A step by step guide to Commodore Business Machines (CBM) computers from the original PET to the later CBM 3000, 4000 and 8000 series, the 2040 and 8050 floppy disk drives and the programmable printers. It incorporates a step-by-step BASIC programming tutorial, teaching both BASIC and CBM BASIC. The book includes chapters on: Introduction to CBM computers, Operating them, Screen Editing, Programming them, Making the most of CBM features, Peripheral devices (cassette drives, floppy disk drives and printers), CBM computer system organisation and CBM BASIC. Apendices provide CBM character codes, Error messages, BASIC bibliography, CBM newsletters and references, Conversion tables and Information on the Revision Level 2 ROMs.