From 9b286b3090136ada75b6956cab4c1b150894ce3d Mon Sep 17 00:00:00 2001
From: Vas Crabb <vas@vastheman.com>
Date: Sat, 25 Nov 2023 15:38:57 +1100
Subject: galaxian/galaxian.cpp: Boost scheduler interleaving during
 communication with speech CPU for sbhoei.

---
 src/mame/galaxian/galaxian.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mame/galaxian/galaxian.cpp b/src/mame/galaxian/galaxian.cpp
index aa4a95da8c7..fb91e88533e 100644
--- a/src/mame/galaxian/galaxian.cpp
+++ b/src/mame/galaxian/galaxian.cpp
@@ -1639,6 +1639,7 @@ void sbhoei_state::sbhoei_soundlatch_w(uint8_t data)
 {
 	m_soundlatch->write(data & 0x7f);
 	m_8039->set_input_line(0, (data & 0x80) ? ASSERT_LINE : CLEAR_LINE);
+	machine().scheduler().perfect_quantum(attotime::from_usec(50)); // main CPU polls for response from 8039
 }
 
 void sbhoei_state::p2_w(uint8_t data)
-- 
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