OSBYTE &8F

OSBYTE &8F (143) - Issue SWR Service Request (on exit Y=response to request if appropriate)

   X=request number
   Y=parameter to pass (varies depending on the request number)

Specification

6502	On entry:	On exit:
A	=&8F	preserved
X	Service request code	=0 service call claimed <>0 service call not claimed
Y	Parameter to service call	Result from service call

Note

Certain service calls such as &01 and &02 return a result in Y without claiming the call.
Other unclaimed calls preserve Y, provided that all paged ROMs behave correctly.

See Also

• Service calls
• http://mdfs.net/Docs/Comp/BBC/Osbyte80

Jgharston 21:26, 26 May 2009 (UTC)