汇编学习笔记27

例1：

DATA SEGMENT
ORG 1000H
BLOCK DB 48H, 8DH
RESULT DB ?
DATA ENDS

STACK SEGMENT PARA STACK 'STACK'
DB 64 DUP(?)
STACK ENDS

CODE SEGMENT
  ASSUME CS: CODE, SS: STACK, DS: DATA

START PROC
BEGIN: MOV AX, DAT
AMOV DS, AX
MOV SP, 4000H
LEA BX, BLOCK
MOV AL, [BLOCK]
SUB AL, [BX + 1]
PUSH AX
PUSHF
CALL SUB1
POPF
POP AX
MOV [BX + 2], AL
HLT
START ENDP

SUB1 PROC
ADD AL, AL
RET
SUB1 ENDP

CODE END
SEND BEGIN

XOR AL, AL
MOV AX, CS
MOV SS, AX
MOV SP, 2F00H
MOV DX, 2012H
PUSH DX
CALL 2700H
ADD CX, DX
POP CX
RET