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-rw-r--r--src/mame/drivers/k1003.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/drivers/k1003.cpp b/src/mame/drivers/k1003.cpp
index 5c2229efde2..7c7cd729421 100644
--- a/src/mame/drivers/k1003.cpp
+++ b/src/mame/drivers/k1003.cpp
@@ -129,6 +129,7 @@ void k1003_state::seg_w(uint8_t data)
void k1003_state::io_map(address_map &map)
{
map.unmap_value_high();
+ map.global_mask(0x1f);
map(0x00, 0x00).r(FUNC(k1003_state::key_r));
map(0x02, 0x02).r(FUNC(k1003_state::port2_r));