好的操作系统

汽车电子转速表电路，包括原理图和印制板图，使汽车电子的典型电路，值得学习-automotive electronic tachometer circuit, including schematic and PCB plans, the typical automobile electronic circuits, it is worth learning

51+PDIUSBD12源代码-51 PDIUSBD12 source code

ARMlpc2300技术笔记上册例程I2C读写24C256-ARMlpc2300 technical notes on the book to read and write I2C routines 24C256

arm7 bootloader source, very good-arm7 Bootloader source, very good

AVR和PC机并口以EPP方式通信的源代码，与大家共享-AVR and the PC parallel port to EPP mode machine communication source code, and share

用C来实现实时时钟。对比与上个汇编语言。-Using C to achieve real-time clock.

89c52 eprom 的子程序 可以参考一下 -89C52 eprom the subroutine can reference

C8051f020从ISD4004分段地址0000H 开始放音，再连续放音120秒后停止放音-C8051F020 from sub-ISD4004 Address 0000H to start playback, then playback for 120 seconds after the playback

ping utility used for pinging proxy