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by lidnariq
Sat Jun 19, 2021 3:15 pm
Forum: NES Hardware and Flash Equipment
Topic: Famicom RGB mod: noob question about ppu [updated]
Replies: 10
Views: 239

Re: Famicom RGB mod: noob question about ppu [updated]

Yikes, you refer the wiring from the ppu right? the one marked in red in the attachment? Just checked continuity between PPU pin and adapter board, and no success :oops: (even if the diagram shows they are joint). I'll check de solder point and try again. UPDATE: Just checked solder points and they...
by lidnariq
Sat Jun 19, 2021 1:39 pm
Forum: Other Retro Dev
Topic: Create a correct multirom on Sega MegaDrive (Genesis)
Replies: 1
Views: 38

Re: Create a correct multirom on Sega MegaDrive (Genesis)

Don't post copyrighted material here, unless it's published available under a permissive license.

As far as your actual question ... connect the ROM's highest address line to a switch. Pad both games to 2MB. Concatenate them.
by lidnariq
Sat Jun 19, 2021 1:02 pm
Forum: NES Hardware and Flash Equipment
Topic: Famicom RGB mod: noob question about ppu [updated]
Replies: 10
Views: 239

Re: Famicom RGB mod: noob question about ppu [updated]

Those wiggles imply that the NESRGB is failing to find the correct pixel clock. (I don't know why). I'd maybe check the wiring you have for the 21.47MHz clock, and see if that helps at all
by lidnariq
Sat Jun 19, 2021 11:28 am
Forum: NES Hardware and Flash Equipment
Topic: Famicom RGB mod: noob question about ppu [updated]
Replies: 10
Views: 239

Re: Famicom RGB mod: noob question about ppu [updated]

Is it good for every first ten-ish seconds after power on? Or just the one time?
by lidnariq
Thu Jun 17, 2021 7:44 pm
Forum: NES Hardware and Flash Equipment
Topic: Famicom RGB mod: noob question about ppu [updated]
Replies: 10
Views: 239

Re: Famicom RGB mod: noob question about ppu

Pins 14-17 are completely ignored by the NESRGB mod - those pins are now reused to get the digital color out of the PPU. So you could even leave them messy. If you want to be able to revert to stock and install the plain PPU back in the socket without the NESRGB mod, then leaving those pins floating...
by lidnariq
Thu Jun 17, 2021 6:07 pm
Forum: Other Retro Dev
Topic: NDS Cartridge ROM specs
Replies: 53
Views: 34645

Re: NDS Cartridge ROM specs

Kinda reminiscent of "next generation" genome sequencing :)
by lidnariq
Wed Jun 16, 2021 12:10 pm
Forum: NESdev
Topic: NES vertical artifacts after cuted 4th pin CIC pal ver
Replies: 26
Views: 1619

Re: NES vertical artefacts after cuted 4th leg CIC pal ver

Yes, the main PCB, or the socket, or the solder.
by lidnariq
Wed Jun 16, 2021 10:47 am
Forum: NESdev
Topic: NES vertical artifacts after cuted 4th pin CIC pal ver
Replies: 26
Views: 1619

Re: NES vertical artefacts after cuted 4th leg CIC pal ver

Yeah, I don't think it's the PPU. I think it's the circuit board.
by lidnariq
Wed Jun 16, 2021 9:42 am
Forum: NESdev
Topic: NES vertical artifacts after cuted 4th pin CIC pal ver
Replies: 26
Views: 1619

Re: NES vertical artefacts after cuted 4th leg CIC pal ver

... yeah, that's bad. Somehow you've got a bad connection that's overriding PPU A13 = pin 25. No idea how, but both the voltage on the pin and the resistance you've told me imply that's what's wrong.
by lidnariq
Wed Jun 16, 2021 8:59 am
Forum: NESdev
Topic: NES vertical artifacts after cuted 4th pin CIC pal ver
Replies: 26
Views: 1619

Re: NES vertical artefacts after cuted 4th leg CIC pal ver

rafalnir wrote:
Wed Jun 16, 2021 5:47 am
When is off I has 0V on pins 5 and 6.
Measure resistance from 74HCU04 pin 5 to pin 14?
by lidnariq
Tue Jun 15, 2021 1:51 pm
Forum: NESdev
Topic: NES vertical artifacts after cuted 4th pin CIC pal ver
Replies: 26
Views: 1619

Re: NES vertical artefacts after cuted 4th leg CIC pal ver

While off, check if something is connecting either 74HCU04 pins 5 or 6 to +5V.

Given that you have two PPUs with the same flaw, I really don't think it's a flaw of the PPU, but I admit I'm beginning to run out of ideas.
by lidnariq
Tue Jun 15, 2021 11:32 am
Forum: NESdev
Topic: NES vertical artifacts after cuted 4th pin CIC pal ver
Replies: 26
Views: 1619

Re: NES vertical artefacts after cuted 4th leg CIC pal ver

Is this with a cartridge in, while it's displaying that artifact?
by lidnariq
Mon Jun 14, 2021 3:45 pm
Forum: NESdev
Topic: NES vertical artifacts after cuted 4th pin CIC pal ver
Replies: 26
Views: 1619

Re: NES vertical artefacts after cuted 4th leg CIC pal ver

Regardless, I don't think it's relevant to the symptoms you're seeing. If your multimeter has a logic tester mode, check if PPU pin 25 (A13) is going both high and low when powered. Then check if 74HCU04 pins 5 and 6 are also. Finally, check if PPU RAM pin 18 is also. If it doesn't have a logic test...
by lidnariq
Mon Jun 14, 2021 11:24 am
Forum: NESdev
Topic: NES vertical artifacts after cuted 4th pin CIC pal ver
Replies: 26
Views: 1619

Re: NES vertical artefacts after cuted 4th leg CIC pal ver

rafalnir wrote:
Mon Jun 14, 2021 11:14 am
In good nes this blue has 1.3uF. Maybe this blue is damage?
instead of 0.5uF? I mean, probably. NESes are pretty old. But I don't think it's relevant to the symptoms you're seeing.