Difference between revisions of "83Plus:BCALLs:4FF9"
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=== Inputs === | === Inputs === | ||
The block for the Trace Hook must be set up correctly. | The block for the Trace Hook must be set up correctly. | ||
| − | |||
=== Outputs === | === Outputs === | ||
| − | *HL points to the start of the hook. | + | *HL points to the start of the hook. |
| − | *F is 6A if the hook was not run. | + | *F is 6A if the hook was not run. |
| + | |||
| + | === Destroys === | ||
| + | *A | ||
== Comments == | == Comments == | ||
| − | This BCALL is known to be present in | + | This BCALL is known to be present in OS 1.13, and is undocumented. |
== Credits and Contributions == | == Credits and Contributions == | ||
*Michael Cimino | *Michael Cimino | ||
Latest revision as of 12:25, 6 February 2008
Synopsis
Unofficial Name: RunTracerHook
BCALL Address: 4FF9
Checks the first byte of the block for the Trace Hook. If the byte is 83, the hook is run. Otherwise, the active flag for the hook is set to zero.
Inputs
The block for the Trace Hook must be set up correctly.
Outputs
- HL points to the start of the hook.
- F is 6A if the hook was not run.
Destroys
- A
Comments
This BCALL is known to be present in OS 1.13, and is undocumented.
Credits and Contributions
- Michael Cimino
