51单片机32路并口多花样程序，用于沙盘模型或LED灯光招牌-51 single-chip 32-channel parallel port Multi-pattern program for the sand table model or LED illuminated signs

数控切割控制系统,需要DLPORTIO,通过控制8位的并口的电位高低来4路控制数控切割机-NC cutting control system, required DLPORTIO, by controlling the parallel port 8 to the potential level of 4-way control of CNC cutting machine