?? code2.txt
字號:
8255交通燈 試驗《黃海萍版》微機實驗
2007年08月02日 星期四 17:46
DATA SEGMENT
BUF DB 81H,81H,81H,81H
DB 41H,01H,41H,01H,41H,01H,41H,01H,41H
DB 24H,24H,24H,24H
DB 22H,20H,22H,20H,22H,20H,22H,20H,22H
DB 00H
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:
MOV AX,DATA
MOV DS,AX
MOV AL,80H ;;;;;;;;;;;當時片選接到288H~28FH的接口上
MOV DX,0C40BH
OUT DX,AL
MOV DX,0C40AH
RE:
MOV BX,0
ON:
MOV AL,BUF[BX]
CMP AL,00H
JZ RE
INC BX
OUT DX,AL
MOV CX,0FFFFH
TEST AL,42H
JZ DE1
MOV CX,0FFFH
DE1:
MOV DI,02FFFH
DE0:
DEC DI
JNE DE0
MOV AH,1
INT 16H
JNE EXIT
LOOP DE1
JMP ON
EXIT:
MOV AH,4CH
INT 21H
CODE ENDS
END START
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