Types of Reset

Under RISC OS 3.7 and before a number of special types of reset were available to the user. Each of these reset types was triggered by holding a key during a reset. In particular :

R reset all OS CMOS
Delete reset all CMOS
T as R but configure the opposite video Sync
Copy as Delete but configure the opposite video Sync
Keypad 0-9       change configured monitor type to specified number
Keypad . change mode, sync and monitor type to Auto
Shift reverse the operation of automated boot
Keypad * force start up to a command line

In addition, under RISC OS 3.7 and before power on reset, Break and the reset button performed slightly differently, allowing 'soft' or 'hard' resets to be performed. From RISC OS 4, the operating system treats all resets as being 'hard'.

With RISC OS 4, the configuration of the monitor type was removed.

With RISC OS 4.15, the system will boot into a menu environment ('Boot Menu') when the shift key is used. This can be used to boot from alternative devices or to configure different settings.

With RISC OS 4.42, the only operations of these which remain are the Delete, Shift and Keypad *.

In order to support multiple displays it is possible to configure the display which the system will use on startup. This can be a problem if the display configured is no longer present (for example, because the podule has been removed). If the 0 key (not the Keypad 0) is held during startup the display will (for this session) be forced to display number 0.

This documentation is copyright 3QD Developments Ltd 2013 and may not be reproduced or published in any form without the copyright holders permission. RISC OS is subject to continuous development and improvement as such all information is reproduced by 3QD Developments Ltd in good faith and is believed to be correct at the time of publication E&OE. 3QD Developments Ltd cannot accept any liability for any loss or damage arising from the use of any information provided as part of the RISC OS Documentation.

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