MCS51单片机的入门级开发板原理图和PCB图纸，可以很直接拿来做板的,MCS51 MCU development board, entry-level schematic and PCB drawings, can be directly used as plates

本人基于protel99设计的mcs51单片机学习板，附有原理图和印制板图。-I SCM-based learning protel99 design mcs51 board, with schematic and PCB map.

This test code to test the mini-dep io controller pcb using MCS51 micro controller-This is test code to test the mini-dep io controller pcb using MCS51 micro controller