![]() Patcher for Joust, Robotron and Defender Patches ROM Checksum Calculator for Williams games (2/7/95) The bookkeeping files have the correct default CMOS values except for Sinistarĭefender Bookkeeping/Game Adjustment RAM Dump NOTE: due to a logic error, the CMOS values at $CC00-$CFFF are not correct. (Theĭefender 'rug' memory test patterns are the same as the other games exceptįor the palette.) Here are the palette locations: These are all the same except for Defender, which creates a palette. Game has a default 'reset' palette that gets loaded very soon after a reset. Searching, palettes can be found in the ROM images and the RAM dumps. The color register RAM cannot be read by the CPU. To display the pictures correctly, you need a color palette. SinceĮach pixel requires 4 bits, that's 152 * 256 bytes (=$9800 bytes total).Ģ columns and 1 row are unused, leaving a screen size of 302x255. The screens are from $0000-97FF $0000 is the upper left corner of the Here's some info to decode the screen images in these dumps: Interestingly, the Sinistar fonts are decompressed Resetting all game defaults, the other just after starting a 1 player game.Įach dump contains the contents of RAM from $0000-BFFF, then zero paddingįrom $C000-CBFF (I wish I could read the color palettes at $C000-C015!), There are 2 files for each game: one dump on the bookkeeping screen after Sean Riddle's Home Page - Williams Games p3
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