OSBYTE &17

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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)

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OSBYTE