使用汇编语言编写一条简单的贪吃蛇的实现

本文中的汇编语言是基于x86芯片，下面给出代码：

;TITLE  GAME4TH
PAGE 60,132
STSEG SEGMENT
    DB 64 DUP (0)
STSEG ENDS
;-----------------------------------
DTSEG SEGMENT
DATAH DB  10H,10H,10H,10H,10H,10H,10H,10H,10H
DATAL DB  20H,21H,22H,23H,24H,25H,26H,27H,28H
DTSEG ENDS
CR   EQU 0DH
LF   EQU 0AH
;------------------------------------
CDSEG SEGMENT
MAIN PROC FAR
   ASSUME CS:CDSEG,DS:DTSEG,SS:STSEG
   MOV AX,DTSEG
   MOV DS,AX
   MOV AX,0600H
   MOV BH,00011110B
   MOV CX,0
   MOV DH,18H
   MOV DL,04FH
   INT 10H

FISH: MOV AX,0600H
   MOV BH,00011110B
   MOV CX,0
   MOV DH,18H
   MOV DL,04FH
   INT 10H
   MOV AH,02
   MOV BH,00
   MOV SI,OFFSET DATAH
   MOV DI,OFFSET DATAL
   MOV DH,[SI]
   MOV DL,[DI]
   INT 10H
   MOV AX,0201H
   MOV DL,'+'
   INT 21H
   MOV AH,02
   MOV BH,00
   MOV DH,[SI]+1
   MOV DL,[DI]+1
   INT 10H
   MOV AX,0201H
   MOV DL,'#'
   INT 21H
   MOV AH,02
   MOV BH,00
   MOV DH,[SI]+2
   MOV DL,[DI]+2
   INT 10H
   MOV AX,0201H
   MOV DL,'#'
   INT 21H
   MOV AH,02
   MOV BH,00
   MOV DH,[SI]+3
   MOV DL,[DI]+3
   INT 10H
   MOV AX,0201H
   MOV DL,'#'
   INT 21H
   MOV AH,02
   MOV BH,00
   MOV DH,[SI]+4
   MOV DL,[DI]+4
   INT 10H
   MOV AX,0201H
   MOV DL,'#'
   INT 21H
   MOV AH,02
   MOV BH,00
   MOV DH,[SI]+5
   MOV DL,[DI]+5
   INT 10H
   MOV AX,0201H
   MOV DL,'#'
   INT 21H
   MOV AH,02
   MOV BH,00
   MOV DH,[SI]+6
   MOV DL,[DI]+6
   INT 10H
   MOV AX,0201H
   MOV DL,'#'
   INT 21H
   MOV AH,02
   MOV BH,00
   MOV DH,[SI]+7
   MOV DL,[DI]+7
   INT 10H
   MOV AX,0201H
   MOV DL,'#'
   INT 21H
   MOV AH,02
   MOV BH,00
   MOV DH,[SI]+8
   MOV DL,[DI]+8
   INT 10H
   MOV AX,0201H
   MOV DL,'>'
   INT 21H           

LOOP1:MOV AH,0   ;循环输入
   MOV AL,0
   INT 16H
   CMP AH,72
   JE  UP
   CMP AH,80
   JE  DOWN
   CMP AH,77
   JE  RIGHT
   CMP AH,75
   JE  LEFT 

UP:  MOV SI,OFFSET DATAH
   MOV DI,OFFSET DATAL
   MOV DH,[SI]+8
   MOV DL,[DI]+8
   MOV CH,DH
   MOV CL,DL
   DEC DH
   MOV [SI]+8,DH
   MOV [DI]+8,DL
   JMP BACK      

DOWN: MOV SI,OFFSET DATAH
   MOV DI,OFFSET DATAL
   MOV DH,[SI]+8
   MOV DL,[DI]+8
   MOV CH,DH
   MOV CL,DL
   INC DH
   MOV [SI]+8,DH
   MOV [DI]+8,DL
   JMP BACK     

LEFT: MOV SI,OFFSET DATAH
   MOV DI,OFFSET DATAL
   MOV DH,[SI]+8
   MOV DL,[DI]+8
   MOV CH,DH
   MOV CL,DL
   DEC DL
   MOV [SI]+8,DH
   MOV [DI]+8,DL
   JMP BACK     

RIGHT:MOV SI,OFFSET DATAH
   MOV DI,OFFSET DATAL
   MOV DH,[SI]+8
   MOV DL,[DI]+8
   MOV CH,DH
   MOV CL,DL
   INC DL
   MOV [SI]+8,DH
   MOV [DI]+8,DL
   JMP BACK

BACK: MOV DH,[SI]+7
   MOV DL,[DI]+7
   MOV [SI]+7,CH
   MOV [DI]+7,CL
   MOV CH,DH
   MOV CL,DL
   MOV DH,[SI]+6
   MOV DL,[DI]+6
   MOV [SI]+6,CH
   MOV [DI]+6,CL
   MOV CH,DH
   MOV CL,DL
   MOV DH,[SI]+5
   MOV DL,[DI]+5
   MOV [SI]+5,CH
   MOV [DI]+5,CL
   MOV CH,DH
   MOV CL,DL
   MOV DH,[SI]+4
   MOV DL,[DI]+4
   MOV [SI]+4,CH
   MOV [DI]+4,CL
   MOV CH,DH
   MOV CL,DL
   MOV DH,[SI]+3
   MOV DL,[DI]+3
   MOV [SI]+3,CH
   MOV [DI]+3,CL
   MOV CH,DH
   MOV CL,DL
   MOV DH,[SI]+2
   MOV DL,[DI]+2
   MOV [SI]+2,CH
   MOV [DI]+2,CL
   MOV CH,DH
   MOV CL,DL
   MOV DH,[SI]+1
   MOV DL,[DI]+1
   MOV [SI]+1,CH
   MOV [DI]+1,CL
   MOV CH,DH
   MOV CL,DL
   MOV DH,[SI]
   MOV DL,[DI]
   MOV [SI],CH
   MOV [DI],CL
   MOV CH,DH
   MOV CL,DL
   JMP FISH   

MAIN ENDP
CDSEG ENDS
   END MAIN

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