Difference between revisions of "OSBYTE &17"
m (1 revision) |
(Added exit conditions.) |
||
(One intermediate revision by one other user not shown) | |||
Line 4: | Line 4: | ||
This call decrements a counter, which when zero will stop the (type &15) | This call decrements a counter, which when zero will stop the (type &15) | ||
polling calls from being sent to ROMs at 100Hz. | polling calls from being sent to ROMs at 100Hz. | ||
+ | |||
+ | On exit: | ||
+ | X=preserved - Polling semaphore exists | ||
+ | X=&FF - Polling semaphore not implemented | ||
==See Also== | ==See Also== | ||
+ | * [[OSBYTE &16]] - Increment Polling Semaphore | ||
* http://mdfs.net/Docs/Comp/BBC/Osbyte00 | * http://mdfs.net/Docs/Comp/BBC/Osbyte00 | ||
[[User:Jgharston|Jgharston]] 21:32, 26 May 2009 (UTC) | [[User:Jgharston|Jgharston]] 21:32, 26 May 2009 (UTC) | ||
+ | [[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 02:04, 6 November 2020 (CET) |
Latest revision as of 02:04, 6 November 2020
OSBYTE &17 (23) - Decrement Polling Semaphore
This call decrements a counter, which when zero will stop the (type &15) polling calls from being sent to ROMs at 100Hz. On exit: X=preserved - Polling semaphore exists X=&FF - Polling semaphore not implemented
See Also
- OSBYTE &16 - Increment Polling Semaphore
- http://mdfs.net/Docs/Comp/BBC/Osbyte00
Jgharston 21:32, 26 May 2009 (UTC) Jgharston (talk) 02:04, 6 November 2020 (CET)