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-rw-r--r--src/devices/bus/st/stcart.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/devices/bus/st/stcart.cpp b/src/devices/bus/st/stcart.cpp
index 1847f4e66cd..cdd8ef02ab8 100644
--- a/src/devices/bus/st/stcart.cpp
+++ b/src/devices/bus/st/stcart.cpp
@@ -1,6 +1,10 @@
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
+// A peculiarity of the ST cartridge port is that it's readonly. So
+// writing (i.e. ROM banking or replay DAC) is done by reading
+// at an appropriate address (strobe).
+
#include "emu.h"
#include "stcart.h"