The Application Tutorial and Listings Book for RISC OS Computers www.dragdrop.co.uk The Application Tutorial and Listings Book for RISC OS Computers © 2021 Chris Dewhurst ISBN 9781800681309 First published 2021 by Independent Publishing Network (IPN) https://bookisbn.org.uk The author is indebted to the past and present writers of fine software applications for the RISC OS computer platform, without which this book would have been very difficult to produce. Produced on RISC OS computers using Impression Style, Draw, Artworks, PostScript3 printer driver, and the Kyocera Ecosys M5521cdn multifunctional device. All Trademarks and Registered Trademarks are hereby acknowledged. Raspberry Pi anmd the Raspberry Pi logos are registered trademarks of the Raspberry Pi Foundation. Printed and bound in Great Britain by Drag ’N Drop Publications, Dingwall, Scotland. www.dragdrop.co.uk
[email protected] Typeset in 11/12pt Plato. Acknowledgements This book would not have been possible without the following people. Thanks to Tony Bartram at www.amcog.co.uk for help in testing the Envelope Editor (Chapter 8) which was written for the RDSP module (written by Tony). Thanks to Geoff McVeigh for help testing the Plotter and Notepad (Chapter 10). Thanks to the fiendly assistance of members of the forum at riscosopen.org.uk, not forgetting the work done by ROOL on RISC OS itself. Finally thanks to Sybil Harris at www.sybilharris.com for once again providing the amazing front cover artwork. Contents Acknowledgements . 3 1 . Introduction . 11 Programs . 11 Equipment . 12 Variable Names. 12 Typing in programs Edit. 12 Currently Selected Directory. 13 Checksum Routine .