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35 lines
1.2 KiB
Markdown
35 lines
1.2 KiB
Markdown
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# Nuked-OPN2
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High accuracy Yamaha YM3438(OPN2) emulator.
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The YM3438 is a CMOS variant of the YM2612 used in Sega MegaDrive(Genesis) and FM Towns.
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Genesis Plus GX fork with this core integrated is available here: https://github.com/nukeykt/Genesis-Plus-GX
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# Features:
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- Based on YM3438 die shot reverse engineering and thus provides very high emulation accuracy.
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- Cycle-accurate.
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- Undocumented registers/features emulation.
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- SSG-EG, CSM mode emulation.
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- Compatible with the YM2612.
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# API documention
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```
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void OPN2_Reset(ym3438_t *chip) - Reset emulated chip
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void OPN2_Clock(ym3438_t *chip, Bit32s *buffer) - Advances emulated chip state by 1 internal clock(6 master clocks). Writes signed 9-bit MOL, MOR pin states to buffer.
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void OPN2_Write(ym3438_t *chip, Bit32u port, Bit8u data) - Write 8-bit data to port.
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void OPN2_SetTestPin(ym3438_t *chip, Bit32u value) - Set TEST pin value.
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Bit32u OPN2_ReadTestPin(ym3438_t *chip) - Read TEST pin value.
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Bit32u OPN2_ReadIRQPin(ym3438_t *chip) - Read IRQ pin value.
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Bit8u OPN2_Read(ym3438_t *chip, Bit32u port) - Read chip status.
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```
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# Samples
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Sonic the Hedgehog:
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https://youtu.be/ImmKy_-pJ8g
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Sega CD BIOS v1.10:
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https://youtu.be/s-8ASMbtojQ
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