汇编语言（2字节相减）

DATAS SEGMENT
BUF0 DB 1
BUF1 DB 2
DATAS ENDS

STACKS SEGMENT
DB 100 DUP(?)
STACKS ENDS

CODES SEGMENT
ASSUME CS:CODES,DS:DATAS,SS:STACKS

START:
MOV AX,DATAS
MOV DS,AX
MOV AL,BUF0
SUB AL,BUF1
CODES ENDS

END START