7、EQU8000HTIMER1EQU8001HTIMER2EQU8002HMODE03EQUBMODE12EQUBMODE22EQUBCS8259EQU208H C8255EQU203H;8255状态/命令口地址P8255AEQU200H;8255PA口地址P8255BEQU201H;8255PC口地址P8255CEQU202H;8255PC口地址 DATASEGMENTARYDB8DUP(?)DATAENDS STACKSEGMENTSTACKSTADW50DUP(?)TOPEQULENGTHSTA STA