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furnace/doc/7-systems/segapcm.md
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2026-01-15 13:23:23 -05:00

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SegaPCM

16 channels of PCM? no way!

yep, that's right! 16 channels of PCM!

a chip used in the Sega OutRun/X/Y arcade boards. eventually the MultiPCM surpassed it with 28 channels, and later they joined the software mixing gang.

5-channel SegaPCM

Furnace previously had a five channel version of this chip, but it only existed for DefleMask compatibility reasons. when opening older Furnace files and all DefleMask files, you may come across a SegaPCM with 5 channels. to correct this, configure the chip. a button will allow you to set the channel count back to 16.

effects

  • 20xx: set PCM frequency.
    • xx is a 256th fraction of 31250Hz.
    • this effect exists mostly for DefleMask compatibility; it is otherwise recommended to use Sample type instruments.

info

this chip uses the SegaPCM instrument editor.

maximum sample length is 65280 samples.