Difference between revisions of "OSBYTE &8F"
(→Specification: added table) |
(presence of result not contingent on claim; preservation of Y relies on ROMs cooperating) |
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| X || align="left" | Service request code || align="left" | =0 service call claimed<br><>0 service call not claimed | | X || align="left" | Service request code || align="left" | =0 service call claimed<br><>0 service call not claimed | ||
|- align="center" valign="top" | |- align="center" valign="top" | ||
| − | | Y || align="left" | Parameter to service call || align="left" | Result from service call | + | | Y || align="left" | Parameter to service call || align="left" | Result from service call |
|} | |} | ||
| + | |||
| + | ;Note | ||
| + | Certain [[service calls]] such as &01 and &02 return a result in Y without claiming the call.<br> | ||
| + | Other unclaimed calls preserve Y, provided that all paged ROMs behave correctly. | ||
==See Also== | ==See Also== | ||
Revision as of 20:56, 11 December 2021
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
Jgharston 21:26, 26 May 2009 (UTC)
