A fast and easily customised operating system
for ARM devices
Keyboard Status
Programmer's Reference Manuals
» Part 15 – SWI Calls
» OS
» OS_Byte
» OS_Byte 202
» Keyboard Status
Keyboard Status
| Bit | Value | Meaning |
|---|---|---|
| 0 | - | Reserved for the keyboard handler, must be preserved when writing |
| 1 | 0 | Scroll Lock off |
| 1 | Scroll Lock on | |
| 2 | 0 | Num Lock on |
| 1 | Num Lock off | |
| 3 | 0 | Shift off |
| 1 | Shift on | |
| 4 | 0 | Caps Lock on |
| 1 | Caps Lock off | |
| 5 | 0 | Kana lock (Hiragana entry) |
| 1 | Romanji lock (Latin entry, as in UK) | |
| 6 | 0 | Control off |
| 1 | Control on | |
| 7 | 0 | Shift enable |
| 1 | Shift disabled |
Notes
On means LED on or key pressed, off the opposite. If Caps Lock is on and Shift Enable off, Shift will have no effect on the letters, if Shift enable is on, you’ll get lower case.