mb88xx: revert irq change too (bosco shot sound broken)

mamedev · Jun 26, 2023 · 27d36f1 · 27d36f1
1 parent 2568139
commit 27d36f1
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/devices/cpu/mb88xx/mb88xx.cpp b/src/devices/cpu/mb88xx/mb88xx.cpp
@@ -429,6 +429,9 @@ void mb88_cpu_device::update_pio( int cycles )
 		{
 			/* if we have a live external source, call the irqcallback */
 			standard_irq_callback( 0, intpc );
+			/* The datasheet doesn't mention if the interrupt flag
+			 * is cleared, but it seems to be only for this case. */
+			m_pio &= ~INT_CAUSE_EXTERNAL;
 			m_PC = 0x02;
 		}
 		else if (m_pending_interrupt & m_pio & INT_CAUSE_TIMER)