VRC4 reproduction problems

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mir2sila
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Joined: Tue Feb 05, 2019 1:25 pm

VRC4 reproduction problems

Post by mir2sila »

Hello friends. Someone can help me. I want to make a Japanese one Teenage Mutant Ninja Turtles, as a donor I took the game Racer Mini Yonku: Japan Cup .And faced with the following problem.The game runs, but has graphic artifacts.You can help fix this.EPROM PIN 30 (CHR A17) I connected to the 28th leg of the mapper.EPROM PIN 2 (CHR A16) to 22 Mapper Leg.CE (PIN22 EPROM) on the 10th leg of the mapper.OE (PIN 24 EPROM) connected to the ground.The other pins match.I can't figure out what I'm doing wrong.I use eprom W27C020
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Quietust
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Re: VRC6 CHR Bank Malformed?

Post by Quietust »

mir2sila wrote: Tue May 18, 2021 9:28 am Hello friends. Someone can help me. I want to make a Japanese one Teenage Mutant Ninja Turtles, as a donor I took the game Racer Mini Yonku: Japan Cup .And faced with the following problem.The game runs, but has graphic artifacts.You can help fix this.EPROM PIN 30 (CHR A17) I connected to the 28th leg of the mapper.EPROM PIN 2 (CHR A16) to 22 Mapper Leg.CE (PIN22 EPROM) on the 10th leg of the mapper.OE (PIN 24 EPROM) connected to the ground.The other pins match.I can't figure out what I'm doing wrong.I use eprom W27C020
This is the 3rd thread in which you've posted this message, and this one is definitely the wrong place to ask.

I would advise you to create a new topic in the NES Hardware -> Reproductions forum.
Quietust, QMT Productions
P.S. If you don't get this note, let me know and I'll write you another.
mir2sila
Posts: 26
Joined: Tue Feb 05, 2019 1:25 pm

Re: VRC6 CHR Bank Malformed?

Post by mir2sila »

Quietust wrote: Tue May 18, 2021 9:32 am
mir2sila wrote: Tue May 18, 2021 9:28 am Hello friends. Someone can help me. I want to make a Japanese one Teenage Mutant Ninja Turtles, as a donor I took the game Racer Mini Yonku: Japan Cup .And faced with the following problem.The game runs, but has graphic artifacts.You can help fix this.EPROM PIN 30 (CHR A17) I connected to the 28th leg of the mapper.EPROM PIN 2 (CHR A16) to 22 Mapper Leg.CE (PIN22 EPROM) on the 10th leg of the mapper.OE (PIN 24 EPROM) connected to the ground.The other pins match.I can't figure out what I'm doing wrong.I use eprom W27C020
This is the 3rd thread in which you've posted this message, and this one is definitely the wrong place to ask.

I would advise you to create a new topic in the NES Hardware -> Reproductions forum.
I'm here quite recently, and I don't know how to create a theme on my own.So I hope that someone will accidentally see my message and help me.
lidnariq
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Re: VRC4 reproduction problems

Post by lidnariq »

I have split this to a new thread, and deleted the duplicates.

Konami's PCBs should not have required any rework, to the best of my memory.
mir2sila
Posts: 26
Joined: Tue Feb 05, 2019 1:25 pm

Re: VRC4 reproduction problems

Post by mir2sila »

lidnariq wrote: Tue May 18, 2021 1:09 pm I have split this to a new thread, and deleted the duplicates.

Konami's PCBs should not have required any rework, to the best of my memory.
Thanks.There are boards from KONAMI where you need to redirect addresses.In most cases, these are boards where there are 28 holes,instead of the necessary 32.I've done games on a VRC chip before, and they worked.And this time it didn't work out.Here is a photo of my reproduction.Image[/img]
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lidnariq
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Re: VRC4 reproduction problems

Post by lidnariq »

mir2sila wrote: Tue May 18, 2021 3:21 pm There are boards from KONAMI where you need to redirect addresses. In most cases, these are boards where there are 28 holes, instead of the necessary 32.
Oh, specifically the 28-pin 128KB mask ROMs. Sure. Other than those, there should be no other rework.

You shouldn't have needed to connect CHR A17 or PRG A17, because both your PROMs are only 128KB in size.

