furnace/doc/7-systems/segapcm.md

# 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, the channel count can be corrected by opening the chip config window and clicking the "click here to fix it." button beneath "irregular channel count detected!"

## 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](../4-instrument/segapcm.md) instrument editor.

maximum sample length is 65280 samples.
system doc work 2022-03-22 00:58:07 -05:00			`# SegaPCM`

			`16 channels of PCM? no way!`

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

update Bubble System and SegaPCM docs 2022-05-13 03:18:29 -05:00			`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.`
system doc work 2022-03-22 00:58:07 -05:00
only one header per doc file 2023-09-10 19:34:13 -05:00			`## 5-channel SegaPCM`
update several things - including an Amiga fix 2022-10-15 22:41:50 -05:00
General documentation work. Bug fixes and improvements! (Heh.) 2025-12-26 15:14:32 -08:00			`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, the channel count can be corrected by opening the chip config window and clicking the "click here to fix it." button beneath "irregular channel count detected!"`
update several things - including an Amiga fix 2022-10-15 22:41:50 -05:00
only one header per doc file 2023-09-10 19:34:13 -05:00			`## effects`
lots of doc updates 2022-10-16 00:53:05 -05:00
Lots of little cleanup. Trying for more consistency and clarity, especially for quick reference. 2023-06-25 00:05:30 -07:00			- `20xx`: set PCM frequency.
system doc work 2022-03-22 00:58:07 -05:00			- `xx` is a 256th fraction of 31250Hz.
Lots of little cleanup. Trying for more consistency and clarity, especially for quick reference. 2023-06-25 00:05:30 -07:00			`- this effect exists mostly for DefleMask compatibility; it is otherwise recommended to use Sample type instruments.`
Documentation stuff! New page for the effect list, updates to chanOsc, and links to instrument types from every "system" page. 2023-08-04 09:11:53 -07:00
only one header per doc file 2023-09-10 19:34:13 -05:00			`## info`
Documentation stuff! New page for the effect list, updates to chanOsc, and links to instrument types from every "system" page. 2023-08-04 09:11:53 -07:00
don't mention Generic Sample ins type on sample ch ips that have their own ins types 2023-09-10 23:57:46 -05:00			`this chip uses the [SegaPCM](../4-instrument/segapcm.md) instrument editor.`
Many doc updates. Settings changes, interface niceties, and a ton of info about sample limits. 2025-09-27 17:17:07 -07:00
			`maximum sample length is 65280 samples.`