源码如下：

;mcd.asm
.286
code segment
assume cs:code,ds:code
org 100h
start:
jmp init_cd ;到初始化
cd_command db 32 dup(0) ;CD-AUDIO 控制区
cd_state db 32 dup(0) ;CD-AUDIO 状态区
max_track db 0,0 ;CD最大道
min_track db 0,0 ;CD最小道
lead_track dw 0
track dw ?
track_buff db 40*4 dup(?) ;CD音道数据区(预定为40个)
int33_off dw ? ;原鼠标中断向量
int33_seg dw ?
user_dx dw ? ;用户鼠标事件向量
user_es dw ?
mark db 0
ctrl db 0 ;CD控制方式
next equ 1 ;前进
back equ 0 ;到退
stop equ 2 ;停止
cd_rom_driver dw ? ;CD驱动器号
red_max_h dw ?
red_max_l dw ?
cd_int macro ;控制CD-AUDIO的宏
mov ax,1510h
mov cx,cd_rom_driver
int 2fh
endm

my: ;本程序的鼠标事件 MY
pushf
cmp bx,7 ;是否三键同时按下
jnz ttt
mov cs:ctrl,stop ;停止
jmp ll
ttt:
cmp bx,3 ;是否两键同时按下
jnz q
cmp dx,1 ;鼠标在最上
jnb other
mov cs:ctrl,stop ;停止
jmp ll
other:
cmp cx,599 ;鼠标在最右
jb qqq
mov cs:ctrl,next ;前进
jmp ll

qqq:
cmp cx,1
jae q
mov cs:ctrl,back ;鼠标在最左,倒退
ll:
pusha
push ds
push es

push cs
pop ds
push cs
pop es

call mediachg ;是否更换CD
cmp al,0ffh
jnz che
call init ;更换CD后的初始化
che:
call check ;CD状态检查
cmp cs:ctrl,next
jz ff
cmp cs:ctrl,back
jz rew

ff: ;前进
cmp al,max_track ;是超过最大音轨
jb goo
mov al,0 ;如超过,由第一音轨开始
goo:
inc al ;音轨加一
jmp okk

rew: ;倒退
cmp al,1 ;是否小于最小音轨
ja dy
mov al,max_track ;如小于,由最大音轨开始
jmp okk
dy:
dec al ;音轨减一

okk:
mov byte ptr cs:track,al
call pause ;暂停
cmp cs:ctrl,stop
jz exit
call play ;播放
exit:
pop es
pop ds
popa

q:
cmp cs:mark,1 ;用户事件是否有效
jnz qq
popf
jmp dword ptr cs:user_dx;转向(模拟)用户鼠标事件
qq:
popf
retf ;MY 鼠标事件返回

new_33 proc near ;新的鼠标中断
cmp ax,8888h
jnz l005
mov ax,'zd' ;是否已驻留
iret ;中断返回

l005:
cmp ax,000ch
jz l_000 ;设置鼠标事件,转l_000
cmp ax,0
jz mre
cmp ax,0021h
jnz l001 ;鼠标初始化

mre:
mov cs:mark,0
pushf
call dword ptr cs:int33_off ;调用原鼠标中断初始化
pusha
push es
mov ax,cs
mov es,ax
mov ax,000ch ;0Ch号功能,设置鼠标事件
mov cx,00001010b
mov dx,offset my ;指向 MY
pushf
call dword ptr cs:int33_off;设置本程序鼠标事件 MY
pop es
popa
iret ;中断返回
l001:
jmp dword ptr cs:int33_off ;调用其它鼠标功能

l_000: ;
mov cs:user_dx,dx
mov cs:user_es,es ;保存用户鼠标事件向量
push es
push dx
push cs
pop es
mov dx,offset my ;指向 MY
mov cs:mark,1 ;设置标志,表示是用户事件
pushf
call dword ptr cs:int33_off;设置用户鼠标事件,
;实质是指向本程序事件MY
pop dx
pop es
iret ;中断返回
new_33 endp

