Table of Contents

Note: This API call is for DOS and Win16 personality only. Use Family API for portability.

2018/09/07 05:04 · prokushev · 0 Comments

Int 21H, AH=44H, AL=06H

Version

2 and higher

Brief

GET INPUT STATUS

Family API

Input

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)

Macro

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

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

Note

Text based on Ralf Brown Interrupt List Release 61

2018/09/04 17:23 · prokushev · 0 Comments