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by lidnariq
Wed Jun 16, 2021 12:10 pm
Forum: NESdev
Topic: NES vertical artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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 artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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 artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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 artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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 artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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 artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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 artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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 artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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.
by lidnariq
Mon Jun 14, 2021 10:27 am
Forum: NESdev
Topic: NES vertical artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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

You said you replaced the PPU. Could you check whether all the pins are making good contact? There aren't a lot of things that could possibly cause the symptoms you're seeing. PPU A13 (pin 25) goes to the cartridge, where it should enable the CHR ROM. PPU A13 also goes to the inverter (pin 5), where...
by lidnariq
Mon Jun 14, 2021 9:26 am
Forum: NESdev
Topic: NES vertical artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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

That's the "open bus" pattern. Somehow neither NES-internal NT RAM nor the cart CHR ROM are ever being enabled. Try touching your fingers to PPU pins 38-25 while it's operating. You should see the image change. https://wiki.nesdev.com/w/index.php/PPU_pin_out_and_signal_description While your NES is ...
by lidnariq
Sun Jun 13, 2021 9:42 pm
Forum: Newbie Help Center
Topic: Trying to dump my first NES game... :)
Replies: 60
Views: 29404

Re: Trying to dump my first NES game... :)

Would you be willing to upload all of these pictures to the forum here, or do I have your permission to do the same?
by lidnariq
Sun Jun 13, 2021 4:38 pm
Forum: NESemdev
Topic: PAL color palette emulation
Replies: 81
Views: 63435

Re: PAL color palette emulation

Most SDTV capture cards sample at 13.5MHz, as per Rec. 601; at this speed, a PAL scanline is 703 out of 864 pixels long, an NTSC scanline is 704 out of 858 pixels long, and neither have a square pixel aspect ratio. For square pixels, PAL should sample at 14.75MHz (also per Rec. 601) an NTSC at 12 3 ...
by lidnariq
Sun Jun 13, 2021 4:18 pm
Forum: NESdev
Topic: NES vertical artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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

Could you share a picture of the artifacts now? Feel free to upload it to the forum here.
by lidnariq
Sun Jun 13, 2021 1:12 pm
Forum: NESdev
Topic: NES vertical artefacts after cuted 4th leg CIC pal ver
Replies: 26
Views: 1130

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

It's more likely you damaged some capacitor when you were reaching in to cut the 4th pin of the CIC.

I don't think your PPU is damaged.
by lidnariq
Wed Jun 09, 2021 11:56 am
Forum: NES Hardware and Flash Equipment
Topic: Holy Diver works on Famicom but not on NES
Replies: 8
Views: 769

Re: Holy Diver works on Famicom but not on NES

(Does the circuit board look at all different from the one in NesCartDB? http://bootgod.dyndns.org:7777/profile.php?id=4038 )