OS_Byte 221 - 228 Key Codes (changes)

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Programmer's OS Reference SWI Manuals Calls

» Part OS_Byte 15 – SWI Calls

» OS OS_Byte 221 - 228

» Key CodesOS_Byte

Notes

Function keys generate these codes un-shifted.

Shift EORs the code with &10
Control EORs the code with &20

The cursor keys and copy only generate these codes if set up to act as function keys by calling OS_Byte 4 with R1=2.

&80 + Buffer value gives the character codes used by the Wimp. When reset occurs &CA (i.e. F10) is inserted into the input buffer.

Unlisted codes cannot be generated by the main keyboard, but can occur by:

• Using these OS_Byte calls to set keys to generate them
• Changing the numeric keypad base with OS_Byte 238
• Inserting bytes into the keyboard buffer with OS_Byte 138 and OS_Byte 153.
• Receiving bytes from the serial port (see also OS_Byte 181 to control serial input interpretation)

Note that page up and down effectively behave as Up and Down with shift toggled. In fact, it is impossible to distinguish shift/control combinations of page up and down with shift/control combinations of cursor up and down, which can prove frustrating.

See also

• Character Codes
• OS_Byte
• OS_Byte 4
• OS_Byte 138
• OS_Byte 153
• OS_Byte 181
• OS_Byte 221 - 228