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1. 详细的介绍了串口的原理,编程,强烈推荐
http://www.beyondlogic.org/serial/serial.htm - 外文
2. Serial Programming Guide for POSIX Operating Systems 强烈推荐
http://www.easysw.com/~mike/serial/serial.html - 外文
3. RS-232
http://www.ctips.com/rs232.html - 外文
4. The AT-PS/2 Keyboard Interface
http://panda.cs.ndsu.nodak.edu/~achapwes/PICmicro/keyboard/atkeyboard.html - 外文
5. PS/2 KEYBOARD & MOUSE PROTOCOLS
Data transmissions to and from the auxiliary device connector consist of an 11-bit data stream sent serially over the 'data' line. The following table shows the function of each bit. The parity bit is either 1 or 0, and the 8 data bits, plus the parity bit, always have an odd number of 1's.
http://www.networktechinc.com/ps2-prots.html - 外文
6. RS232标准与使用指南
http://www.camiresearch.com/Data_Com_Basics/RS232_standard.html - 外文
7. 接口开发文档下载
http://www.eetop.com.cn/index-2.php - 中文
8. 非常详细的介绍了RS-232,图文并茂,推荐.
http://www.hw-server.com/rs232 - 外文