Difference between revisions of "OSBYTE &AD"

Revision as of 20:52, 13 September 2019

On entry: newvalue = (oldvalue AND Y) EOR X

On exit: X=high byte of address of keyboard translation table. See OSBYTE &AC.

@@ Line 1: / Line 1: @@
-[[Category:OSBYTE]]
+[[Category:OSBYTE]]__NOTOC__
-OSBYTE &AD (173) - Read address of keyboard table
+== OSBYTE &AD (173) - Read address of keyboard translation table ==
+''On entry:'' '''newvalue''' = ('''oldvalue''' AND Y) EOR X
-On exit X=the high byte of OSByte &AC
+'' On exit:'' X=high byte of address of keyboard translation table. See [[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==
+* [[OSBYTE &AC]]
 * http://mdfs.net/Docs/Comp/BBC/OsbyteA6
 [[User:Jgharston|Jgharston]] 22:24, 26 May 2009 (UTC)
+[[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 21:52, 13 September 2019 (CEST)