Bari Ari wrote:
I2C Bus to USB or serial adapters http://www.mcc-us.com/catalog.htm#I2C%20Bus%20Host%20Adapters
I2C/SPI Host Adapter http://www.totalphase.com/products/aardvark/
I2C Bus to USB or serial adapters http://www.telos.info/products/
QBridge-I2C-USB http://www.qprotos.com/index.html
This adapter even has Linux tools: USB-I2C/SPI/GPIO Interface Adapter http://www.diolan.com/i2c/u2c12.html
Those are a lot of interesting links. They are all pretty expensive, though. A bargain basement option would be an AVR butterfly. The Atmel micros have UART/SPI/I2C built in, and the butterfly is 20USD. You could even probably achieve USB with this, there is software bitbang (!) USB available for AVR.
http://www.dwelch.com/avr/ http://www.obdev.at/products/avrusb/projects.html http://www.harbaum.org/till/i2c_tiny_usb/
with a probe like this that slides into the dimm socket: http://www.busboards.com/products/memory/ddrii/ddrii400dc/ddriidc.jpg http://www.busboards.com/products/memory/ddrii/ddrii400dc/index.html
That one is a little bit out there. That board is probably $10K, and you need a $100K Tek Logic Analyzer to use it. :)