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Lord-Nightmare 2016-12-27 21:05:12 -05:00
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commit 7b5ad970d2
1 changed files with 5 additions and 4 deletions
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9
src/mame/drivers/superqix.cpp
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@ -25,10 +25,11 @@ Super Qix:
- The sq07.ic108 ROM came from a bootleg where the 8751 MCU was replaced by an
8031 MCU plus an external ROM (i.e. the sqixb1 romset). The 8031 ROM was bad
(bit 3 was stuck high). It was originally recovered by carefully checking
the disassembly, and this repair was later verified from another dump to be
correct. The majority of the bootleg 8031 MCU code matches the decapped
sqixu b03__03.l2 mcu code, implying the sq07.ic108 8031 MCU code ROM was
derived from code dumped from an original Taito b03__03.l2 8751 MCU somehow.
the disassembly, and this repair was later verified from another dump of an
intact chip to be correct. The majority of the bootleg 8031 MCU code matches
the deprotected sqix b03__03.l2 MCU code, implying the sq07.ic108 8031 MCU
code ROM was derived from code dumped from an original Taito b03__03.l2 8751
MCU somehow.
The bootleg MCU code is different from the original b03__03.l2 MCU since
an 8031 when running in external ROM mode cannot use ports 0 or 2, hence
the code was extensively patched by the bootleggers to avoid use of those