8086-Lab-Programs/ASCII.ASM at master · uvce-lab/8086-Lab-Programs · GitHub

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WRITELINE MACRO MSG
    MOV AH, 09H
    MOV DX, OFFSET MSG
    INT 21H
ENDM
.MODEL SMALL
.DATA
    ENT DB 'Press a key: $'
    REDISP DB 4	DUP(0)
.CODE
    MOV AX, @DATA
    MOV DS, AX
    WRITELINE ENT

    MOV AH, 01H
    INT 21H
    MOV AH, 00H

	MOV SI, OFFSET REDISP
    CALL HEX2ASC

	; Clear the Screen
    MOV BH, 0007H
    MOV CX, 0000H
    MOV DX, 184FH
    MOV AX, 0600H
    INT 10H

	; BH, DH, DL --> Page, Row, Column
    MOV AH, 02H
    MOV BH, 0
    MOV DH, 12
    MOV DL, 40
    INT 10H

    WRITELINE REDISP
    MOV AH, 4CH
    INT 21H

    HEX2ASC PROC NEAR
		MOV CX, 0
		MOV BX, 10
		DIVIDE:
			MOV DX, 0
			DIV BX
			ADD DL, '0'
			PUSH DX
			INC CX
			CMP AX, 10
			JGE DIVIDE
		ADD AL, '0'
		MOV [SI], AL

		BUILDUP:
		POP AX
		INC SI
		MOV [SI], AL
		LOOP BUILDUP

		INC SI
		MOV AL, '$'
		MOV [SI], AL

		RET
    HEX2ASC ENDP
    END