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