Click on the File Portal link above and be directed to the registration page (note the instructions there for unpacking them). Enter your email address and a user name and you’ll receive an email with a direct link to the source files.
Click on the Errata link above to be directed to the erratta pages for the book.
Click on the relevant link above to open a pdf containing instruction set details for the ARM, Thumb and Vector Floating Point operations Save these onto you computer for printing or future reference.
A variety of good sites to loose yourself in. Gerph is fantastic reading especially if you want to lean more about the history of RISC OS development. Acorn Arcade has lost of good programs and practical news and views.
The Broadcom Datasheet has all the GPIO and other SoC data you need. The links opens a PDF so save a copy somewhere safe. The StrongHelp link will take you to a list of zip files you can download and install for use with StrongHelp.