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-rw-r--r--src/mame/drivers/segas32.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mame/drivers/segas32.cpp b/src/mame/drivers/segas32.cpp
index 51df06e9007..8fbbf85b77a 100644
--- a/src/mame/drivers/segas32.cpp
+++ b/src/mame/drivers/segas32.cpp
@@ -2373,6 +2373,8 @@ MACHINE_CONFIG_MEMBER(segas32_trackball_state::device_add_mconfig)
MCFG_DEVICE_ADD("upd3", UPD4701A, 0)
MCFG_UPD4701_PORTX("TRACKX3")
MCFG_UPD4701_PORTY("TRACKY3")
+
+ // 837-8685 I/O board has an unpopulated space for a fourth UPD4701A
MACHINE_CONFIG_END
DEFINE_DEVICE_TYPE(SEGA_S32_TRACKBALL_DEVICE, segas32_trackball_state, "segas32_pcb_trackball", "Sega System 32 trackball PCB")