init proc near ;初始化,读取CD-AUDIO信息
mov track,1
mov di,offset track_buff
mov byte ptr cd_command[0],1ah
mov byte ptr cd_command[1],0
mov byte ptr cd_command[2],03
mov byte ptr cd_command[13],00
mov word ptr cd_command[20],0000h
mov word ptr cd_command[24],0000h
mov word ptr cd_command[22],0000h
mov word ptr cd_command[16],es
mov word ptr cd_command[14],offset cd_state
mov word ptr cd_command[18],0007h
mov byte ptr cd_state[0],0ah
mov ax,ds
mov es,ax
mov bx,offset cd_command
cd_int ;调用CD服务程序
mov al,byte ptr cd_state[1]
mov min_track,al ;最小音轨号
mov al,byte ptr cd_state[2]
mov max_track,al ;最大音轨号
mov al,byte ptr cd_state[5]
xor ah,ah
xor dx,dx
xor cx,cx
mov bx,4500 ;每分钟扇区数
call szd
push dx
push ax
mov al,byte ptr cd_state[4]
xor ah,ah
xor dx,dx
xor cx,cx
mov bx,75 ;每秒钟扇区数
call szd
pop bx
pop cx
add bx,ax
adc cx,dx
mov al,byte ptr cd_state[3]
xor ah,ah
xor dx,dx
add bx,ax
adc cx,dx
add bx,0ff6ah
adc cx,-01
mov red_max_h,cx
mov red_max_l,bx ;保存最大扇区数
test word ptr cd_command[3],8000h
je bza
mov ax,0ffffh ;出错AX=FFFF
jmp quit_2
bza:
mov ax,ds
xor dx,dx
mov word ptr cd_command[16],es
mov word ptr cd_command[14],offset cd_state
mov word ptr cd_command[18],0007h
mov byte ptr cd_state[0],0bh
mov si,word ptr min_track
jmp bzb
bzc:
mov ax,si
mov byte ptr cd_state[1],al ;al为音轨号
mov ax,ds
mov es,ax
mov ax,offset cd_command
mov bx,ax
cd_int
mov al,byte ptr cd_state[4]
xor ah,ah
xor dx,dx
xor cx,cx
mov bx,4500
call szd
push dx
push ax
mov al,byte ptr cd_state[3]
xor ah,ah
xor dx,dx
xor cx,cx
mov bx,75
call szd
pop bx
pop cx
add bx,ax
adc cx,dx
mov al,byte ptr cd_state[2]
xor ah,ah
xor dx,dx
add bx,ax
adc cx,dx
add bx,0ff6ah
adc cx,-01
mov word ptr [di+2],cx
mov word ptr [di+0],bx
add di,4
test word ptr cd_command[3],8000h
je bzd
mov ax,0ffffh ;出错
jmp quit_2
bzd:
inc si ;音轨号加1
bzb:
cmp si,word ptr max_track ;是否超过最大音轨号
ja quit_2
jmp bzc
quit_2:ret
init endp

szd proc near ;乘法计算
push si
xchg ax,si
xchg ax,dx
test ax,ax
je bzz
mul bx
bzz:
xchg ax,cx
test ax,ax
je bzx
mul si
add cx,ax
bzx:
xchg ax,si
mul bx
add dx,cx
pop si
ret
szd endp

play proc near ;播放CD
mov byte ptr cd_command[0],16h
mov byte ptr cd_command[1],0
mov byte ptr cd_command[2],84h
mov byte ptr cd_command[4],0
mov byte ptr cd_command[13],00
mov di,offset track_buff
mov bx,track
dec bx
shl bx,1
shl bx,1
mov dx,red_max_h
mov ax,red_max_l
sbb dx,[di+bx+2]
sub ax,[di+bx+0]
mov word ptr cd_command[20],dx ;要播放的扇区数
mov word ptr cd_command[18],ax
mov dx,word ptr [di+bx+2]
mov ax,word ptr [di+bx+0]
mov word ptr cd_command[16],dx
mov word ptr cd_command[14],ax ;起始扇区数
mov bx,offset cd_command
cd_int
test word ptr cd_command[3],8000h
jne err_p ;出错
xor ax,ax
jmp quit_1
err_p:mov ax,0ffffh ;出错
quit_1:ret
play endp

pause proc near ;暂停
mov byte ptr cd_command[0],16h
mov al,7
mov byte ptr cd_command[1],al
mov byte ptr cd_command[2],85h
mov bx,offset cd_command
cd_int
ret
pause endp

check proc near ;检查CD状态
mov byte ptr cd_command[0],1ah
mov byte ptr cd_command[1],0
mov byte ptr cd_command[2],3h
mov byte ptr cd_command[13],0
mov word ptr cd_command[20],0
mov word ptr cd_command[24],0
mov word ptr cd_command[18],0bh
mov cd_command[16],ds
mov word ptr cd_command[14],offset cd_state
mov byte ptr cd_state[0],0ch
mov bx,offset cd_command
cd_int
xor ax,ax
mov al,cd_state[2]
mov bl,al ;BCD到16进制转换
mov cl,4
and bl,11110000b
jz quit
shr bl,cl
and al,00001111b
crep:
add al,10
dec bl
jnz crep
quit:ret ;返回当前音轨号
check endp

