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o2.cpp: Add notes about the O2 Keyboard MCU (Zilog "RT101+228A") [Sean Riddle]

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Some info discovered after decapping the Zilog MCU from the default Sgi Keyboard for the O2
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ClawGrip 2019-06-15 14:00:06 +02:00 committed by GitHub
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src/mame/drivers/o2.cpp
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@ -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.
**********************************************************************/