The RISC OS operating system
RISC OS stands for Reduced Instruction Set Computer Operating System. RISC OS consists of three layers
RISC OS allows you to load an application from a disc, for example, and then determines how that program is run, using your input from the mouse and keyboard. When you've finished, it lets you save your work back to a disc, in a file.
Usually you'll perform the following techniques with the Select (lefthand) mouse button, unless instructed otherwise in the text:
Often, you'll be told to Press Menu over an object. This means move the pointer over the object and press the Menu button.
Menu names and options are shown in bold type. The path you need to take through a series of submenus to reach an option is described.
Before using your computer, you should read the Guidelines for safe operation printed near the front of your Welcome Guide.
Freeing up more disc space
If you require more hard disc space, you can free up space by deleting directories that you don't often use, such as the Video, Images and Sound directories. Before deleting them, you should always take a backup of any files, directories or applications that you may wish to keep (see Backing up discs on page 81). The Welcome Guide shows you how to delete files and directories.
If your computer halts at the command line when you switch it on (the screen is blank except for a * prompt and a flashing cursor), it may be because your hard disc is full. Type *Desktop to display the desktop. Free up some space on your disc then reboot the computer.
If your computer starts behaving unexpectedly, or doesn't do anything at all, see If things go wrong in the Welcome Guide. This has solutions to most common problems.
If the screen goes blank
If your screen goes blank while you are not using it, it's probably because the screenblanker has automatically switched off the display to save electricity and wear on the screen. You can restore the display by moving the mouse or pressing any key on the keyboard (e.g. the Shift key).
Getting out of a mess (resetting the computer)
Very occasionally your computer may 'hang up' - where pressing a key or mouse button has no effect. You can normally cure this by resetting the computer. To do this, first try pressing Alt-Break or, if that fails, Ctrl-Break. If this fails, press the Reset button. Your Welcome Guide shows you where this is. Alternatively, turn the computer off, wait a short while (30 seconds) and turn on again. When you reset the computer, any unsaved data is lost. For more information about resetting your computer refer.
The !Help application
The !Help application provides on-screen information as you use your computer. You can use this to get help on the desktop and most applications. For information refer to Help on page 357.
The Help option on the Filer menu
You can get help on some applications by clicking Menu over an application's icon in a directory display and choosing App./Help. For example, here is the help text for the !Chars application.
To support Acorn computers, your supplier should have the following products available: