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-rw-r--r--src/devices/machine/ds2404.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/devices/machine/ds2404.cpp b/src/devices/machine/ds2404.cpp
index 27b179b149d..0b62e2dbbcf 100644
--- a/src/devices/machine/ds2404.cpp
+++ b/src/devices/machine/ds2404.cpp
@@ -6,6 +6,11 @@
RTC + BACKUP RAM
+ FIXME: This device implements a parallel interface provided by the
+ Seibu SEI600 for the convenience of SPI emulation. It does not
+ implement the 1-Wire protocol actually used with that ASIC, nor
+ does it implement the alternate 3-Wire serial interface.
+
**********************************************************************/
#include "emu.h"