Couldn't Bring MAX7219 under Control to Display 2?

You must be one of those apocryphal programmers who get paid by the line-of-code. :smiley:

void loop()
{
  clkIn(0x0C01);  //normal Mode xxxx 1100 00000001
  clkIn(0x0900);  //no-decode mode xxxx 1001 00000000
  clkIn(0x0AFF); //max intensity xxxx 1010 11111111
  clkIn(0x0B07); //scan limit    //8-digit : xxxx 1011 00001111
  clkIn(0x016D); //xxxx 0001 01011011  ; digit 2 at DP0 position
}

(I still think the select/load code looks wrong)