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cpm3help/romwbw/06tune.help

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2020-03-18 13:10:01 +01:00
///1TUNE
Syntax:
TUNE <filename>
Explanation:
TUNE plays PT2/PT3/MYM sound files.
<filename> of sound file to load and play
Filename extension determines file type
(.PT2, .PT3, or .MYM)
Notes:
- Supports AY-3-8910, YM2149, etc.
- Max Z80 CPU clock is about 8 MHz or sound chip will not
handle speed.
- Higher CPU clock speeds are possible on Z180 because extra
I/O wait states are added during I/O to sound chip.
- Uses hardware timer support on systems that support a timer.
Otherwise, a delay loop calibrated to CPU speed is used.
- Delay loop is calibrated to CPU speed, but it does not com-
pensate for time variations in each quark loop resulting
from data decompression.
An average quark processing time is assumed in each loop.
- Most sound files originally targeted MSX or ZX Spectrum
which used 1.7897725 MHz and 1.773400 MHz respectively for
the PSG clock. For best sound playback, PSG should be run at
approx. this clock rate.
Author:
Wayne Warthen (wwarthen@gmail.com)