A68064 Datasheet -

Based on errata and application notes linked from the A68064 datasheet:

The A68064 operates as a simple SPI-like device without a dedicated chip select (instead using Output Enable). Here’s the standard workflow:

The instruction set of the A68064 is based on the 6502, with 56 basic instructions that include: a68064 datasheet

Below is a simple Arduino sketch demonstrating how to control 8 outputs using three digital pins, as implied by the datasheet’s serial interface:

// A68064 Driver Example
int dataPin = 2;
int clockPin = 3;
int strobePin = 4;
int enablePin = 5;
void setup() 
pinMode(dataPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(strobePin, OUTPUT);
pinMode(enablePin, OUTPUT); Based on errata and application notes linked from
digitalWrite(enablePin, LOW); // Enable outputs
digitalWrite(strobePin, LOW);

void writeA68064(byte data) 
// Shift out 8 bits, MSB first (output 1 = MSB)
for (int i = 7; i >= 0; i--) 
digitalWrite(dataPin, (data >> i) & 1);
digitalWrite(clockPin, HIGH);
delayMicroseconds(1);
digitalWrite(clockPin, LOW);
// Latch the data
digitalWrite(strobePin, HIGH);
delayMicroseconds(1);
digitalWrite(strobePin, LOW);
 void writeA68064(byte data) // Shift out 8 bits,
void loop() 
writeA68064(0b10101010); // Alternate outputs ON
delay(1000);
writeA68064(0b01010101); // Alternate outputs OFF
delay(1000);