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 via the YM2610.
NMI
Non Maskable Interrupts are triggered when the 68k sends a sound command.
The vector address is $0066.
They can be enabled or disabled through ports $08 and $18. They are disabled after a reset.
They are acknowledged by reading port $00.