"Jurassic Boy 2" appears to be broken
AllenK @ 2019-05-04 09:55:22
There are a number of problems with the current rom listed in no-inro, yet Jurassic Boy 2 (E) [C][!].gbc (crc32=44827E74) does work perfectly so I figured this would be something worth looking into.
Tauwasser @ 2019-05-05 06:43:38
thanks for your message.
The ROM you mention (crc32=44827E74) is a known bad dump:
a) it's an overdump b) it doesn't dump the ROM correctly/completely due Sachen's custom memory mapping chip.
The ROM currently listed by No-Intro (https://datomatic.no-intro.org/?page=show_record&s=47&n=1409) works fine in MAME where the mapper is correctly implemented.
Tauwasser @ 2019-05-05 06:51:05
Should have mentioned:
The bad dump you're referring to is listed on
Actually, there is at least one more variant of Jurassic Boy that is not in DoM yet. I was going to analyze the ROMs and check for differences first.