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This is all stored on disc as sequential lines without numbers (use •TYPE to confirm this). The command •OPT4,3 must now be used in order to set the disc correctly, so that pressing and together will cause the file to be •EXECed. Do so and you should see the various screen changes occur, with the commands appearing in sequence on the screen. A file created by •BUILD can only be edited by a word processor (it is already in the correct format), or must be rewritten from scratch. If a word processor is used you must be careful not to leave any word processor-specific codes or rulers in the text.

It is important that this program is saved before it is run, as it may cause a crash even when running correctly. Position the tape correctly, run this fix, and then •SAVE the now loaded and unlocked program. 2 to elicit the correct file addresses. S. 1 are the commands and variables provided by BBC Basic to allow various file manipulations. All are equivalent to one or other operating system call ( q. ), although many of the calls support more features than does the equivalent Basic command.

The second option is to use screen memory. The screen must be cleared and a text window defined in the lower part of the screen. The routine will sit in memory equivalent to the top of the screen and so cannot be overwritten when this window is in use. The move routine is then typed in with PAGE set to &7C00, and HIMEM set to &7D00. The combination is *SAVEd and *LOADed as before, except that PAGE=&7C00, and HIMEM=&7D00 should be used in the leader program before the combination program is *LOADed and then RUN.

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