rjexp8.asm

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DATA  SEGMENT
MESS1 DB '按下数字键,响铃对应次数,回车或空格键则返回',0DH,0AH,'$'
DATA  ENDS
STACK SEGMENT
STA  DB  50 DUP(?)
TOP  EQU LENGTH STA
STACK  ENDS
CODE  SEGMENT
ASSUME  CS:CODE,DS:DATA,ES:DATA,SS:STACK
START: MOV  AX,DATA
       MOV  DS,AX
       MOV  ES,AX
       MOV  AX,STACK
       MOV  SS,AX
       MOV  SP,TOP       ;段寄存器和堆栈初始化
       MOV  AH,09H
       LEA  DX,MESS1
       INT  21H
KKK:   MOV  AH,01H
       INT  21H          ;读取键盘字符
       CMP  AL,0DH
       JE   PPP          ;是回车则转结束
       CMP  AL,20H       ;是空格则转结束
       JE   PPP
       CMP  AL,39H
       JA   KKK;          ;非字符1-9转KKK
       SUB  AL,2FH
       XOR  AH,AH
       MOV  BP,AX         ;对应次数送BP
GGG:   DEC  BP
       JZ   KKK
       MOV  AH,02H
       MOV  DL,07H
       INT  21H           ;响铃1次
       MOV  CX,0FFFFH
UUU:   LOOP UUU           ;延时一段时间
       JMP  GGG
       DEC  BP            ;次数减1
       JNZ  GGG           ;不为0则转GGG
PPP:   MOV  AX,4C00H
       INT  21H           ;返回DOS
CODE   ENDS
		END    START