利用ＰＣ并行口打造电脑音源切换器 这个制作对于普通的DIYer来说是有一定难度的，但是对于掌握电脑硬件和电子制作的DIYer来说还是很容易完成的．电路原理十分简单，利用Ｃ编程-PC parallel port using a computer to create sources of noise switching device for the production of ordinary DIYer is a certain difficult, but mastering compute

Supports CPiA based parallel port Video Camera s.