Tonym1972

If your using the OS to create the screen (Basic's graphics command), then locations 88 and 89 will hold its location, so... PLAYFLD = PEEK(88) + PEEK(89)*256 If your creating your own Display list, then its your responsibility to find a safe place in RAM for the playfield. Antic almost certainly has a few examples showing how to do that. If not, search online for "De Re Atari" which covers the topics your interested in, in quite some detail. Disk is probably the better way to go if your looking to mix assembler with basic, and it has the advantage of allowing you to segment your data.

@Popmilo I read that to mean minimum CPU intervention, which gives me an idea. So lets assume that a gun was put to my head, and I was forced to make a plasma in Pete's new Cmode (which none of us yet knows the trick for)... how will I fake it and keep my head. With a Horzontal resolution of 80, the GTIA modes seem a good starting point. The usual blank line artifact from an APAC setup is missing, but thats okay I always liked Pryzm (alternate mode 9 and 11 in a VBI as opposed to per scanline with a DLI). Horizontal resolution appears to be 48 or 50 (depending on who counts) but that discrepancy doesn't matter, we can fake that with the old GTIA 9++ trick of setting VS for the modeline, and setting vscroll to trick Antic into repeating the last scanline 3 more times. So that would give 80x48 (or 50!) at a perceived 256 colours, requiring a simple DLI once every 4 scanlines, a simple VBI, approximately 4k for the screen display, and 3 scanlines where Antics DMA would steal very few cycles from the CPU. Perfect for a plasma Edit: "3 scanlines where Antics DMA would steal very few cycles from the CPU" should be read as for 75% (approximately) Antics DMA would steal very few cycles from the 6502.