83Plus:BCALLs:4FF0

Synopsis

Unofficial Name: RunGraphingHook

BCALL Address: 4FF0

Checks the first byte of the block for the Graph 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 Graph 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

• Depends on hook, might destroy everything.

Comments

This BCALL is known to be present in OS 1.13, and is undocumented.

Credits and Contributions

• Michael Cimino (probably)