汇编语言的练习与答案..谢谢答:begin:mov ah,1 int 21h cmp al,'A'jb lab4 cmp al,'Z'ja lab4 mov dl,'U'jmp lab3 lab4: cmp al,'a'jb lab1 cmp al,'z'ja lab1 mov dl,'L'jmp lab3 lab1: mov dl,'*'lab3: mov ah,2 int 21h mov ah,4ch int 21h code ends end begin 2.存储器的一个数据区...
方波发生器设计 汇编语言编程答:START: ;init 8255A MOV DX,0FF2BH MOV AL,10000001B;方式命令字,PC0~PC3输入 OUT DX,AL ;control pcBEGIN: MOV DX,0FF2AH IN AL,DX ;读PC口值 MOV BL,AL ;存入BL CMP BL,02H ;"跳跃表",选择波形 JB FWAVE ;方波00~01,锯齿波02~03,三角波,04~05 CMP BL,04H JB JWAVE CMP BL,06H JB ...