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 ]
