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-rw-r--r--src/mame/miltonbradley/grandmaster.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/miltonbradley/grandmaster.cpp b/src/mame/miltonbradley/grandmaster.cpp
index 984dbba3b63..0d2c0c269d0 100644
--- a/src/mame/miltonbradley/grandmaster.cpp
+++ b/src/mame/miltonbradley/grandmaster.cpp
@@ -127,7 +127,7 @@ u8 grandmas_state::irq_clear_r(offs_t offset)
u8 grandmas_state::status_r()
{
// d0: magnet sensor
- u8 data = m_board->magnet_r();
+ u8 data = m_board->magnet_r() ^ 1;
// d1,d3,d5: IRQ F/F Q
for (int i = 0; i < 3; i++)