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-rw-r--r--src/devices/machine/am9517a.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/devices/machine/am9517a.cpp b/src/devices/machine/am9517a.cpp
index 4e99e678f20..8901b7a910d 100644
--- a/src/devices/machine/am9517a.cpp
+++ b/src/devices/machine/am9517a.cpp
@@ -916,6 +916,9 @@ void am9517a_device::write(offs_t offset, uint8_t data)
m_mask = data & 0x0f;
LOG("AM9517A Mask Register: %01x\n", m_mask);
+
+ // tek4132 firmware indicates setting mask bits also sets status
+ m_status |= (data & 0x0f) << 4;
break;
}
}