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- Apple II
- Technical Notes
- _____________________________________________________________________________
- Developer Technical Support
-
-
- Apple IIGS
- #58: Keyboard Modifiers Register Anomaly
-
- Written by: Dave Lyons July 1989
-
- This Technical Note discusses an anomaly with the keyboard modifiers register
- at location $C025 which prevents it from always properly reflecting the state
- of the Control and Shift keys.
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-
- There are two cases where pressing the Control key turns on the Shift bit
- instead of the Control bit in the keyboard modifiers register:
-
- o An arrow key (or a Control key equivalent to an arrow key) is
- being held down and is repeating
- o The Space bar or Delete key is being held down and repeating with
- the Fast Space/Delete option selected in the Control Panel
-
- Since the Event Manager reads the modifiers byte, desktop applications may be
- affected by this anomaly.
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-
- Further Reference
- _____________________________________________________________________________
- o Apple IIGS Hardware Reference