电子琴汇编代码

;*******************************;
;*         电子琴实验          *;
;*******************************;

data segment
io8255a        equ 288h
io8255b        equ 28bh
io8253a        equ 280h
io8253b        equ 283h
table dw 524,588,660,698,784,880,988,1048;高音的
;table dw 262,294,330,347,392,440,494,524;低音的
msg db 'Press 1,2,3,4,5,6,7,8,ESC:',0dh,0ah,'$'
data ends

code segment
assume cs:code,ds:data
start:
    mov ax,data
    mov ds,ax

    mov dx,offset msg
    mov ah,9
    int 21h              ;显示提示信息
sing:    
    mov ah,7
    int 21h              ;从键盘接收字符,不回显
    cmp al,1bh
    je finish            ;若为ESC键,则转finish
    cmp al,'1'
    jl  sing