This article is from the newsnet system. It contains information about SDMCTL. Tidied by Dean Garraghty.¢-----------------------------------¢¢About the overscan . . . you can set bits in SDMCTL (loc. 559 ($22F)) to enable the different line widths. Here are the bits:¢¢0,1 : Playfield width (0 = no¢ playfield)¢ (1 = narrow; 128 color¢ clocks wide)¢ (2 = standard; 160 color¢ clocks wide)¢ (3 = wide; 192 color clocks¢ wide (enough for full¢ overscan))¢2 : Enable missile DMA¢3 : Enable player DMA¢4 : One-line player resolution¢5 : Enable Antic DMA¢¢SDMCTL is the shadow regiser for DMACTL (54272 ($D400)).¢¢This info from _Mapping the Atari_ by Ian Chadwick. Get a copy if you can!!¢It's a great book.¢ __¢ (_¢ __)teve¢¢¢Stephen Miller.¢
