void SendByte_SN76490(uint8_t data)
{
  digitalWrite(CHIP_EN, LOW); // Enable CHIP (active low)
  
  while (digitalRead(READY_PIN)){};  // Wait until READY is LOW 
  
  // Put data on data bus. 
  digitalWrite(DATA7, data & (1<<0) ? HIGH:LOW);
  digitalWrite(DATA6, data & (1<<1) ? HIGH:LOW);
  digitalWrite(DATA5, data & (1<<2) ? HIGH:LOW);
  digitalWrite(DATA4, data & (1<<3) ? HIGH:LOW);
  digitalWrite(DATA3, data & (1<<4) ? HIGH:LOW);
  digitalWrite(DATA2, data & (1<<5) ? HIGH:LOW);
  digitalWrite(DATA1, data & (1<<6) ? HIGH:LOW);
  digitalWrite(DATA0, data & (1<<7) ? HIGH:LOW);
  
  // Pulse WRITE_EN
  digitalWrite(WRITE_EN,LOW);
  delayMicroseconds(100);
  digitalWrite(WRITE_EN,HIGH);
 
  // Wait until READY is HIGH 
  digitalWrite(CHIP_EN,HIGH);
  while(!digitalRead(READY_PIN)){};// Make sure READY is HIGH
}