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| assume cs:code
stack segment
db 128 dup(0)
stack ends
code segment
start: mov ax, stack
mov ss, ax
mov sp, 128
mov ax, 0b800h
mov es, ax
mov ah, 'a'
s:
mov es:[160*12+40*2], ah
call delay
inc ah
cmp ah, 'z'
jna s
mov ax, 4c00H
int 21H
delay:
push ax
push dx
mov dx, 10H
mov ax, 0
s1:
sub ax, 1
sbb dx, 0
cmp ax, 0
jne s1
cmp dx, 0
jne s1
pop dx
pop ax
ret
code ends
end start
|
