epm240引脚分配手册

DATA SEGMENT TABDB 3FH,06H,5BH,4FH,66H,6DH,7DH;0~6的段码（字形码） DATA ENDS CODESEGMENT ASSUMECS:CODEDS:DATA START: MOVAL,98H OUT06H,AL XOR AL,AL OUT02H,AL OUT 04H,AL;初始化8255 LOPM:IN AL,04H ;检测开始键 TEST AL,80H