Reference section 33 BASIC keywords alphabetical summary 170 34 VDU drivers 347 VDU code summary 348 Detailed description 349 35 Cassette files 360 Cassette motor control 360 Recording levels 360 Playback volume and tone 360 Keeping an index of programs 360 Saving a BASIC program 361 Saving a section of memory 362 Loading a BASIC program 362 Loading a machine code program 363 Loading and running a BASIC program 363 Loading and running a machine code program 364 Using a cassette file to provide keyboard input 364 Reading cassette data files 365 Testing for end of file 365 Storing data on tape 366 Recording single characters on tape 366 File names 366 Responses to errors 367 Changing responses to errors 368 Cassette tape format 369 36 Changing filing systems 370 37 How to merge two BASIC programs 371 38 Using printers 373 Connecting the printer to the computer 373 A parallel printer cable 374 Parallel printer connections 375 Telling the computer whether you are using a parallel or serial printer 376 Telling the computer to copy everything to the printer 377 Characters not sent to the printer 377