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|
assume cs:code,ds:data,ss:stack
stack segment
db 128 dup('?')
stack ends
data segment
db 8 dup('abcdABCD')
big db 64 dup('?')
small db 64 dup('?')
data ends
code segment
sta:
mov ax,data
mov ds,ax
mov ax,stack
mov ss,ax
mov ax,0b800h
mov es,ax
call toBig
call toSmall
xor di,di
push di
xor si,si
call dis_play
lea si,big
mov di,160
call dis_play
lea si,small
mov di,320
call dis_play
mov ah,4ch
int 21h
toBig:
mov cx,64
lea di,big
xor si,si
again_1:
mov al,[si]
and al,0dfh
mov [di],al
inc si
inc di
loop again_1
ret
toSmall:
mov cx,64
lea di,small
xor si,si
again_3:
mov al,[si]
or al,20h
mov [di],al
inc si
inc di
loop again_3
ret
dis_play:
mov cx,64
again:
mov al,[si]
mov es:[di],al
add di,2
inc si
loop again
ret
code ends
end sta
|
