新加坡IWOW公司TR800彩信模块的测试代码，基于AT89C51的，详细描述了AT命令的用法-TR800 Singapore company IWOW MMS module test code, based on AT89C51, and a detailed descr iption of the AT command usage

系统采用52单片机作为系统核心处理器，通过串口手法图像数据，利用那个TR800最为GSM模块，接收和发送图片。-System uses 52-core processor as the system microcontroller via serial port means the image data, using that TR800 most GSM module, to receive and send pictures.

XMODEM协议的实现，可用于嵌入式和单片机-XMODEM protocol implementation