assume cs:code
stack segment
db 128 dup (0)
stack ends
code segment
start:mov ax,stack
mov ss,ax
mov sp,128
push cs
pop ds
mov ax,0
mov es,ax
mov si,offset int9
mov di,204h
mov cx,offset int9_end - offset int9
cld
rep movsb
push es:[9*4]
push es:[9*4+2]
pop es:[202h]
pop es:[200h]
cli
mov word ptr es:[9*4],204h
mov word ptr es:[9*4+2],0
sti
mov ax,4c00h
int 21h
int9:jmp short int9_start
db "QWERTYUIOP0000ASDFGHJKL00000ZXCVBNM"
int9_start: push ax
push bx
push cx
push si
push es
in al,60h
pushf
call dword ptr cs:[200h]
mov ah,al
mov cl,7
shr ah,cl;取扫描码 第7位
cmp ah,1;判断是否为断码
jne int9_ret
sub al,80h
sub ah,ah
sub al,16
mov si,ax
mov bx,0b800h
mov es,bx
mov cx,2000
sub bx,bx
mov ah,2
s:
mov al,cs:[206h+si]
mov es:[bx],ax
add bx,2
loop s
jmp short int9_ret
int9_ret: pop es
pop si
pop cx
pop bx
pop ax
iret
int9_end:nop
code ends
end start |
