Difference between revisions of "83Plus:Hooks:9BB0"

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'''Note:''' Do not take the information on this template page as actual documentation!
 
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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]].
 
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== Synopsis ==
 
== Synopsis ==
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'''Name:''' ImAHook
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'''Name:''' App Change Hook
  
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'''Hook Pointer Block Address:''' [[83Plus:RAM:8562|8562]]
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'''Hook Pointer Block Address:''' [[83Plus:RAM:9BB0|9BB0]]
  
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'''Hook Enable BCALL:''' [[83Plus:BCALLs:1234|1234]]
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'''Hook Enable BCALL:''' [[83Plus:BCALLs:502C|502C]]
  
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'''Hook Disable BCALL:''' [[83Plus:BCALLs:5678|5678]]
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'''Hook Disable BCALL:''' [[83Plus:BCALLs:502F|502F]]
  
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'''Hook Call BCALL:''' [[83Plus:BCALLs:9012|9012]]
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'''Hook Call BCALL:''' ''(none known)''
  
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'''Hook Active Flag:''' 6, (iy + 23h)
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'''Hook Active Flag:''' [[83Plus:Flags:36#Bit_2|2, (iy + 36h)]]
  
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This hook allows you to change the values that [[83Plus:BCALLs:4972|GetKey]] returns.
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This hook is called at any time that TIOS changes from one app to another.  Also called when the calculator is turned off.
  
 
== Using the Hook ==
 
== Using the Hook ==
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These different values, passed in a, determines what the hook should do.
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* 1: The calculator just turned on. There seem to be no other values passed to the hook.
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* B = current app
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* 2: The calculator is computing 1+1.
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** Switching from one app to another: A = new app
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** b: 1
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** Turning the calculator off from most apps: A = 2
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** c: 1
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** Exiting an external app: A = 0
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** Change b and/or c to affect the output of the problem (which will still look like 1+1 to the user).
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** Turning the calculator off from the graph screen (possibly others): A = 0
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* 3: Preparing to turn off due to 2nd+OFF.
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** Zero flag: Clear to abort the power off.
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== Comments ==
 
== Comments ==
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This hook doesn't exist. This is a demonstration only.
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TIOS completely ignores the output of this hook.
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== Credits and Contributions ==
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* '''/dev/hda1:''' My favorite hard drive partition.
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Revision as of 00:03, 28 March 2005

Synopsis

Name: App Change Hook

Hook Pointer Block Address: 9BB0

Hook Enable BCALL: 502C

Hook Disable BCALL: 502F

Hook Call BCALL: (none known)

Hook Active Flag: 2, (iy + 36h)

This hook is called at any time that TIOS changes from one app to another. Also called when the calculator is turned off.

Using the Hook

  • B = current app
    • Switching from one app to another: A = new app
    • Turning the calculator off from most apps: A = 2
    • Exiting an external app: A = 0
    • Turning the calculator off from the graph screen (possibly others): A = 0

Comments

TIOS completely ignores the output of this hook.

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