📄 4-1.asm
字号:
data segment
PA equ 288h
PB equ 289h
PC equ 28ah
CTL55 equ 28bh
TABLE db 3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fh,77h,7fh,39h,3fh,79h,71h
data ends
code segment
assume ds:data,cs:code
start:
mov ax,data
mov ds,ax
mov cx,10h
mov dx,CTL55
mov al,10011000b
out dx,al
L0:
mov dx,PC
in al,dx
test al,80h
jnz L0
mov dx,PA
in al,dx
and al,0fh
lea bx,TABLE
xlat
mov dx,PB
out dx,al
L1:
mov dx,PC
in al,dx
test al,80h
jz L1
loop L0
mov ah,4ch
int 21h
code ends
end start
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