This book contains all the vital information you will need when using your 64. There are sections on : ASCII tables - Basic keywords - Basic error messages - Colour memory Conversion tables - Disk commands - Disk error  messages Disk formats - Extramon listing - Flow charting - Hex/Dec convertor - Hyperbolic functions - Memory maps - Memory architecture- M/C instruction set-M/C mnemonics-Powers tables - Cartridge slot - Joystick slot - RS232 standardsCentronics standards - Other output - Screen memory - Sound chip registers - Musical notes values - Sprite memory diagram. In short, everything you need to know about your machine.