Raiden Fighters JET Checksum Error 9921

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Moonwalker
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Raiden Fighters JET Checksum Error 9921

Postby Moonwalker » December 4th, 2017, 4:19 pm

Hi everybody,

I have a problem with my RFJ cart. I plugged it into the SPI board and got Checksum Error 9921.
The SPI board had Viper Phase 1 in before, which still runs fine.

When I checked the Wiki I found the jumper issue for changing carts, but that didn´t help either. The main board is the V 2.0 PCB.
The jumper change does not trigger anything - no boot up mode or whatsoever.

As far as I see both carts are japanese.

Help would be really appreciated.

Here the pics:

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Spork
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Re: Raiden Fighters JET Checksum Error 9921

Postby Spork » December 5th, 2017, 8:59 pm

The first thing I'd do on a checksum error is dump all the socketed roms with an eprom programmer and compare the CRC32s against the mame set(s). If you don't yet have a programmer I guess you could remove and reseat all the roms in case a leg isn't making a connection and that is causing the error.
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Re: Raiden Fighters JET Checksum Error 9921

Postby thomj » December 5th, 2017, 9:26 pm

It's most likely a region code incompatibility i.e them not both being JP region. Plenty of info here: https://shmups.system11.org/viewtopic.php?f=6&t=34314
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Re: Raiden Fighters JET Checksum Error 9921

Postby Pythagoras » December 6th, 2017, 8:51 am

If you have an eprom burner, I can guide you how to make the cart accept all regions. 8-)
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Re: Raiden Fighters JET Checksum Error 9921

Postby DaveyD » December 6th, 2017, 9:46 am

Taken from here: https://www.arcade-museum.com/game_deta ... me_id=9246

The Seibu SPI system is cartridge-based with all game data on the daughterboards, so a game can easily be switched in except for Raiden Fighters Jet, which uses a modified version of the SPI motherboard. To switch a game, simply swap the daughterboard.
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Re: Raiden Fighters JET Checksum Error 9921

Postby Moonwalker » December 6th, 2017, 1:59 pm

Spork wrote:The first thing I'd do on a checksum error is dump all the socketed roms with an eprom programmer and compare the CRC32s against the mame set(s). If you don't yet have a programmer I guess you could remove and reseat all the roms in case a leg isn't making a connection and that is causing the error.


Thank you. I checked all Eproms and pushed them back in. Everything seems ok. I don´t have a burner sadly.

thomj wrote:It's most likely a region code incompatibility i.e them not both being JP region. Plenty of info here: https://shmups.system11.org/viewtopic.php?f=6&t=34314


Thanks, both seem Japanese. But I will try anyway.

Pythagoras wrote:If you have an eprom burner, I can guide you how to make the cart accept all regions. 8-)


Great, I don´t have a burner, but could ask a friend. Would you please tell me how to proceed?

DaveyD wrote:Taken from here: https://www.arcade-museum.com/game_deta ... me_id=9246

The Seibu SPI system is cartridge-based with all game data on the daughterboards, so a game can easily be switched in except for Raiden Fighters Jet, which uses a modified version of the SPI motherboard. To switch a game, simply swap the daughterboard.


I see that for the first time. Can anybody here confirm that RFJ needs a modified SPI board? Some people seem to have switched carts with a Viper mobo.

Thank you everybody!
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Re: Raiden Fighters JET Checksum Error 9921

Postby Pythagoras » December 6th, 2017, 3:24 pm

Post subject: Re: SPI SXX2D RAIDEN FIGHTERS JET
PostPosted: Mon Apr 04, 2016 9:34 pm

Ed Oscuro

No, you don't need a particular version motherboard to run Jet. There have been lots of SPI rumors, like that Jet ran the CPU at a faster clock speed (for some reason Ghegs' RF Emporium page claims this, it's not true). This is another bad rumor. Jet was a later release so you often find it with the late revision motherboard - that's probably all there is to it.

I don't know why Seibu made the first motherboard revision or what changed. The next and final revision - the small version motherboard - was likely done for cost-cutting reasons, just like Raiden Fighters 2000 and the OKI system variants. The small version motherboard seems to have pretty bad video quality compared to the original so I'd avoid it.

https://shmups.system11.org/viewtopic.php?f=6&t=57024


This can also be comfirmed in the mame driver. "SXX2D: This is a smaller (and perhaps cheaper) version of the SXX2C hardware."

There are no significant changes between the revisions, clock speed, memory etc is all the same...
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Re: Raiden Fighters JET Checksum Error 9921

Postby Pythagoras » December 6th, 2017, 3:57 pm

Moonwalker wrote:Great, I don´t have a burner, but could ask a friend. Would you please tell me how to proceed?


For the Japanese revision of Raiden Fighters Jet:

Fist dump the eprom labled "PRG 2",
then load the file into a a hex editor and change the byte at offset $313A2. From "01" to "03".
and reburn the eprom.

The modificaton will now let your cartridge accept all motherboard regions.
So after this modification the the game should proceed with the flashing process as expected.
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Re: Raiden Fighters JET Checksum Error 9921

Postby Moonwalker » December 6th, 2017, 4:50 pm

Great, thank you very much Pythagoras! :)
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Re: Raiden Fighters JET Checksum Error 9921

Postby Pythagoras » December 6th, 2017, 5:25 pm

You are welcome, don't forget to keep us updated with the progress.
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Re: Raiden Fighters JET Checksum Error 9921

Postby Moonwalker » December 7th, 2017, 10:51 am

I will :)
Looking for somebody to burn it right now.

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