Hi, I am new to the Pic and I would like to ask you for help: My project: I will use a 16C84 Pic to read data from a data acquisition unit. This data acquisition unit sends every 60 seconds data through a serial port. I would like to read the data with a PIC and than store these data in a external EEPROM via IIC bus. I am planning to use the new 24AAxx chip with 256k memory.This EEPROM should function as a ringbuffer. The data from the serial port will be stored and when the memory is full, it should start overwrite the datas and so on. I will connect also a RS232 transceiver chip to the PIC so that I can read the data in the EEPROM through a mobile telephone. I need to know: 1. How does the IIC routine has to look like. 2. How can I design a ringbuffer with a eeprom connected via IIC bus. Thanks in advance for your help. Best Regards, Thomas