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-rw-r--r--src/mame/drivers/mod8.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/drivers/mod8.cpp b/src/mame/drivers/mod8.cpp
index 3ee57a70668..6ce16207aab 100644
--- a/src/mame/drivers/mod8.cpp
+++ b/src/mame/drivers/mod8.cpp
@@ -122,6 +122,7 @@ void mod8_state::mem_map(address_map &map)
void mod8_state::io_map(address_map &map)
{
map.unmap_value_high();
+ map.global_mask(0x1f);
map(0x00, 0x00).r(FUNC(mod8_state::tty_r));
map(0x0a, 0x0a).w(FUNC(mod8_state::out_w));
map(0x0b, 0x0b).w(FUNC(mod8_state::tty_w));