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##### Previous generation Wiring boards

There are two previous generations of Wiring boards: The Wiring/WiringMini V1.0 based on the atmega128 microcontroller and the Wiring V1.1 Sparkfun board based on the atmega1281/atmega2561 microcontrollers. With 53 I/O pins, 8 analog inputs, 2 hardware serial ports, 6 PWM (analog outputs), SPI, TWI, 8 external interrupts pins, power regulation with output for 5V (and 3.3V in Wiring V1.1 Sparkfun). See the comparison.

Wiring V1.1 Sparkfun pin layout

Wiring V1.0 Rev 0004 pin layout (The WiringMini has the same pin layout)