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-rw-r--r--src/mame/video/decodmd1.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/video/decodmd1.cpp b/src/mame/video/decodmd1.cpp
index ed58f706334..ab5f133b1ef 100644
--- a/src/mame/video/decodmd1.cpp
+++ b/src/mame/video/decodmd1.cpp
@@ -125,7 +125,7 @@ WRITE_LINE_MEMBER(decodmd_type1_device::rowdata_w)
WRITE_LINE_MEMBER(decodmd_type1_device::rowclock_w)
{
- if (!state & m_rowclock) // on negative edge
+ if (~state & m_rowclock) // on negative edge
m_rowselect = (m_rowselect << 1) | m_rowdata;
m_rowclock = state;
}