Wow, that's a huge design idea to make things easy, from Atari side! In the c64, apart from what you said, there is also the issue that charset is read only, you have to physically move it in some other ram place, byte per byte, then you can edit the chars you want and you have to tell the Vic that charset is there... It's something we do in ASM because it requires a lot of time in basic, besides the space taken by instructions, that make it not so sustainable for a pur80. Anyway, thanks for these informations, I don't know the Atari world, it's been nice to learn something new. Have a good challenge, see you in these pages :-)