It's probably this change:
- MCFG_DEVICE_ADD("zeus2", ZEUS2, ZEUS2_VIDEO_CLOCK)
- MCFG_ZEUS2_IRQ_CB(WRITELINE(*this, midzeus2_state, zeus_irq))
+ ZEUS2(config, m_zeus, ZEUS2_VIDEO_CLOCK);
+ m_zeus->vblank_callback().set(FUNC(midzeus2_state::zeus_irq));
The irq callback was changed to a vblank_callback, probaby for a copy-paste error.
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Re: Midway Zeus 2 strange slowdown
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