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namco/namcos2.cpp: MCU note

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AJR 2024-12-01 14:28:12 -05:00
parent a8e1ad4bf4
commit 9f705b3e1c
1 changed files with 7 additions and 1 deletions
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src/mame/namco/namcos2.cpp
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@ -110,6 +110,13 @@ which contains:
This stream is then combined with the stream from the text plane pixel
generator with the highest priority pixel being displayed on screen.
There were two different System II CPU PCBs. 8618961200 uses the C65 I/O MCU
(Hitachi 63705). 8618961803 (the last digit may vary) uses the C68 I/O MCU
(Mitsubishi 37450). Each MCU has a socket for an external EPROM, though the
C68 EPROM is normally unpopulated except on transitional PCBs which used a
stock MCU presumably running in ROMless mode. Some games have been seen with
either MCU type.
Graphics Board details
======================
@ -547,7 +554,6 @@ C102 - Controls CPU access to ROZ Memory Area.
#include "namcos2.h"
#include "cpu/m68000/m68000.h"
#include "cpu/m6805/m6805.h"
#include "cpu/m6809/m6809.h"
#include "machine/nvram.h"
#include "sound/ymopm.h"