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-rw-r--r--src/mame/drivers/mpu5.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mame/drivers/mpu5.cpp b/src/mame/drivers/mpu5.cpp
index 78610b87ad9..eeaff542d81 100644
--- a/src/mame/drivers/mpu5.cpp
+++ b/src/mame/drivers/mpu5.cpp
@@ -133,6 +133,10 @@ Switches Aux-RS232 Aux Port Alpha Vend-Bus
13 - +12
14 - GAP
15 - 0V
+
+MPU5 Horizon and Genesis machines use also a mux PCB for LEDs, lamps and buttons called
+"Barcrest -MUX5E- XP19642 ISS4", wich uses a Zilog Z86E6116PSG MCU (undumped).
+
*/