83Plus:Hooks:9BD4

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The Hooks are named by their hook pointer block address (the four bytes consisting of page, address, and an extra byte), in hexadecimal. An example is 83Plus:Hooks:9B84.

You must also include a variation on the following code to put your documentation into the appropriate Category listing:

NaodW29-nowiki5f2603d84685f5ec00000001

Change the address and name to match your hook.

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Synopsis

Name: ImAHook

Hook Pointer Block Address: 8562

Hook Enable BCALL: 1234

Hook Disable BCALL: 5678

Hook Call BCALL: 9012

Hook Active Flag: 6, (iy + 23h)

This hook allows you to change the values that GetKey returns.

Using the Hook

These different values, passed in a, determines what the hook should do.

• 1: The calculator just turned on. There seem to be no other values passed to the hook.
• 2: The calculator is computing 1+1.
  • b: 1
  • c: 1
  • Change b and/or c to affect the output of the problem (which will still look like 1+1 to the user).
• 3: Preparing to turn off due to 2nd+OFF.
  • Zero flag: Clear to abort the power off.

Comments

This hook doesn't exist. This is a demonstration only.

Credits and Contributions

• /dev/hda1: My favorite hard drive partition.