Z80 interrupts: Difference between revisions
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=IRQ= | =IRQ= | ||
{{Chipname|Z80}} IRQs can be generated by the {{Chipname|YM2610}}, and are mostly used to time music playback. | {{Chipname|Z80}} IRQs can be generated by the {{Chipname|YM2610}}'s [[YM2610 timers|timers]], and are mostly used to time music playback. | ||
The vector address is '''$0038'''. | The vector address is '''$0038'''. | ||
They can be disabled in software (DI/EI). | They can be disabled in software (DI/EI) and must be acknowledged via the YM2610. | ||
=NMI= | =NMI= | ||
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The vector address is '''$0066'''. | The vector address is '''$0066'''. | ||
They can | They can be enabled or disabled through [[Z80 port map|ports $08 and $18]]. They are disabled after a [[reset]]. | ||
They are acknowledged by reading [[Z80 port map|port $00]]. | |||
[[Category:Audio system]] | [[Category:Audio system]] | ||
Latest revision as of 21:07, 18 February 2017
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.