Hi everyone. I'm new to this list however I'm quite skilled with electronic hardware and programming. Some of you may be involved with radio controlled (RC) modelling and thus will know that I am on about. For those who don't... Modern RC transmitters are computerised and use EEPROM memory modules for storing user settings. Futaba (probably the RC market leader) uses two types of these modules 16Kbit and 64Kbit. So, why clone them? Because the 16Kbit memory module is sold for 45GBP and all it has inside is a I2C interfaced 24C16 EEPROM. However things get more complex with the 64Kbit module. Futaba probably realised that people easily cloned the 16Kbit modules and thus they implemented their own command structure for the 64Kbit module. Although I2C is still used a 24C64 doesn't work. I have captured the communication between the radio and the computer and I found that Futaba got rid of the chip select bits and then compressed the 13 address bits and R/W* into two bytes instead of the 3 used by 24C64. For their implementation they used a Hitachi H8/3101 microcontroller with 8KByte internal EEPROOM to emulate an EEPROM chip. No PIC has such amount of internal EEPROM thus I tried to use an external 24C64 on a second I2C bus. While the PIC accesses the 24C64 it keeps the SCL line (to the radio) low to force the radio's computer into wait states. This is fine according to I2C specification, but the radio doesn't like it. Time for my questions.... A. Is there any PIC that has 8KByte of internal EEPROM? (just in case I missed it) B. If not, is there any other uC which does? (apart from the H8) which... 1. I can't easily source in UK 2. Hitachi still hasn't send me the datasheet after several emails and two months waiting. 3. No fee development tools are on the Internet. Any other suggestions are welcome. Have a look at my web page www.model-gadgets.com Many thanks for reading. -Angelos -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.