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-rw-r--r--src/devices/machine/msm6253.cpp4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/devices/machine/msm6253.cpp b/src/devices/machine/msm6253.cpp
index 450b178f701..025e7d0d2d6 100644
--- a/src/devices/machine/msm6253.cpp
+++ b/src/devices/machine/msm6253.cpp
@@ -116,7 +116,7 @@ bool msm6253_device::shift_out()
READ8_MEMBER(msm6253_device::d0_r)
{
// offset is ignored
- return shift_out();
+ return shift_out() | (space.unmap() & 0xfe);
}
//-------------------------------------------------
@@ -126,5 +126,5 @@ READ8_MEMBER(msm6253_device::d0_r)
READ8_MEMBER(msm6253_device::d7_r)
{
// offset is ignored
- return shift_out() << 7;
+ return (shift_out() << 7) | (space.unmap() & 0x7f);
}