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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