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