Difference between revisions of "OSBYTE &AD"
(Refer to OSBYTE &AC for full details.) |
(Keyboard number.) |
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''On entry:'' '''newvalue''' = ('''oldvalue''' AND Y) EOR X | ''On entry:'' '''newvalue''' = ('''oldvalue''' AND Y) EOR X | ||
| − | '' On exit:'' X=high byte of address of keyboard translation table. See [[OSBYTE &AC]]. | + | '' On exit:'' X=high byte of address of keyboard translation table or keyboard number. See [[OSBYTE &AC]]. |
| + | |||
| + | The top bits indicate if the MOS keyboard driver is being used or an alternative keyboard driver is being used. | ||
| + | * If Y=%11xxxxxx, MOS keyboard driver | ||
| + | * If Y=%10xxxxxx, sideways ROM keyboard driver | ||
| + | * If Y=%0xxxxxxx, International keyboard driver. | ||
| + | |||
| + | If Y<>%11xxxxxx (ie Y < &C0), the byte holds the keyboard number and implementation-specific flags: | ||
| + | * b0-b4 : keyboard number &00-&1F, &00=none or default | ||
| + | * b5 | ||
| + | * b6 : International keyboard drive: NUL needed flag | ||
| + | * b6-b7 : MOS or external keyboard driver | ||
==See Also== | ==See Also== | ||
| Line 11: | Line 22: | ||
[[User:Jgharston|Jgharston]] 22:24, 26 May 2009 (UTC) | [[User:Jgharston|Jgharston]] 22:24, 26 May 2009 (UTC) | ||
[[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 21:52, 13 September 2019 (CEST) | [[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 21:52, 13 September 2019 (CEST) | ||
| + | [[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 03:26, 15 October 2020 (CEST) | ||
Revision as of 02:26, 15 October 2020
OSBYTE &AD (173) - Read address of keyboard translation table
On entry: newvalue = (oldvalue AND Y) EOR X
On exit: X=high byte of address of keyboard translation table or keyboard number. See OSBYTE &AC.
The top bits indicate if the MOS keyboard driver is being used or an alternative keyboard driver is being used.
- If Y=%11xxxxxx, MOS keyboard driver
- If Y=%10xxxxxx, sideways ROM keyboard driver
- If Y=%0xxxxxxx, International keyboard driver.
If Y<>%11xxxxxx (ie Y < &C0), the byte holds the keyboard number and implementation-specific flags:
- b0-b4 : keyboard number &00-&1F, &00=none or default
- b5
- b6 : International keyboard drive: NUL needed flag
- b6-b7 : MOS or external keyboard driver
See Also
Jgharston 22:24, 26 May 2009 (UTC) Jgharston (talk) 21:52, 13 September 2019 (CEST) Jgharston (talk) 03:26, 15 October 2020 (CEST)
