Pass through video bigs
Added video bits to generic, since I am having to adjust this everywhere.
to_01 silenced sim, but caused build issues. If its invalid use 0.
Pass through some PBI signals needed for SDRAM
Expose pots, lightpen. Fix joystick bit ordering comments.
added ps2_keys_reg to sensitivity list (was missing)
Split ROM into its own process, to make it easier for Quartus to infer
Renamed poly_* to pokey_poly_* since it is part of pokey
Cleaned up ZPU into slightly more generic form, though still clearly atari core targetted. Added inital tb, though needs rom to verify more. MIST sector side removed, but should be possible with external changes. Now ZPU instead has lots of GPIO.
Allow palette selection - with one option GTIA direct to allow external scandouble (with less memory)
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