From f21219d83d533ca2c87e452050ae26f39d944d98 Mon Sep 17 00:00:00 2001 From: ClawGrip Date: Sat, 15 Jun 2019 14:00:06 +0200 Subject: o2.cpp: Add notes about the O2 Keyboard MCU (Zilog "RT101+228A") [Sean Riddle] Some info discovered after decapping the Zilog MCU from the default Sgi Keyboard for the O2 --- src/mame/drivers/o2.cpp | 5 +++++ 1 file changed, 5 insertions(+) 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. **********************************************************************/ -- cgit v1.2.3