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PS2Driver
Introduction
The PS2Driver module provides support for PS 2 mice and keyboards as documented within PRM 5a-229. The driver has been extended to support the 'scroll wheel' and '5 button' mice commonly in use. This extension is documented within the PointerDevices document.
Additional keys
From RISC OS 4, a number of additional keys have been returned by the PS 2 Driver (and other keyboard drivers). The following keys are now provided through the internal interfaces :
low level key internal (decimal) HID
Windows left &68 125 &700E4
Windows right &69 126 &700E7
Menu &6A 127 &70065
No convert &6B 109 &7008B
Convert &6C 110 &7008A
Kana &6D 111 &70088
Yen/Bar &1D 46 &70089
\ _ &6E 95 &70087
ASPI Power - - &10081
ASPI Sleep - - &10082
ASPI Wake - - &10083
Scan next track - - &C00B5
Scan previous track - - &C00B6
Stop - - &C00B7
Play/pause - - &C00CD
Mute - - &C00E2
Vol+ - - &C00E9
Vol- - - &C00EA
Media select - - &C0183
Mail - - &C018A
Calculator - - &C0192
My computer - - &C0194
Browser search - - &C0221
Browser home - - &C0223
Browser back - - &C0224
Browser forward - - &C0225
Browser stop - - &C0226
Browser refresh - - &C0227
Browser favourites - - &C0228
The Yen/Bar key is to the left of backspace (ie where the £ sign was on Archimedes keyboards). It hence resurrects the old &1D low level code.
The \ _ key is to the left of the right shift key (analogous to the \ | key on UK keyboards).
HID values can be used through the KeyInput interfaces. Multimedia keys have not been exposed to the regular keyboard interfaces, for example, the wimp key processing.
Within the desktop environment, the following key codes will be returned for the additional keys :
Shift- Ctrl- Shift-Ctrl
Key code key code key code key code
Windows left &1C0 &1D0 &1E0 &1F0
Windows right &1D0 &1C0 &1F0 &1E0
Menu &1C1 &1D1 &1E1 &1F1
No convert &1C2 &1D2 &1E2 &1F2
Convert &1C3 &1D3 &1E3 &1F3
Kana &1C4 &1D4 &1E4 &1F4
'Windows' and 'Menu' keys
In order to be consistent, the Windows and Menu keys should operate in the following manner :
Key Domain Effect
Windows-alone OS-specific Display a system menu *
Windows-Shift/Ctrl OS-specific Reserved
Windows-0-9 Hardware Reserved
Windows-<nonshift> User User expansion
Menu-alone OS-specific Display a context menu *
Menu-Shift/Ctrl Application Application expansion
Menu-<nonshift> Reserved Reserved
* Not presently implemented
Left and right Windows keys should be treated identically, but may be distinguished by user-expansion software where necessary. This behaviour is consistent with the recommended behaviour on other systems and should ensure that the users expectations are met when transferring between environments.
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