汇编输出0-255ascii码（VGA下）

源代码：

data segment
a db 00h
x db "000"
y db "000 ",0Dh, 0Ah, "$"
data ends
code segment
assume cs:code, ds:data
main:
mov ax, data
mov ds, ax
mov ax, 0B800h
mov es, ax
xor di, di
mov ax , 0003h
int 10h
mov al, 0h
mov [a], al
cld
again:
call change
call change1
mov ah, 04h
mov al, x[0]
stosw
mov ah, 02h
mov al, x[1]
stosw
mov al, x[2]
stosw
mov ah, 07h
mov al, y[0]
stosw
mov al, y[1]
stosw
mov al, y[2]
stosw
mov al, y[3]
stosw
call next
mov cl, [a]
inc cl
mov [a], cl
cmp cl, 0h
jne again
jmp over
over:
mov dh, 24
mov dl, 79
mov ah, 2
int 10h
mov ah, 0
int 16h
mov ah, 4Ch
int 21h
next:
cmp di, 3840
ja next1
add di, 146
jmp done
next1:
sub di, 3840
change:
mov al, [a]
mov x[0], al
mov cl, 4
shr al, cl
mov ah, al
call hex
mov x[1], al
mov al, [a]
and al, 0Fh
call hex
mov x[2], al
mov al, [a]
ret
hex:
cmp al, 10
jb add0
sub al, 10
add al, 'A'
jmp done
add0:
add al, '0'
done:
ret
change1:
mov al, [a]
mov ah, 0
mov bl, 100
div bl
add al, 30h
mov y[0], al
mov al, ah
mov ah, 0
mov bl, 10
div bl
add al, 30h
mov y[1], al
add ah, 30h
mov y[2], ah
ret
code ends
end main

个人汇编语言基础学习总结：

学习汇编就像学习用新的材料创造建筑，汇编不像C，C++一类语言已经建立完整的模型函数库，汇编语言就像沙子，给你无尽的内存地址，就看你在这些地址上放些什么以及如何摆放。其实任何一个程序员都应该对汇编的基础语言学习了解，否则他永远不知道原来计算机的内存是可以这么“玩”的