[help] konami surprise attack schematic wanted

[TheCrow]

Hello everyone,
I’m really in need for the schematics for Konami surprise attack , I have two rams that come as bad, replacing the rams didn’t fix the issue, please help,
Thank you.

 

[Darksoft]

I haven't seen them. Maybe someone here can shed some light.

 

[caius]

If the RAMs are reported bad although you replaced them it means that they cannot be reached/adressed by the device that wants to read/write them.Schematics of this PCB are not available but you can easily figure out which device the RAMs are connected to.If the RAMs are the WORK ones they are addressed by main CPU, if the RAMs are for other use (for GFX, for example) most likely they are connected to some custom ASICs (typical Konami design).So, first of all, check for broken traces between the RAMs and the device connected to them.

 

[Darksoft]

If the RAMs are reported bad although you replaced them it means that they cannot be reached/adressed by the device that wants to read/write them.Schematics of this PCB are not available but you can easily figure out which device the RAMs are connected to.If the RAMs are the WORK one they are addressed by main CPU, if the RAMs are for other use (for GFX, for example) most likely they are connected to some custom ASICs (typical Konami design).So, first of all, check for broken traces between the RAMs and the device connected to them.

Master caius has spoken. I couldn't have said it better.

 

[TheCrow]

If the RAMs are reported bad although you replaced them it means that they cannot be reached/adressed by the device that wants to read/write them.Schematics of this PCB are not available but you can easily figure out which device the RAMs are connected to.If the RAMs are the WORK ones they are addressed by main CPU, if the RAMs are for other use (for GFX, for example) most likely they are connected to some custom ASICs (typical Konami design).So, first of all, check for broken traces between the RAMs and the device connected to them.

Thank you so much for the information I really appreciate it, I’ll try to trace back where the rams enable and write connect to