DDP DOJ

PCB problems and fixes
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gros93
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DDP DOJ

Post by gros93 » January 21st, 2019, 9:11 am

Hi,
I would like to know the pcb's behaviour when you toggle the SW1 switch on the dodonpachi doj pcb ?
Here my game is bugging, it's normal ?
thank for your help

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yosai
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Re: DDP DOJ

Post by yosai » January 21st, 2019, 9:34 am

It clears the battery backed RAM. Don't try it on a BL PCB.

http://www.world-of-arcades.net/Cave/Dd ... rdware.htm

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gros93
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Re: DDP DOJ

Post by gros93 » January 21st, 2019, 10:12 am

Ok but it's reset the game ? restart ? service mode ?

Asure
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Re: DDP DOJ

Post by Asure » January 21st, 2019, 2:36 pm

If you have the original Black Label PCB with no fixed eprom, it has some battery backed data in NVRAM to allow the game to boot and present the OLD / NEW selection menu.
The game checks the NVRAM each time at boot. The battery stores a magic value in NVRAM.

If you use the switch, on DDP DOJ Black Label boards it will empty the NVRAM and break the game. It no longer will boot correctly as the check fails (nvram empty=check fail!) rendering you with a non-working game.

The question is, do you have a Black Label board, or the original non-Black Label?
If it's black label, you do NOT use the switch ever.
The board requires special care to swap the battery and preserve NVRAM.

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trev1976
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Re: DDP DOJ

Post by trev1976 » January 21st, 2019, 9:15 pm

Why couldn't of cave removed that switch on the BL version ? So dicey
Check out my "1cc" YouTube Channel
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gros93
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Re: DDP DOJ

Post by gros93 » January 22nd, 2019, 3:27 pm

Thank you guys !
Not mine is a white label. A friend has help me and it's normal, the game crash when you're toggling the SW1 in game.

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