Difference between revisions of "OSBYTE &CA"

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(Added Compact EXTEND key status.)
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[[Category:OSBYTE]]
 
[[Category:OSBYTE]]
===OSBYTE &CA (202) - Read/Write Keyboard Status===
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==OSBYTE &CA (202) - Read/Write Keyboard Status==
  
  This byte determines the current state of the keyboard modifier keys
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This byte determines the current state of the keyboard modifier keys
    b0 = BBC/Electron: reserved    Compact: b0-b2 = EXTEND status            RISC OS: Alt pressed
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  b0 = BBC/Elk/Master: res  Compact: b0-b2 = EXTEND status            RISC OS: Alt pressed
    b1 = BBC/Electron: reserved              1=EXTEND, 2=Shift-EXTEND        RISC OS: Scroll Lock set
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  b1 = BBC/Elk/Master: res              1=EXTEND, 2=Shift-EXTEND        RISC OS: Scroll Lock set
    b2 = BBC/Electron: reserved              3=Ctrl-EXTEND, 4=Sh-Ct-EXTEND  RISC OS: Num Lock set
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  b2 = BBC/Elk/Master: res              3=Ctrl-EXTEND, 4=Sh-Ct-EXTEND  RISC OS: Num Lock set
    b3 = Shift pressed
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  b3 = Shift pressed
    b4 = Caps lock off
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  b4 = Caps lock off
    b5 = Shift lock off
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  b5 = Shift lock off
        (ie, b5-4=01: Shift Lock on, 10: Caps Lock on, 11: No lock)
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      (ie, b5-4=01: Shift Lock on, 10: Caps Lock on, 11: No lock)
    b6 = BBC/RISC OS: Control pressed         Electron: FN pressed
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  b6 = BBC/Master/RISC OS: Control pressed             Electron: FN pressed
    b7 = Shift enable (Shift Caps or Shift Inverse)
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  b7 = Shift enable (Shift Caps or Shift Inverse)
 
    
 
    
  With Caps Lock on and Shift Enable off, Shift has no effect on letter keys.
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With Caps Lock on and Shift Enable off, Shift has no effect on letter keys.
  
 
===Examples===
 
===Examples===

Latest revision as of 23:06, 8 November 2020

OSBYTE &CA (202) - Read/Write Keyboard Status

This byte determines the current state of the keyboard modifier keys
  b0 = BBC/Elk/Master: res   Compact: b0-b2 = EXTEND status             RISC OS: Alt pressed
  b1 = BBC/Elk/Master: res              1=EXTEND, 2=Shift-EXTEND        RISC OS: Scroll Lock set
  b2 = BBC/Elk/Master: res              3=Ctrl-EXTEND, 4=Sh-Ct-EXTEND   RISC OS: Num Lock set
  b3 = Shift pressed
  b4 = Caps lock off
  b5 = Shift lock off
      (ie, b5-4=01: Shift Lock on, 10: Caps Lock on, 11: No lock)
  b6 = BBC/Master/RISC OS: Control pressed             Electron: FN pressed
  b7 = Shift enable (Shift Caps or Shift Inverse)
 
With Caps Lock on and Shift Enable off, Shift has no effect on letter keys.

Examples

  • *FX 202,16 turns Shift Lock on
  • *FX 202,32 turns Caps Lock on
  • *FX 202,48 turns Caps Lock/Shift Lock off
  • *FX 202,160 turns Shift Caps on


Jgharston 22:48, 26 May 2009 (UTC) Jgharston (talk) 20:18, 13 June 2016 (UTC)