It is always good to have handy microcontroller development board where you could test, debug embedded programs. Generally speaking development boards have to be universal and also convenient for interfacing. So usually when people make these tings usually build in some periphery to be ready to use like RS232 interface, MMC/SD slots.
So here is one development board with ATmega128 microcontroller which is small but has lots of functionality ready to go like RS232, RS485, ISP, JTAG, MMC/SD connectors. Also it has 62kB of external RAM – so you can run really serious programs without wary. Don’t forget other interfaces like I/O, I2C, SPI, and RTC that are positioned in two additional pin-headers.