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DtPtchHelp
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1994-07-11
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DataPatch Help File.
====================
This module sits in the background and quietly corrects the OS when it
screws up on sound pitching. Because it is using an OS legal call to do this,
Sound_Tuning, then all well behaved voice generators will play correctly.
Thus this module isn't reall a patch just for DataVox, but rather the entire
sound system, and perhaps might be more aptly named 'SoundPatch'.
The patch only activates on machines that are fitted with RISC OS 2.01 or
better and have a VIDC1a fitted. VIDC20 or better hardware doesn't require
this patch as that chip has the sound replay detached from the pixel
generator clock. If the patch is installed on a machine which doesn't need
patching then the patch will remain dormant and have no adverse affect, apart
from consuming a kilobyte or so of RMA.
OSCLI Commands.
===============
*DataPatch_Apply <pixel rate> <correction value>
This command sets a patching value for a certain pixel rate. Four 'slots'
are provided for correction rates - hopefully that will be enough. By default
the first slot is filled for PC style modes of 25175 Hertz. Once patches are
entered they cannot be removed except by killing the module.
The correction value is a number sutiable for passing to the Sound_Tuning
SWI. (Which is basically all this module is doing.) Extra slots are provided
with the intention of allowing people with VIDC enhancer boards to be able to
apply corrections to the sound system, which some boards don't provide in
their on board software.
Version History
=========================================================================
|Version | Comments. |
=========================================================================
| 0.01 | Created the first version of DataPatch. (2/7/1994) |
| 0.02 | Fixed the OSCLI command and adjusted the default pitching |
| | for the 25175 pixel rate modes. (10/7/1994) |
| 0.03 | Corrected the patch to properly account for the weirdness |
| | in the sound system. (11/7/1994) |
=========================================================================