There's nothing obviously wrong with your wiring. You moved A16 as needed on both ROMs, and presumably fixed both /OE and /CE on both chips (although I can't see from your photos).

... i wonder if you need to tie Vpp (pin 1) to +5V? The datasheet for the W27C010 isn't clear.
mir2sila
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Re: VRC4 reproduction problems

Post by mir2sila »

lidnariq wrote: Tue May 18, 2021 3:38 pm
mir2sila wrote: Tue May 18, 2021 3:21 pm There are boards from KONAMI where you need to redirect addresses. In most cases, these are boards where there are 28 holes, instead of the necessary 32.
Oh, specifically the 28-pin 128KB mask ROMs. Sure. Other than those, there should be no other rework.

You shouldn't have needed to connect CHR A17 or PRG A17, because both your PROMs are only 128KB in size.

There's nothing obviously wrong with your wiring. You moved A16 as needed on both ROMs, and presumably fixed both /OE and /CE on both chips (although I can't see from your photos).

... i wonder if you need to tie Vpp (pin 1) to +5V? The datasheet for the W27C010 isn't clear.
these are both w27c020 chips (256 KB), the Chinese incorrectly entered the marking.My programmer confirmed this, that these are exactly 256 kb chips.

The OE signal goes to the OE VRC4, and the SE signal goes to the ground.VPP in the air.
lidnariq
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Re: VRC4 reproduction problems

Post by lidnariq »

mir2sila wrote: Tue May 18, 2021 3:48 pm The OE signal goes to the OE VRC4, and the SE signal goes to the ground.
That's correct for PRG, but what did you do for CHR?
VPP in the air.
The W27C010 datasheet isn't clear about whether that is OK. (It only says 5V, 12V, or 14V are permitted). You could try tying it to +5V and see if it changes anything.
mir2sila
Posts: 26
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Re: VRC4 reproduction problems

Post by mir2sila »

lidnariq wrote: Tue May 18, 2021 3:54 pm
mir2sila wrote: Tue May 18, 2021 3:48 pm The OE signal goes to the OE VRC4, and the SE signal goes to the ground.
That's correct for PRG, but what did you do for CHR?
VPP in the air.
The W27C010 datasheet isn't clear about whether that is OK. (It only says 5V, 12V, or 14V are permitted). You could try tying it to +5V and see if it changes anything.
For CHR, everything is the same as for PRG
I connected the VPP to 5 volts, nothing has changed
lidnariq
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Re: VRC4 reproduction problems

Post by lidnariq »

CHR CE and OE are connected to ground and VRC4 pin 10?
mir2sila
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Re: VRC4 reproduction problems

Post by mir2sila »

lidnariq wrote: Tue May 18, 2021 4:08 pm CHR CE and OE are connected to ground and VRC4 pin 10?
CHR CE is connected to VRC-4 PIN 10
CHR OE Connected to ground
lidnariq
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Re: VRC4 reproduction problems

Post by lidnariq »

Unfortunately, that uses up all the ideas I have as to why you're having problems.
mir2sila
Posts: 26
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Re: VRC4 reproduction problems

Post by mir2sila »

lidnariq wrote: Tue May 18, 2021 4:13 pm Unfortunately, that uses up all the ideas I have as to why you're having problems.
In any case, thank you so much for trying to help, maybe someone else will see it, and will be able to give an idea.In the meantime, I'll try to reprogram the CHR.
mir2sila
Posts: 26
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Re: VRC4 reproduction problems

Post by mir2sila »

mir2sila wrote: Tue May 18, 2021 4:15 pm
lidnariq wrote: Tue May 18, 2021 4:13 pm Unfortunately, that uses up all the ideas I have as to why you're having problems.
In any case, thank you so much for trying to help, maybe someone else will see it, and will be able to give an idea.In the meantime, I'll try to reprogram the CHR.
I reprogrammed the CHR, Replaced it with another EPROM 27C020, but nothing has changed((
pakosup
Posts: 58
Joined: Mon Apr 24, 2017 10:23 pm

Re: VRC4 reproduction problems

Post by pakosup »

Just check all address lines of chr, probably someone is teared off.
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