DRAWCH        MACRO  ROWVAL, COLVAL, PIXVAL, CHARVAL
        MOV     AH,02           ; set cursor function
        MOV     BH,0            ; page 0
        MOV     DH,ROWVAL
        MOV     DL,COLVAL
        INT     10H

        MOV     AH,9            ; write char function
        MOV     AL,CHARVAL      ; set to character value in ASCII
        MOV     BL,PIXVAL       ; set color to light blue
        MOV     CX,1            ; do it once
        INT     10H
        ENDM