Spiffie.org PTH BusPirate

is a universal serial interface created by Hack A Day. The bus pirate can interface with most serial interfaces (SPI, I2C, RS232, JTAG, 1wire, etc) and is controlled by a simple serial terminal. If you have a pc with a serial port and a bus pirate, you can talk to most serial chips.

• RS232 serial terminal interface
• 0.100” header for serial bus connections
• Software controlled 3.3v and 5v on board power supplies
• Selectable pull-ups on all four interface lines and selectable pull-up voltage
• Powered by a 7-20v DC power adapter
• Available as an easy to build kit
  • All through hole parts. No surface mount parts at all!
  • Professionally made 2 layer circuit board with solder-mask and silk-screen.
  • Pre-programmed PIC microcontroller with firmware and bootloader.

• The assembly directions and part list
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Currently available from Fundamental Logic's WebStore as a kit or just the PCB.