1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
org 100h
[map all]
section .bss ; follows=.data
buffer resb 123h
section .data
msg db "this is a message", 0
section .text
mov ax, msg
call showax
mov ax, buffer
call showax
ret
;-----------------
showax:
push cx
push dx
mov cx, 4 ; four digits to show
.top
rol ax, 4 ; rotate one digit into position
mov dl, al ; make a copy to process
and dl, 0Fh ; mask off a single (hex) digit
cmp dl, 9 ; is it in the "A" to "F" range?
jbe .dec_dig ; no, skip it
add dl, 7 ; adjust
.dec_dig:
add dl, 30h ; convert to character
push ax
mov ah, 2
int 21h
pop ax
loop .top
pop dx
pop cx
ret
;--------------------------
|
