diff options
-rw-r--r-- | src/mame/drivers/superqix.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/src/mame/drivers/superqix.cpp b/src/mame/drivers/superqix.cpp index 7fd622917a5..2577334ce22 100644 --- a/src/mame/drivers/superqix.cpp +++ b/src/mame/drivers/superqix.cpp @@ -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 |