Seta X1-010
 X1-010
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| Manufacturer(s) | Seta, Allumer |
| Designer(s) | Allumer |
| Release Date(s) | 1988 |
| Type(s) | 8-bit PCM, wavetable |
| Amount of channels | 2 (stereo) |
| Amount of voices | 16 |
| VGM support | since 1.71 |
The X1-010 is a stereo 16-voice PCM/wavetable synthesis chip manufactured by Seta and Allumer. It is supported by the VGM specification since version 1.71.
It was first used in Seta's Twin Eagle: Revenge Joe's Brother from 1988, and last used in Sammy's Trophy Hunting - Bear & Moose from 2002.
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Details
This chip can play 128-sample signed 8-bit waveforms from RAM, or 8-bit signed PCM samples from up to 1MB of external ROM. While this chip is capable of stereo output, no games support stereo output. An individual byte is outputted every 512 clock cycles, resulting in a sample rate of 31.25 KHz if clocked at 16 MHz.
The chip is always paired with an 8kb RAM which contains the chip registers, volume envelopes and wavetables. This RAM is often shared with an external sound CPU, if present. Caution needs to be taken when stripping sound CPU writes to RAM from VGM logs.
Limitations of this chip includes a 4-bit volume register (including envelopes), 8-bit PCM sample frequency register, and 8-bit PCM sample start/loop/end registers (samples need to be aligned to every 4096 bytes).