Difference between revisions of "OSBYTE &17"

From BeebWiki
Jump to: navigation, search
m (1 revision)
(Added exit conditions.)
 
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

Jgharston 21:32, 26 May 2009 (UTC) Jgharston (talk) 02:04, 6 November 2020 (CET)