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27 lines
1.5 KiB
Markdown
27 lines
1.5 KiB
Markdown
# Sharp SM8521
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the SM8521 is the CPU and sound chip of the Game.com, a handheld console released in 1997 as a competitor to the infamous Nintendo Virtual Boy.
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sadly, the Game.com ended up being a failure as well, mostly due to poor quality games. the Game.com only lasted 3 years before being discontinued.
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however, for its time, it was a pretty competitively priced system. the Game Boy Color was to be released in a year for $79.95, while the Game.com was released for $69.99; its later model, the Pocket Pro, was released in mid-1999 for $29.99 due to the Game.com's apparent significant decrease in value.
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in fact, most games never used the wavetable/noise mode of the chip. Sonic Jam, for example, uses a sine wave with a software-controlled volume envelope on the DAC channel (see below for more information on the DAC channel).
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the sound-related features and quirks of the SM8521 are as follows:
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- 2 4-bit wavetable channels
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- a noise channel (which can go up to a very high pitch, creating an almost periodic noise sound)
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- 5-bit volume
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- a low bit-depth output (which means it distorts a lot).
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- it phase resets when you switch waves
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- 12-bit pitch with a wide frequency range
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- a software-controlled D/A register that (potentially) requires all other registers to be stopped to play. due to this, it is currently not implemented in Furnace.
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## effects
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- `10xx`: **set waveform.**
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- `xx` is a value between 0 and 255 that sets the waveform of the channel you place it on.
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## info
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this chip uses the [SM8521](../4-instrument/sm8521.md) instrument editor.
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