Search found 10930 matches

by lidnariq
Sun Aug 14, 2022 11:59 pm
Forum: NES Hardware and Flash Equipment
Topic: Street Fighter IV - MAPPER208 chip
Replies: 3
Views: 264

Re: Street Fighter IV - MAPPER208 chip

Last time we saw that specific combination it was one of the MMC3/VRC4 variants with both CHR ROM and CHR RAM
by lidnariq
Sat Aug 13, 2022 11:07 am
Forum: NES Hardware and Flash Equipment
Topic: AV/Power module sourface mount element
Replies: 9
Views: 667

Re: AV/Power module sourface mount element

Sure looks like it's almost working, and probably only needs the output voltage adjusted. Without any good evidence, I'm going to guess that part is a transistor or two, even though you only saw one pin pair with a diode drop. The Pirates! screen there looks close to right, but a little dark. Maybe ...
by lidnariq
Sat Aug 13, 2022 10:58 am
Forum: NES Hardware and Flash Equipment
Topic: EPSG for NES and Famicom (expansion sound module)
Replies: 17
Views: 6411

Re: EPSG for NES and Famicom (expansion sound module)

Kicad format schematics and gerbers and everything are in the github repository earlier in the thread.
by lidnariq
Fri Aug 12, 2022 9:41 pm
Forum: NES Hardware and Flash Equipment
Topic: AV/Power module sourface mount element
Replies: 9
Views: 667

Re: AV/Power module sourface mount element

That's not helpful. There were at least 7 different "RF" boxes that showed up on the front-loader, and that's only one version... and Electronix Corp's reverse-engineered schematic has some errors on at least one other sheet so I wouldn't count on this one being correct either.
by lidnariq
Fri Aug 12, 2022 11:21 am
Forum: NES Hardware and Flash Equipment
Topic: Dual D-Pad Controls (and a minor rant)
Replies: 19
Views: 1072

Re: Dual D-Pad Controls (and a minor rant)

gauauu wrote: Fri Aug 12, 2022 6:52 am This method doesn't scale up to 8 controllers though does it? (or maybe it does and I don't have my brain wrapped around it)
Correct, which is why I suggested using SNES controllers.
by lidnariq
Thu Aug 11, 2022 5:56 pm
Forum: NES Hardware and Flash Equipment
Topic: Dual D-Pad Controls (and a minor rant)
Replies: 19
Views: 1072

Re: Dual D-Pad Controls (and a minor rant)

SNES multitap requires both two OUT signals - one to restart the shift registers, another to switch between the two pairs of controllers.
by lidnariq
Thu Aug 11, 2022 11:16 am
Forum: NES Hardware and Flash Equipment
Topic: Dual D-Pad Controls (and a minor rant)
Replies: 19
Views: 1072

Re: Dual D-Pad Controls (and a minor rant)

It's been a dream of mine to build an 8-controller multitap (using the same principles as the 4-controller multi-tap). Let's make it happen. Can you forsake the "same principles as the 4-controller multi-tap"? Because that's a significant barrier. It both effectively prevents using SNES c...
by lidnariq
Thu Aug 11, 2022 10:33 am
Forum: General Stuff
Topic: Contributing to nescartdb?
Replies: 4
Views: 431

Re: Contributing to nescartdb?

Please do upload things to this thread!
by lidnariq
Wed Aug 10, 2022 9:06 pm
Forum: NESemdev
Topic: PPU timing problem with Donkey Kong (SOLVED)
Replies: 6
Views: 567

Re: PPU timing problem with Donkey Kong

That's the kind of bug I expect to see in hardware, not software... Somehow you're not reading from the address byte you think you are (the bottom 5 bits are good, the rest aren't), or you're not writing to the address byte you think you are. You're displaying the 14th, 18th, 26th, and ??th rows of ...
by lidnariq
Wed Aug 10, 2022 10:52 am
Forum: NES Hardware and Flash Equipment
Topic: AV/Power module sourface mount element
Replies: 9
Views: 667

Re: AV/Power module sourface mount element

Unfortunately de-soldering the smd element didn't resulted in any positive result for the video output. Is the SMD element still structural enough to see if it has any diode drops across it? My only guess is that it's one or two BJTs inside. The diodes from the bridge rectifier show a good result o...
by lidnariq
Tue Aug 09, 2022 3:40 pm
Forum: Other Retro Dev
Topic: Sega Mega Drive Clone - Region Switch Mod
Replies: 7
Views: 757

Re: Sega Mega Drive Clone - Region Switch Mod

Can you easily make/run a copy of the 240p test suite? It should tell you how the jumpers are wired.
by lidnariq
Mon Aug 08, 2022 1:57 pm
Forum: NES Hardware and Flash Equipment
Topic: AV/Power module sourface mount element
Replies: 9
Views: 667

Re: AV/Power module sourface mount element

Does your multimeter have a diode test? If so, can you see if there are any diode drops across the various pins? In purple is my best guess as to the primary baseband video path: 1_video_marked_cropped.jpg As such, you might be able to get away with just removing the 6-pin part altogether, depending...
by lidnariq
Mon Aug 08, 2022 10:11 am
Forum: NES Hardware and Flash Equipment
Topic: AV/Power module sourface mount element
Replies: 9
Views: 667

Re: AV/Power module sourface mount element

Do you have any diagnostic tools? (oscilloscope, voltmeter, &c) I don't recognize a 6-pin SOT23 part, but I agree it looks like it's part of the video path. You may be able to get away with bypassing it, or replacing it with "just" a transistor. Unfortunately, all the RF modulators are...
by lidnariq
Sun Aug 07, 2022 2:43 pm
Forum: NES Hardware and Flash Equipment
Topic: CIC AVR KRIKZZ NO WORK
Replies: 21
Views: 1115

Re: CIC AVR KRIKZZ NO WORK

On an original motherboard, the two-wire mod is less invasive: viewtopic.php?p=209346#p209346

On a brand new OpenTendo board, my variation requires fewer parts.
by lidnariq
Sun Aug 07, 2022 11:49 am
Forum: NES Hardware and Flash Equipment
Topic: CIC AVR KRIKZZ NO WORK
Replies: 21
Views: 1115

Re: CIC AVR KRIKZZ NO WORK

You don't even really need the nullCIC - you can just apply the "two wires" mod even without the CIC populated at all.