83Plus:BCALLs:4FF9

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