;
;	-- Typical Assembly language subroutines --
;
; FILL - Fill 'CX' locations with 'AL' starting at (BX).
;	 Return: BX = BX + CX; DX saved.
;
FILL:	PUSH	DX		;Save DX
	MOV	DL,AL		;Save char in DL
	JCXZ	#1		;Just return if CX == 0
;
	MOV	[BX],DL		;Fill first location
	MOV	DX,BX		;Move BX to DX
	INC	DX		;DX is Move destination
	DEC	CX		;Account for one filled pos
	CALL	MOVEBC		;Fill is overlapped block-move
	MOV	BX,DX		;BX-> past last fill
#1:	POP	DX
	RET
;
; CONVUC - Convert lower case letter in 'AL' to upper case.
;
CONVUC:	CMP	AL,'a'		;Is char at least a 'a'?
	RC			;No, not lower case
	CMP	AL,'z'+1	;Is char greater than 'z'?
	RNC			;Yes, not lower case
	AND	AL,5FH		;Else convert lower to upper case
	RET
;
; REVCAS - Reverse upper/lower case for letters.
;
REVCAS:	CALL	LETCHK		;Is the char a letter?
	JNZ	#1		;No, don't change it
	XOR	AL,020H		;Reverse upper and lower case
#1:	MOV	CL,AL		;Also return char in C
	RET