Problem Dark Seal/Gates of Doom - Missing Sprites

Davespice

Newbie
vacBacker
Credits
72CR
Hi folks

I recently bought a Data East Dark Seal/Gates of Doom from a forum member about a month ago and was only able to test it this week (it had to be delivered to an address in the UK, and then taken in a car on a ferry to the Netherlands where I live). After powering it up and playing it I noticed that in 1 player mode there is an issue with disappearing sprites when the player takes damage. Maybe because it was in transit for a while the board has developed a fault.

Quick video from my phone;

I am thinking this is potentially a logic problem with the board where the player sprite is supposed to become translucent for a moment, this is achieved by rapidly making the player sprite flash and perhaps this is being done by TTL logic at hardware level. If there is a bad 74LS chip somewhere it may be that this rapid switching of the player sprite is not working. Strangely though, in two player mode if I chose the ninja as player 1 and the knight joins as player 2 the problem doesn't seem so bad.

Does anyone have any insight into this type of problem, and is there somewhere I can find the schematic for this board?
Cheers
Dave
 

Davespice

Newbie
vacBacker
Credits
72CR
Hi folks, just to let you know - I think we might have fixed it. It sounds like it could have been a bad contact or oxidation, we just removed the PALs and cleaned the legs using normal A4 copy paper as a light abrasive. Popped them back in and it now seems to be working fine.
 
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