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AX = 4406h BX = file handle
Return:
CF clear if successful AL = input status 00h not ready (device) or at EOF (file) FFh ready AH may be destroyed (refer to note) CF set on error AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)
Notes: Files may not register as being at EOF if positioned there by AH=42h. Under DOS 5.0, on a successful return, AH contains either the next character which will be read or 1Ah if at EOF; under a Windows95 DOS box, AH seems to be either unchanged or 00h. This function was not supported by Digital Research's DOS Plus
BUG: The CLOCK$ device under DR DOS 3.41 always indicates 'Ready'; this was corrected in v5.0
See Also: AX=4407h - INT 2F/AX=122Bh
Category: DOS Kernel - Int 21h - D
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