.model small
.386
.stack
.data
data1 dw 1234h,0ef78h
data2 db 16dup(?),0dh,0ah,'$'
data3 db 'my data:',0dh,0ah,'$'
tab db '0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,'
.code
.startup
mov si,offset date1
asd: mov cx,2
mov AL,[SI]
INC SI
call abc
loop asd
.exit
abc proc
push ax
mov cl,4
shr al,cl
and al,0fh
mov bx,offset tab
xlat
mov al,dl
mov ah,2
int 21h
pop ax
and al,ofh
xlat
mov bl,al
mov ah,2
int 21h
abc endp
.exit
end

￣

mov bl,al ；该是dl吧
mov ah,2
int 21h

总之，看不大懂这种简化段定义的汇编。还是完整段定义的汇编看着工整。