Ramps combines a mega with the powerful Mega platform and has plenty of room for extensions. Ramps is designed in such a way that it the entire electronics for a RepRap in one small controller at less cost to you and requires a smaller size. The modular design includes plug in stepper drivers and extruder control electronics on a mega shield, upgrade capability and changing of replacement parts for easy maintenance. Mega 2560 driver board is an ATmega2560 as microcontroller development board itself has 54 groups digital I/O input/output terminals (14 can be used as PWM outputs), 16 simulation than the input side, group 4 UARTs (hardware serial ports), with the 16 MHz crystal oscillator. With the bootloader the program directly via USB Downloads, without you needing to a other external writers undergo. After you have this panel connected to your Ramps, you don't need your pc it doesn't. The intelligent controller supplies power the SD card. All actions like calibration Achse movements can only with the rotary encoder on the Smart Controller.