I fly RC too, I never saw the point in making a 64k clone, just make a few 16k clones instead. It is much easier and probably cheaper. Also it is more convenient as you can keep a few in a safe place with all your programs backed up. Justin. BTW if you repost with [PIC]: in front of your subject you will get a greater response. ----- Original Message ----- From: "Angelos Gonias" To: Sent: Sunday, July 08, 2001 10:16 AM Subject: FUTABA CAMPAC 64K > 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. > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.