Bit of a light bulb moment with the relationship between hex and binary though...hadn't realised how easily 16bit binary could be displayed using just four hex digits...a real "Aha! So that's why they use it" moment...
But I'm still struggling to understand what that sketch is doing...every time I think I'm getting there, I try and apply what Iive learned to show a simple run of digits 1 to 0 on the dispaly and...no..that's gibberish, so obviously I still dont get it.
I swear I used to be smarter than this.