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-rw-r--r--src/mame/drivers/o2.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/mame/drivers/o2.cpp b/src/mame/drivers/o2.cpp
index dacb0a43e33..37c457f50a0 100644
--- a/src/mame/drivers/o2.cpp
+++ b/src/mame/drivers/o2.cpp
@@ -12,6 +12,11 @@
1f000000 - 1f3fffff MACE
1fc00000 - 1fc7ffff Boot ROM
40000000 - 7fffffff RAM
+
+NOTE: The default Sgi O2 Keyboard (Model No. RT6856T, Part No. 121472-101-B,
+ Sgi No. 062-0002-001) has a Zilog "RT101+228A" MCU, which is really a
+ Zilog Z8615 (a Z8-based PC keyboard controller) with 4K ROM (undumped).
+ It might have a custom ROM, since it had special marking.
**********************************************************************/