I must make a circuit,it includes :microprocessor 89C51 to control some matrix leds to flow a string into.And it uses 8255A-5 to I/O to matrix leds,SRAM6264,EPROM2764,Latch:SN74LS573,decoder:SN74LS138,sweep column:SN74LS164..I can design this circuit but I can't write a good program use ASM for it.Whom can help me?Thanks