Topic       : TOS - The Operating System
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Version     : tos.hyp (December 19, 2008)
Subject     : Programmieren/Atari
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Index Size  : 93790
HCP-Version : 5
Compiled on : Atari
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View Ref-File4.14.7  Oscanvb                                                    TOS

 Name:         »Oscanvb« - witch the VB edge-test routine, as well as 
               some tests in the IKBD interrupt.

 Opcode:       4204

 Syntax:       int16_t Oscanvb( int16_t mode );

 Description:  The function permits switching off the VB edge-test 
               routine as well as the test for Shift/Shift/Clear in 
               the IKBD interrupt. The following apply:

                Parameter  Meaning

                mode

                            -1  =  Obtain status 
                             0  =  Switch tests off 
                             1  =  Switch tests on (default) 

               Though the tests require only some 1-2% CPU time, for 
               time-critical animations and MIDI routines this could 
               be just too much.

               Important: Before termination of the program it is 
               imperative that the tests are switched on again.

 Return value: The function returns the current setting in each case.

 Availability: These functions are only available under OverScan; they 
               are not routines of the operating system.

 Group:        OverScan XBIOS functions

 See also:     Binding   Oscanis   Oscanpatch   Oscanphy   Oscanscr 
               Oscanswitch   Oscantab