Difference between revisions of "OSBYTE &16"
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OSBYTE &16 (22) - Increment Polling Semaphore | OSBYTE &16 (22) - Increment Polling Semaphore | ||
| − | This call increments a counter, which if non | + | This call increments a counter, which if non zero will cause 100 service |
| − | + | calls (type &15) per second to be sent the paged ROMs. This allows a way | |
for ROMs to poll hardware which doesn't offer interrupts. | for ROMs to poll hardware which doesn't offer interrupts. | ||
| − | + | On exit: | |
| + | X=preserved - Polling semaphore exists | ||
| + | X=&FF - Polling semaphore not implemented | ||
==See Also== | ==See Also== | ||
| − | * [[ | + | * [[OSBYTE &17]] - Decrement Polling Semaphore |
| − | * | + | * http://mdfs.net/Docs/Comp/BBC/Osbyte00 |
| − | |||
| − | |||
[[User:Jgharston|Jgharston]] 21:31, 26 May 2009 (UTC) | [[User:Jgharston|Jgharston]] 21:31, 26 May 2009 (UTC) | ||
| + | [[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 02:03, 6 November 2020 (CET) | ||
Latest revision as of 03:03, 6 November 2020
OSBYTE &16 (22) - Increment Polling Semaphore
This call increments a counter, which if non zero will cause 100 service
calls (type &15) per second to be sent the paged ROMs. This allows a way
for ROMs to poll hardware which doesn't offer interrupts.
On exit:
X=preserved - Polling semaphore exists
X=&FF - Polling semaphore not implemented
See Also
- OSBYTE &17 - Decrement Polling Semaphore
- http://mdfs.net/Docs/Comp/BBC/Osbyte00
Jgharston 21:31, 26 May 2009 (UTC) Jgharston (talk) 02:03, 6 November 2020 (CET)
