ColecoVision Cartridge Header - Technical Information
9This video is made with ColecoVision Programmer's Manual documentation. Useful information for curious and programmers. Narrated by a robot voice generated with AnalogX - Say It simple program. This video is for education purpose. If you don't like it, just too bad!
8000 - CARTRIDGE, if bytes AA and 55 then it's game type which mean using the full boot up procedure that include the logo display with the game name. If bytes 55 and AA then it's a test type which means not doing the boot up procedure, not display typical colecovision title screen, and go directly to run the game. If the cartridge is badly inserted or if there is no cartridge at all then the first two bytes do have a high chance to not be read as game or test type, which gives an invalid type, and display the "insert cartridge" message.