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-rw-r--r--src/devices/cpu/sm510/sm510.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/devices/cpu/sm510/sm510.cpp b/src/devices/cpu/sm510/sm510.cpp
index 35c141dcde8..fa35d53e0ec 100644
--- a/src/devices/cpu/sm510/sm510.cpp
+++ b/src/devices/cpu/sm510/sm510.cpp
@@ -156,7 +156,7 @@ void sm510_device::execute_one()
} // big switch
// BM high bit is only valid for 1 step
- m_sbm = (m_op == 0x02);
+ m_bmask = (m_op == 0x02) ? 0x40 : 0;
}
bool sm510_device::op_argument()