OSBYTE &AD

OSBYTE &AD (173) - Read address of keyboard table

On exit X=the high byte of OSByte &AC

With an International Keyboard Driver, if bit 7 is clear (implying a keyboard table in low memory), the MOS keyboard handler issues Service Call &30 to translate keypresses. With an International Keyboard Driver present, this location holds:

b7 = 0 to indicate international keyboard driver being used b6 = a flag b5-b0 = keyboard number

See Also

• http://mdfs.net/Docs/Comp/BBC/OsbyteA6

Jgharston 22:24, 26 May 2009 (UTC)