Z80 interrupts

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IRQ

Z80 IRQs can be generated by the YM2610's timers, and are mostly used to time music playback.

The vector address is $0038.

They can be disabled in software (DI/EI) and must be acknowledged.

NMI

Non Maskable Interrupts are triggered when the 68k sends a sound command.

The vector address is $0066.

They can only be disabled through ports $08 and $18.

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