text and source code section

• VCS.H and MARIA.H
  These files define symbolic names for all the registers in the VCS 2600 and the VCS 7800 in MARIA mode. You will need to have them in the same directory as the source code files from this page, when you try to assemble those.
  
  
• BACKDOOR.DAS
  This example source code demonstrates how you can use small parts of certain existing 7800 games to make your own game pass the encrypted signature check in the NTSC 7800 console. This is nessessary, if you want to be able to play your homebrew games on an unmodified NTSC 7800 console. PAL consoles don't check for an ecrypted signature. Since it technically still is illegal to distribute ROM images of commercial games, no binary is included with this demo.
  
  
• frequency and waveform guide
  This text describes how I think the audio part of the TIA works. It inlcudes tables with frequencies and note values for all available sound-type and frequency devider values. This might be usefull, when you want to create melodies for your game.
  
  
• 7800 bankswitching guide
  This text describes the different bankswitching types that were used in 7800 cartridges. Also it lists the bankswitching type for all known games.
  
  
• RMT POKEY player test for 7800
  This example program shows you how to use the POKEY player routine from Radek Sterba's Raster Music Tracker. Radek kindly allowed me to use one of his songs for this. The player routine was changed to work on a ROM based system like the 7800, so it should be easily possible to use it in 5200 programs too.