83Plus:Hooks:9BD4 - Revision history

Dan Englender: Reverted edit of Dan Englender, changed back to last version by 84plusfreak

2005-06-12T05:28:29Z

Reverted edit of Dan Englender, changed back to last version by 84plusfreak

Dan Englender: /* Using the Hook */ Zero flag aborts, not B=0

2005-06-12T05:02:25Z

‎Using the Hook: Zero flag aborts, not B=0

84plusfreak: /* Credits and Contributions */

2005-04-08T14:57:22Z

‎Credits and Contributions

FloppusMaximus at 05:16, 30 March 2005

2005-03-30T05:16:08Z

FloppusMaximus at 17:20, 28 March 2005

2005-03-28T17:20:58Z

FloppusMaximus at 17:13, 28 March 2005

2005-03-28T17:13:19Z

New page

'''Note:''' Do not take the information on this template page as actual documentation!

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.

----

== Synopsis ==
'''Name:''' ImAHook

'''Hook Pointer Block Address:''' [[83Plus:RAM:8562|8562]]

'''Hook Enable BCALL:''' [[83Plus:BCALLs:1234|1234]]

'''Hook Disable BCALL:''' [[83Plus:BCALLs:5678|5678]]

'''Hook Call BCALL:''' [[83Plus:BCALLs:9012|9012]]

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

This hook allows you to change the values that [[83Plus:BCALLs:4972|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.

@@ Line 19: / Line 19: @@
 ** C holds the complement of these bits.
 * B always contains the constant 2Ch.
-* Return Zero flag to abort linking.
+* Return with B=0 to abort linking, similar to the [[83Plus:Hooks:9BD0|silent link hook]].
 == Comments ==

@@ Line 19: / Line 19: @@
 ** C holds the complement of these bits.
 * B always contains the constant 2Ch.
-* Return with B=0 to abort linking, similar to the [[83Plus:Hooks:9BD0|silent link hook]].
+* Return Zero flag to abort linking.
 == Comments ==

← Older revision		Revision as of 14:57, 8 April 2005
Line 25:		Line 25:

	== Credits and Contributions ==		== Credits and Contributions ==
−	* '''84plusfreak''' ~~-- sorry, I don't know your real name --~~ discovered and analyzed this hook.	+	* '''84plusfreak (Sernin van de Krol)''' discovered and analyzed this hook.

@@ Line 1: / Line 1: @@
-[[Category:83Plus:Hooks:By_Name|USB Activity Hook]]
+[[Category:83Plus:Hooks:By_Name|USB Activity Hook]] [[Category:83Plus:Hooks:By_Address|9BD4 - USB Activity Hook]]
 [[Category:83Plus:Hooks:By_Address|9BD4 - USB Activity Hook]]
 == Synopsis ==
 '''Name:''' USB Activity Hook

@@ Line 1: / Line 1: @@
-'''Note:''' Do not take the information on this template page as actual documentation!
+[[Category:83Plus:Hooks:By_Name|USB Activity Hook]]
+[[Category:83Plus:Hooks:By_Address|9BD4 - USB Activity Hook]]
-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.
-−
-----
-−
 == Synopsis ==
-'''Name:''' ImAHook
+'''Name:''' USB Activity Hook
-'''Hook Pointer Block Address:''' [[83Plus:RAM:8562|8562]]
+'''Hook Pointer Block Address:''' [[83Plus:RAM:9BD4|9BD4]]
-'''Hook Enable BCALL:''' [[83Plus:BCALLs:1234|1234]]
+'''Hook Enable BCALL:''' [[83Plus:BCALLs:528A|528A]]
-'''Hook Disable BCALL:''' [[83Plus:BCALLs:5678|5678]]
+'''Hook Disable BCALL:''' [[83Plus:BCALLs:528D|528D]]
-'''Hook Call BCALL:''' [[83Plus:BCALLs:9012|9012]]
+'''Hook Call BCALL:''' ''(none known)''
-'''Hook Active Flag:''' 6, (iy + 23h)
+'''Hook Active Flag:''' [[83Plus:Flags:3A#Bit_0|0, (iy+3Ah)]]
-This hook allows you to change the values that [[83Plus:BCALLs:4972|GetKey]] returns.
+This hook is called from the interrupt routine when USB activity is detected.
 == Using the Hook ==
-These different values, passed in a, determines what the hook should do.
+* The hook is called whenever any of bits 4-0 of [[83Plus:Ports:55|port 55h]] are low.
-* 1: The calculator just turned on. There seem to be no other values passed to the hook.
+** C holds the complement of these bits.
-* 2: The calculator is computing 1+1.
+* B always contains the constant 2Ch.
-** b: 1
+* Return with B=0 to abort linking, similar to the [[83Plus:Hooks:9BD0|silent link hook]].
-** 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.
+This hook was introduced in OS 2.30. Apps should check the OS version before attempting to use this hook.
 == Credits and Contributions ==
-* '''/dev/hda1:''' My favorite hard drive partition.
+* '''84plusfreak''' -- sorry, I don't know your real name -- discovered and analyzed this hook.