Arduino-style API

This example summarizes the Arduino-style API implemented so far:

void setup(void)
{
    pinMode(LED_BUILTIN, OUTPUT);
}
 
void loop(void)
{
    digitalWrite(LED_BUILTIN, HIGH);
    delay(1000);
    digitalWrite(LED_BUILTIN, LOW);
    delay(1000);
}

Commodore User Port

1	2	3	4	5	6	7	8	9	10	11	12
GND	_(1)_	_(1)_	_(1)_	_(1)_	_(1)_	_(1)_	_(1)_	_(1)_	_(1)_	_(1)_	GND
GND	_(2)_	I/O 0	I/O 1	I/O 2	I/O 3	I/O 4	I/O 5	I/O 6	I/O 7	_(2)_	GND
A	B	C	D	E	F	H	J	K	L	M	N

_(1)_ Pins of the upper row differ significantly between systems. Some of them can be used as additional input or output lines.

_(2)_ Pins B and M of the lower row are available on all systems, but with different constraints.

I/O pins from C to L are connected to one port of a VIA or CIA chip on all systems and can be independently programmed as input or output.

Acknowledgements

This project is inspired by the Arduino programming model and API. The setup() / loop() structure and function naming follow the conventions popularized by the Arduino platform.

Arduino is an open-source project developed by the Arduino team: https://www.arduino.cc/

This project is not affiliated with or endorsed by Arduino.