Allow palette selection - with one option GTIA direct to allow external scandouble (with less memory)
Renamed sim script to match
Compiled/ran helloworld in sim. Appears fine...
First cut at simple toplevel for the atari800xl - needs checking with isim...
Make these generic to support Replay (28MHz) and the rest (57MHz)
Current unmerged vhdl for my Atari800 core and start at merging them into one tree with a common core