From c0f26565e2fc55f319b30543e7b039131015e4a3 Mon Sep 17 00:00:00 2001
From: Olivier Galibert <galibert@pobox.com>
Date: Mon, 30 Jan 2023 08:54:26 +0100
Subject: [PATCH] m68000: Properly acknowledge interrupts when no mixer is
 present

---
 src/devices/cpu/m68000/m68000.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/devices/cpu/m68000/m68000.cpp b/src/devices/cpu/m68000/m68000.cpp
index 27d7892144e..9043184e303 100644
--- a/src/devices/cpu/m68000/m68000.cpp
+++ b/src/devices/cpu/m68000/m68000.cpp
@@ -419,7 +419,13 @@ void m68000_device::start_interrupt_vector_lookup()
 	// flag for berr -> spurious
 
 	int level = m_next_state >> 24;
-	standard_irq_callback(level);
+	if(m_interrupt_mixer)
+		standard_irq_callback(level);
+	else {
+		for(int i=0; i<3; i++)
+			if(level & (1<<i))
+				standard_irq_callback(i);
+	}
 
 	// Clear the nmi flag
 	if(level == 7) {