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Electric Keet 2025-09-27 22:26:38 -07:00 • committed by tildearrow
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doc/7-systems/msm6295.md
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this chip is an upgrade from the MSM6258 in that it provides 4 ADPCM channels at a fixed output rate up to 32 KHz depending on clock rate. between the late '80s and late '90s, it was one of the most common, if not _the_ most common soundchip used in arcade machines: Capcom, Toaplan, Kaneko, Atari, Tecmo, the list can go on and on...
without bankswitching, the chip supports 256kB of sample RAM and can hold up to 127 samples at once. Each sample can be up to 63KB.
without bankswitching, the chip supports 256kB of sample RAM and can hold up to 127 samples at once.
## effects
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this chip uses the [MSM6295](../4-instrument/msm6295.md) instrument editor.
when not bankswitched, maximum sample length is 522240 samples.
## chip clock rates
like MSM6258, MSM6295 is an extremely basic ADPCM sound codec. it has no variable sample rate; it depends on clock rate of the chip itself. the clock can be divided by either 132 or by 165 to get the sample rates listed below:

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doc/7-systems/ym2610.md
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@ -114,9 +114,9 @@ this chip uses the [FM (OPN)](../4-instrument/fm-opn.md), [AY-3-8910/SSG](../4-i
sample lengths are padded to multiples of 512 samples.
ADPCM-A samples cannot loop, and have a fixed sample rate of the chip's clock divided by 432.
ADPCM-A samples have a maximum length of 2097152 samples, cannot loop, and have a fixed sample rate of the chip's clock divided by 432.
ADPCM-B samples have a maximum length of 2097152 samples, and loop points are ignored; they may only loop over the entire sample. these have a maximum sample rate of the chip's clock speed divided by 144.
ADPCM-B sample loop points are ignored; they may only loop over the entire sample. these have a maximum sample rate of the chip's clock speed divided by 144.
## extended channel 2