Title:			VIDCCLOCK
Author:			Owen Smith
Version:		0.04
Title From:		Documentation
Author From:		Documentation
Version From:		Documentation
Supplier:		Owen Smith (osmith@acorn.co.uk)
Date:			01/03/92
Keywords: 		Environment managers; Resource managers; 
          		System monitors
Shareware:		No
Machine:		Archimedes
Operating system:	RISCOS
Memory requirements:	
Peripherals needed:	
Other s/ware needed:	
Directory:		micros/arch/riscos/a/a249
Date mounted/updated:	24/02/93
File names:		a249.arc
Unarchived files:	5
Unarchived size:	14 Kbytes
Omissions:		
See also:		

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Acquiring the package:

Download the uuencoded file and extract using SparkPlug 2 (see the "tools_help"
file in arch/riscos/tools for further info).


Description:

VIDCclock provides integrated software control of AtomWide and compatible
Turbo VIDC hardware when the system concerned is fitted with RISC OS 2.01 or
later. It does this by sitting on Service_ModeChange, reading the
VIDCClockSpeed VDU variable, and switching the VIDC clock to 24 or 36 MHz as
appropriate. This requires that the modes you use are in A540 VIDC list
format so that the kernel knows what the VIDC clock rate should be. Sound
will then play at the correct pitch and speed in 36 MHz modes.

Also included is the source code and documentation describing the new VIDC
list format.