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name the game (early 80s, spcinvaders hardware)
#242467 - 01/02/11 07:05 PM
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This ROMset has been floating around as "mr_unknown.zip", and later labeled as "unknown Model Racing game" (I doubt it's by Model Racing though). Sorry, I can't share the ROMset. 
The set is missing vital parts: a section at the $4000 region, and 1KB at $0000-$03ff (game start, and irq handler resides there, so game doesn't work at all, damn). I've been studying it a bit, but can't figure out what game it is. If we can know with certainty which game it is, it could be added to MAME. It would be a shame to not share what I know.
Facts and near-facts:
- from ROM disasm: nearly certain that the CPU is i8080
- from ROM disasm:
* $0000-$1fff is ROM
* $2000-$23ff is user RAM
* $2400-$3fff is video RAM
* $4000-$???? is ROM
* $a400-$???? is color RAM
* I/O ports 0-3 are used for input and sound (I couldn't find proof that it uses a shift register, but it probably does)
- ROM has "NICHBUTSU" in it (yeah, typo)
- above statements make it near-certain that the game is running on Rolling Crash hardware (rollingc in MAME)
- after hacking and slashing with the MAME debugger and running the game as 'rollingc', I managed it to show something (no game action though =/).. the most interesting ones:
* http://crap.tsk-tsk.net/mr_unknown_h1.png
* http://crap.tsk-tsk.net/mr_unknown_h2.png
* http://crap.tsk-tsk.net/mr_unknown_h3.png
- last but not least, ROM as 1-bit picture (shuffled and rotated and whatnot, so I hope it's not against the rules :P .. about as legal as CPS2 xors): http://crap.tsk-tsk.net/mr_unknown_gfx.png
I was hoping it's Moon Raker, but I don't think it is. 
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Re: name the game (early 80s, spcinvaders hardware)
[Re: hap]
#242482 - 01/03/11 12:35 AM
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| gregf |
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Ramtek's Trivia promoter
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Reged: 09/21/03
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Loc: southern CA, US
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Re: name the game (early 80s, spcinvaders hardware)
[Re: Luca Elia]
#242486 - 01/03/11 12:59 AM
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Re: name the game (early 80s, spcinvaders hardware)
[Re: Luca Elia]
#242487 - 01/03/11 01:00 AM
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Probably not Moon Alpha, since that has the score at the bottom instead of the top.
ROM at $0000-$03ff was found, from another dump of an unknown Model Racing game. So it looks like it's a Model Racing set after all. With "NICHBUTSU" string in the ROM and hardware similarity to Rolling Crash, I'm still aiming my shots to Nichibutsu though, a Model Racing bootleg, that is :P
Right now the game boots and can be coined up. It jumps to $4000 when you start the game. That ROM(s) are still unavailable so that's where it just resets. Too bad the titlescreen is garbage:
- http://crap.tsk-tsk.net/mr_unknown_boots1.png
- http://crap.tsk-tsk.net/mr_unknown_boots2.png
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Re: name the game (early 80s, spcinvaders hardware)
[Re: hap]
#242490 - 01/03/11 02:44 AM
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Isn't there a tool that compares ROMs against MAME and identifies matches?
Maybe the set has some ROMs in common with an existing set.
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GroovyMAME support forum on BYOAC
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Re: name the game (early 80s, spcinvaders hardware)
[Re: krick]
#242491 - 01/03/11 03:06 AM
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yeah, 0 matches, hence it's interesting
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Re: name the game (early 80s, spcinvaders hardware)
[Re: hap]
#242496 - 01/03/11 04:09 AM
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Stiletto |
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They're always after me Lucky ROMS!
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Re: name the game (early 80s, spcinvaders hardware)
[Re: hap]
#242510 - 01/03/11 08:08 AM
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> yeah, 0 matches, hence it's interesting
What about... checking for similar binary code in ROMs? (not exact CRC's) Long, arduous task - but worth a shot...
- Stiletto
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Re: name the game (early 80s, spcinvaders hardware)
[Re: Robbbert]
#242527 - 01/03/11 05:57 PM
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If you got the romzies from a certain Italian site, then yes, it's very probable
I don't think I can get any further until the ROMs at $4000 are dumped; it seems the actual gameloop resides in that region.
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