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-rw-r--r--src/devices/machine/z80sio.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/devices/machine/z80sio.cpp b/src/devices/machine/z80sio.cpp
index 83a8479f638..4b9ee65b981 100644
--- a/src/devices/machine/z80sio.cpp
+++ b/src/devices/machine/z80sio.cpp
@@ -1342,7 +1342,7 @@ WRITE_LINE_MEMBER( z80sio_channel::dcd_w )
if (!m_rx_rr0_latch)
{
- if (m_dcd)
+ if (!m_dcd)
m_rr0 |= RR0_DCD;
else
m_rr0 &= ~RR0_DCD;