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Diffstat (limited to 'src/devices/machine/chessmachine.cpp')
-rw-r--r--src/devices/machine/chessmachine.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/devices/machine/chessmachine.cpp b/src/devices/machine/chessmachine.cpp
index d5f6673fbad..7dd6999f9ad 100644
--- a/src/devices/machine/chessmachine.cpp
+++ b/src/devices/machine/chessmachine.cpp
@@ -131,7 +131,7 @@ void chessmachine_device::main_map(address_map &map)
{
map(0x00000000, 0x000fffff).ram().share("ram");
map(0x00000000, 0x0000007f).r(FUNC(chessmachine_device::bootstrap_r));
- map(0x00400000, 0x00400000).mirror(0x003ffffc).rw(FUNC(chessmachine_device::internal_r), FUNC(chessmachine_device::internal_w));
+ map(0x00400000, 0x007fffff).rw(FUNC(chessmachine_device::internal_r), FUNC(chessmachine_device::internal_w)).umask32(0x000000ff);
map(0x01800000, 0x01800003).r(FUNC(chessmachine_device::disable_bootstrap_r));
}