1.IO驱动74LS164 2.IO驱动74LS165 3.串口驱动74LS164 4.串口驱动74LS165 5.8155驱动程序 6.8255驱动程序 7.用8243扩展IO接口.-1.IO driver 74LS164 2.IO driver 74LS165 3. Serial driver 74LS164 4. Serial driver 74LS165 5.8155 driver 6.8255 driver 7. IO interfaces with the 8243 ex