Assembly sample source codes

MSDOS 2.00 Function Library for Lattice C

MSDOS 2.00 Function Library for Lattice C

subttl -
;;
;;FUNCTION:	Sets and returns switch char-
;;	acter and device availability.
;;
;;
;;CALL:
;;
;;	ret= _charop(al,dl)
;;	int ret;	DL return value, 
;;	int al;		charoper function
;;	int dl;		charoper data
;;
;;RETURN:
;;	See the DOS docs for details. 
;;_charop(0,0) returns the ASCII switch char,
;;_charop(1,'-') sets the switch to -,
;;_charop(2,0) returns device availability,
;;_charop(3,i) sets device availability.
;;
;;
;;DESCRIPTION:
;;
;;EXAMPLE:
;;
;;
;;CAUTIONS:
;;
;;
;;ASSUMPTIONS:
;;
;;LONG	32 bits (4 bytes)
;;INT	16 bits (2 bytes)
;;CHAR	 8 bits (1 byte)
;;
page
pgroup group prog
prog segment byte public 'prog'
assume cs:pgroup,ds:pgroup

public 	_charop

_charop proc near
	push	bp
	mov	bp,sp
	mov	al,[bp+4]
	mov	dl,[bp+6]
	mov	ah,55
	int	33
	mov	al,dl
	mov	ah,0
	pop	bp
	ret
_charop endp

prog ends

	end

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