mediachg proc near
mov byte ptr cd_command[0],1ah
mov byte ptr cd_command[1],0
mov byte ptr cd_command[2],03
mov word ptr cd_command[14],0000h
mov word ptr cd_command[16],0000h
mov word ptr cd_command[18],0000h
mov word ptr cd_command[16],es
mov word ptr cd_command[14],offset cd_state
mov word ptr cd_command[18],0002h
mov byte ptr cd_state[0],09h
mov ax,ds
mov es,ax
mov bx,offset cd_command
cd_int ;调用CD服务程序
mov al,cd_state[1]
ret ;返回al=0ffH,则更换过CD片
mediachg endp

init_cd:
mov ax,8888h
int 33h
cmp ax,'zd'
jnz l004 ;驻留检查
mov dx,offset mess
mov ah,9
int 21h
jmp _quit ;已驻留,则退出
l004:
mov ax,0 ;复位鼠标
int 33h
cmp ax,0ffffh ;鼠标驱动程序检查
jz ok
mov dx,offset mess2
mov ah,9
int 21h
mov dx,offset mess1
mov ah,9
int 21h
_quit:
mov ah,4ch
int 21h
ok:
mov ax,1500h
mov bx,0
xor cx,cx
int 2fh ;取CD-ROM驱动器号
cmp cx,2
jg next1
mov dx,offset mess2
mov ah,9
int 21h
mov dx,offset err ;CD-ROM出错
mov ah,9
int 21h
jmp _quit ;退出

next1:
mov cd_rom_driver,cx
call init ;初始化CD-ROM
cmp ax,0ffffh
jnz checkcd
mov dx,offset mess2
mov ah,9
int 21h
mov dx,offset err ;CD-ROM出错
mov ah,9
int 21h
jmp _quit

checkcd:

mov ah,9
mov dx,offset mess2 ;显示信息
int 21h

mov ah,9
mov dx,offset usage
int 21h

call check ;CD-AUDIO状态检查
mov byte ptr track,al
call pause ;暂停
call play ;播放

mov ax,000ch ;鼠标事件设置
mov cx,00001010b
mov dx,ds
mov es,dx
mov dx,offset my ;指向 my
int 33h

mov ax,3533h
int 21h ;取鼠标中断向量

mov cs:int33_off,bx
mov cs:int33_seg,es ;保存原鼠标中断向量
mov ax,2533h
mov dx,offset new_33
push cs
pop ds
int 21h ;设置新的鼠标中断,指向 new_33

mov dx,offset init_cd ;驻留内存
int 27h
mess1 db 'MOUSE NOT INSTALLED!',0dh,0ah,'$'
mess2 db 'MOUSE CD-PLAYER Ver 1.01 Copyright (c) ZDsoft.',0dh,0ah
db 'Write by Zou Dan,1995,8',0dh,0ah
db 'TELE (023)65311989-6023,POST CODE:630045',0dh,0ah
db 'ADDRESS:No.80-7-2,East Village,Architectural University,ChongQing',0ah,0dh
db 'OR No.51 Postbox,Math Department,East Part of ShiChuan University',0dh,0ah
db 'Post CODE:610064,ShiChuan',0dh,0ah,'$'
mess db 'MOUSE CD-PLAYER ALREADY INSTALLED',0dh,0ah,'$'
usage db 'USAGE:',0dh,0ah
db ' STOP: Press LEFT,MIDDLE,RIGHT botton at the same time.',0dh,0ah
db ' (For Three-Botton Mouse).',0dh,0ah
db ' OR Move the mouse to TOP and press LEFT and RIGHT botton at the same time.',0dh,0ah
db ' (This is special designed for Two-Botton Mouse.)',0dh,0ah
db 'PLAY Pre. TRACK: Move the mouse to the LEFT side and',0dh,0ah
db ' press LEFT and RIGHT botton at the same time.',0dh,0ah
db 'PLAY Next TRACK: Move the mouse to the RIGHT side and',0dh,0ah
db ' press LEFT and RIGHT botton at the same time.',0dh,0ah,'$'
err db 'CD-ROM ERROR!',0dh,0ah,'$'

code ends
end start