Search found 58 matches

by pakosup
Thu Jul 13, 2023 7:08 am
Forum: NES Hardware and Flash Equipment
Topic: Best clone cpu/ppu for opentendo NESRGB Everdrive use?
Replies: 9
Views: 1865

Re: Best clone cpu/ppu for opentendo NESRGB Everdrive use?

you can find a junked Famicom lot for extremely cheap, and those aren't guaranteed G revision chips. Actually it is guaranteed, if label has FF mark. Any famiclone chip has issue with swapped emphasis bits (not sure that it is matter for NESRGB), most cpu have swapped duty cycles. And all clone ppu...
by pakosup
Thu Jun 29, 2023 1:22 am
Forum: NES Hardware and Flash Equipment
Topic: Family Computer blue screen
Replies: 5
Views: 982

Re: Family Computer blue screen

You won't find working ua6527 in aliexpress. In most cases it would be ua6528p with changed marking.
Probably your current cpu isn't dead. Check the contact in the slot and use working cartridge.
by pakosup
Thu Jun 22, 2023 10:32 am
Forum: NES Hardware and Flash Equipment
Topic: Family Computer blue screen
Replies: 5
Views: 982

Re: Family Computer blue screen

ppu works but cpu doesn't
by pakosup
Thu Jun 22, 2023 10:26 am
Forum: NES Hardware and Flash Equipment
Topic: Best clone cpu/ppu for opentendo NESRGB Everdrive use?
Replies: 9
Views: 1865

Re: Best clone cpu/ppu for opentendo NESRGB Everdrive use?

Why you want to find cpu clones? Now it is hard to do, because of too many faulty ones from aliexpress. For NTSC system it is better to use original ppu and cpu of G revision. You can buy famicom or NES board to desolder.
by pakosup
Mon Oct 24, 2022 8:40 am
Forum: NES Hardware and Flash Equipment
Topic: Datach repro problem with I2C on "Battle_Rush"
Replies: 4
Views: 1899

Re: Datach repro problem with I2C on "Battle_Rush"

Maybe I'm lucky, but the first x24c01 that I bought on AliExpress working well.
by pakosup
Sun Jun 27, 2021 9:56 pm
Forum: NES Hardware and Flash Equipment
Topic: Family Ace FCR-1000 - famicom cartridge copier
Replies: 1
Views: 1160

Re: Family Ace FCR-1000 - famicom cartridge copier

I saw the model with builtin UV lamp. I also have a couple of such cartridges. They are used for distribution of Super Maruo adult game.
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by pakosup
Wed Jun 02, 2021 4:35 am
Forum: NES Hardware and Flash Equipment
Topic: Glitched sprites using Game Doctor 6+ with Playchoice PPU
Replies: 6
Views: 2324

Re: Glitched sprites using Game Doctor 6+ with Playchoice PPU

CHR memory address bus. The noise is appearing due to not correct address set for chr memory, but after some time address becomes valid, and we see sprites more clear then the noise. So the question is why this delay happen. It can be result of slow memory, but device works fine with another console...
by pakosup
Mon May 31, 2021 10:30 pm
Forum: NES Hardware and Flash Equipment
Topic: Glitched sprites using Game Doctor 6+ with Playchoice PPU
Replies: 6
Views: 2324

Re: Glitched sprites using Game Doctor 6+ with Playchoice PPU

For me it looks like low voltage on address bus, so rising front delay happen. Maybe I'm wrong.
by pakosup
Wed May 19, 2021 9:41 am
Forum: NES Hardware and Flash Equipment
Topic: VRC4 reproduction problems
Replies: 26
Views: 6549

Re: VRC4 reproduction problems

It can be problem with all of your eeproms or installed mapper revision doesn't support management of a17 chr. And probably it is done on purpose like the other Konami anti-piracy tricks.
by pakosup
Wed May 19, 2021 6:13 am
Forum: NES Hardware and Flash Equipment
Topic: VRC4 reproduction problems
Replies: 26
Views: 6549

Re: VRC4 reproduction problems

Just check all address lines of chr, probably someone is teared off.
by pakosup
Mon Apr 26, 2021 10:07 pm
Forum: NES Hardware and Flash Equipment
Topic: VRC6b conversion to VRC6a - Madara to Akumajo Densetsu question.
Replies: 12
Views: 5271

Re: VRC6b conversion to VRC6a - Madara to Akumajo Densetsu question.

32pin 27x is compatible with konami board, but to place Akumajou Densetsu to Madara board you should swap two address for mapper (a0 and a1).
by pakosup
Thu Jan 21, 2021 8:25 am
Forum: NES Hardware and Flash Equipment
Topic: White screen on new opentendo build, no signal on M2
Replies: 15
Views: 9476

Re: White screen on new opentendo build, no signal on M2

Through an accidental shorting when two capacitor legs were touching, I started seeing a signal on M2, and trying it properly with no capacitors and direct connection across pads, it loads up a game. I know the case when CPU starts only with C44 2n2. And if you short pads then CPU can start heating...
by pakosup
Mon Jan 18, 2021 9:39 pm
Forum: NES Hardware and Flash Equipment
Topic: Converting PAL to NTSC using Famicom
Replies: 11
Views: 5802

Re: Converting PAL to NTSC using Famicom

PPU of E revision has a bug with reading palette, so using it with Everdrive leads to incorrect restoring of save states in games.
by pakosup
Mon Jan 18, 2021 9:30 pm
Forum: NES Hardware and Flash Equipment
Topic: White screen on new opentendo build, no signal on M2
Replies: 15
Views: 9476

Re: White screen on new opentendo build, no signal on M2

All UMC CPUs are quite pickie to clock signal. So you can play around with capacitor between generator and cpu.
by pakosup
Mon Jan 18, 2021 10:51 am
Forum: NES Hardware and Flash Equipment
Topic: Converting PAL to NTSC using Famicom
Replies: 11
Views: 5802

Re: Converting PAL to NTSC using Famicom

Depending on what's available to you, it might be preferable to use famiclone parts (e.g. UA6527, UA6528) instead of a real famicom, and/or to use the real famicom as a famicom. It is hard to find working ones. So buying a famicom is preferable. Also better to use processors with G or H revision, s...