利用计算机并口可以制作家庭安防系统 目前的废旧计算机其实用途很多，不要浪费啊-use computer printer port input output make home check and fire control system

基于51单片机的简单打字机源程序，完全自主开发，首创51单片机打字机。-Based on 51 single-chip the simple typewriter source of, completely independent development, the first 51 microcontroller typewriter.

PDF stands for Portable Document Format and it was created by Adobe to ease document exchange. doPDF is a free PDF creator that does what the name suggests, creates PDF files. Once installed it will allow you to convert any type of printable document

epson document installation. steps specified in zip file