汇编代码看不懂，求解

微机原理与接口代码看不懂，求大神给个备注，代码在这里面，http://pan.baidu.com/share/link?shareid=509851277&uk=4012905143



代码如下:
CODE SEGMENT ;H8279.ASM

ASSUME CS:CODE

D8279 EQU 0FF80H

C8279 EQU 0FF81H

ORG 2A90H

JMP START

KH DB ? ;KEY HAO

ZW DB ?

ZX DB ?

START: MOV DX,C8279 ;8001H WR-->MODE

MOV AL,00H ;8BIT L-IN 2KEY

OUT DX,AL

MOV AL,32H ;FENG PIN

OUT DX,AL

MOV AL,0DFH ;CLR BUF

OUT DX,AL

WAIT:IN AL,DX ;clr buf end ?

TEST AL,80H

JNZ WAIT

MOV AL,85H ;WR DISRAM ADR Y5(PA5);100 0 0101-->com no-inc y5

OUT DX,AL

MOV DX,D8279 ;ff80H WR DATA 'P'

MOV AL,0C8H

OUT DX,AL

START0: MOV ZW,85H ;BEST H BIT

NEXT: MOV KH,00H ;KEY HAO 0..FH,10..13H

MOV DX,C8279 ;8001H RD STATUS KEY ?

NOKEY: IN AL,DX

AND AL,07H

CMP AL,00H

JZ NOKEY

MOV DX,D8279 ;ff80H rd key zhi

IN AL,DX

MOV AH,AL ;SAVE KEY ZHI

MOV BX,OFFSET TABK

CMPK: MOV AL,KH

XLAT

CMP AH,AL

JZ KEY

INC KH

CMP KH,14H

JNC KEY0

JMP CMPK

KEY: CMP KH,10H

JNC FUN

CALL DIS

DEC ZW

KEY0: CMP ZW,7FH

JNZ NEXT

JMP START0

FUN:CMP KH,13H

JNZ KEY0

MOV ZW,85H

MOV KH,08H

CALL DIS

MOV ZW,84H

MOV KH,02H

CALL DIS

MOV ZW,83H

MOV KH,07H

CALL DIS

MOV ZW,82H

MOV KH,09H

CALL DIS

MOV ZW,81H

MOV KH,11H

CALL DIS

MOV ZW,80H

MOV KH,11H

CALL DIS

;--------------------

CALL DELY

MOV ZW,85H

MOV KH,09H

CALL DIS

MOV ZW,84H

MOV KH,00H

CALL DIS

MOV ZW,83H

MOV KH,00H

CALL DIS

MOV ZW,82H

MOV KH,0DH

CALL DIS

MOV ZW,81H

MOV KH,10H

CALL DIS

MOV ZW,80H

MOV KH,10H

CALL DIS

JMP $

DIS:MOV DX,C8279 ;WR BIT,BIT 85H,84H,..80H

MOV AL,ZW

OUT DX,AL

MOV AL,KH ;WR CODE

MOV BX,OFFSET TABC

XLAT

MOV DX,D8279 ;ff80H

OUT DX,AL

RET

DELY: MOV BX,00FFH

DELY1: DEC BX

CMP BX,0000

JZ DELY2

MOV CX,04FFH

LOOP $

JMP DELY1

DELY2: RET

TABK:DB 0C9H,0C1H,0D1H,0E1H,0C8H,0D8H,0E8H,0C0H,0D0H

DB 0E0H,0F0H,0F8H,0F1H,0F9H,0E9H,0D9H

DB 0F2H,0FAH,0F3H,0FBH

TABC:DB 0CH,9FH,4AH,0BH,99H,29H,28H,8FH,08H,09H,88H

DB 38H,6CH,1AH,68H,0E8H,0FFH,0FBH

CODE ENDS

END START

[ 本帖最后由 背锅王 于 2015-7-1 13:04 编辑 ]