Introducing picocart - it works

[JasonACT]

I'm not quite sure why the memory test was passing, it must be very close timing, or I had a bug in the '612 chip's 16 bit register code...  Changing the code to be simpler 8 bit registers works now:

 

 

 

Actually, the 8 bit code is doing quite a bit less, no need for bounds checking, so two less bit-mask ops.