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-rw-r--r--src/devices/cpu/z8/z8.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/devices/cpu/z8/z8.cpp b/src/devices/cpu/z8/z8.cpp
index aae001c893a..5d291b465f1 100644
--- a/src/devices/cpu/z8/z8.cpp
+++ b/src/devices/cpu/z8/z8.cpp
@@ -138,6 +138,7 @@ void z8_device::preprogrammed_map(address_map &map)
void z8_device::register_map(address_map &map)
{
+ map.unmap_value_high();
map(0x00, 0x00).rw(FUNC(z8_device::p0_read), FUNC(z8_device::p0_write));
map(0x01, 0x01).rw(FUNC(z8_device::p1_read), FUNC(z8_device::p1_write));
map(0x02, 0x02).rw(FUNC(z8_device::p2_read), FUNC(z8_device::p2_write));