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-rw-r--r--src/devices/cpu/tx0/tx0.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/devices/cpu/tx0/tx0.cpp b/src/devices/cpu/tx0/tx0.cpp
index 34c4956bd2e..3f9bdcf2087 100644
--- a/src/devices/cpu/tx0/tx0.cpp
+++ b/src/devices/cpu/tx0/tx0.cpp
@@ -783,6 +783,7 @@ void tx0_8kw_device::execute_instruction_8kw()
/* (5 is undefined) */
int index = (MAR & 0007000) >> 9;
+ m_ios = 0;
call_io_handler(index);
m_ioh = 1;
}