OKI MSM6295

an upgrade from 6258 - it provides 4 ADPCM channels, at max 32 KHz (still no variable pitch though). between 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.

effects

20xx: set chip output rate.
- 0: /132
- 1: /165

info

this chip uses the MSM6295 instrument editor.

chip clock rates

like MSM6258, MSM6295 is an extremely basic ADPCM sound codec. it has no variable frequency rate, it depends on clock rate of a chip itself. Furnace supports following rates:

clock rate	sampling rate
1 MHz	7576 Hz
1.02 MHz	7727 Hz
1.056 MHz	8000 Hz
1.193 MHz	9038 Hz
0.89 MHz	6742 Hz
0.875 MHz	6629 Hz
0.9375 MHz	7102 Hz
1.5 MHz	11364 Hz
1.79 MHz	13561 Hz
2 MHz	15152Hz
2.112 MHz	16000 Hz
3 MHz	22728 Hz
3.58 MHz	27122 Hz
4 MHz	30304 Hz
4.224 MHz	32000 Hz

chip clock divisor

MSM6295 clock rate could be divided by 132 (resulting sample rates above), or by 165. to get a clock rate using divisor of 165, formula is clock rate (in Hz) / 165. example: 1 MHz MSM6295 in 165 divisor mode results in output rate of 6060 Hz.

chip config

the following options are available in the Chip Manager window:

Clock rate: sets the rate at which the chip will run.
Output rate: sets the chip clock divider.
Bankswitched: add an NMK112 chip to increase sample memory.

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