l4-65.asm

汇编经典例程,是学习微机原理的好帮手,包括循环 分支等结构

DATA  SEGMENT
BUF  DB  7
     DB  01H,38H,47H,90H,33H,09H,76H     
NUM  DB  3 DUP (?)
DATA  ENDS
CODE  SEGMENT
  ASSUME  CS:CODE, DS:DATA
START:	MOV  AX, DATA
        MOV  DS,AX
        MOV  CH,BUF
        MOV  BX,1
        MOV  DX, 0
LP:     MOV AH, BUF[BX]
        CMP AH,30H
        JL NEXT
        CMP  AH,39H
        JG  ABC
        INC DH
        JMP  NEXT
ABC:    CMP AH,41H
        JL NEXT
        CMP AH,5AH
        JG NEXT
        INC DL
NEXT:	INC  BX
     	DEC CH
     	JNZ LP
     	MOV NUM,DH
     	MOV NUM+1,DL
     	MOV AH,BUF
     	SUB AH,DH
     	SUB AH,DL 
     	MOV NUM+2,AH
	MOV AH,4CH
	INT 21H
CODE ENDS
END START