Search found 46 matches

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: 336

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: 8
Views: 202

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: 336

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...
by pakosup
Wed Jan 06, 2021 3:34 am
Forum: NESdev
Topic: Mapper hacking and debugging.
Replies: 32
Views: 28276

Re: Mapper hacking and debugging.

I described my modification of mmc3 board in this post viewtopic.php?f=2&t=12421&start=15#p247101

You should use deprotected ROM (you need to apply patch that I posted in this thread earlier)

I don't have clear final picture.
20200104_163403.jpg
by pakosup
Wed Dec 16, 2020 12:31 am
Forum: NES Hardware and Flash Equipment
Topic: DeGlitching ppuA12 on mmc3 by software (vhdl or others)
Replies: 6
Views: 1705

Re: DeGlitching ppuA12 on mmc3 by software (vhdl or others)

Is the shaking graphics on mmc3 the result of ppu a12 glitch? Just remember such problem with the game "8-bit Adv Stains Gate" on hardware.
by pakosup
Sat Sep 19, 2020 6:50 am
Forum: NES Hardware and Flash Equipment
Topic: SP-80 Nes-On-Chip based famiclone
Replies: 5
Views: 5862

Re: SP-80 Nes-On-Chip based famiclone

I'm pretty sure that it has the same pinout.
I've checked several pins an they are match.
by pakosup
Sat Sep 19, 2020 6:31 am
Forum: NES Hardware and Flash Equipment
Topic: Dahua Sanguo (Yancheng YC-03-09 PCB, mapper 558)
Replies: 11
Views: 4542

Re: Dahua Sanguo (Yancheng YC-03-09 PCB, mapper 558)

I've never seen these games. Actually nj-1b and nj-1c for Final Fantasy VII. I made Diablo II from one of them.
Nj-1 for Pokemon Yellow.
by pakosup
Fri Sep 18, 2020 10:55 pm
Forum: NES Hardware and Flash Equipment
Topic: Dahua Sanguo (Yancheng YC-03-09 PCB, mapper 558)
Replies: 11
Views: 4542

Re: Dahua Sanguo (Yancheng YC-03-09 PCB, mapper 558)

When I tried to make Pokemon Yellow from FF VII board then it has freezed when screen is scrolled outside a home. So I have to bought original Pokemon Yellow cart.
By the way, I have several design of pcb with mapper 163.
NJ-1, NJ-1B, NJ-1C
20180421_143142~01.jpg
by pakosup
Fri Sep 18, 2020 1:21 pm
Forum: NES Hardware and Flash Equipment
Topic: 1818P based Famiclone - fix jailbars/distorted PCM?
Replies: 4
Views: 2407

Re: 1818P based Famiclone - fix jailbars/distorted PCM?

Clone on 1818p is quite common in Russia because first models of "Dendy" have this chip. You wont rid off jailbars completely, even if you build external video amplifier. You can try this scheme to fix sound: uGuFedOhVEg.jpg * Remove components marked with grey. "мкф" is uF https://youtu.be/VUQ7KATQ...
by pakosup
Fri Sep 18, 2020 12:23 pm
Forum: NES Hardware and Flash Equipment
Topic: Famicom 15 pin joypad - how it is wired?
Replies: 3
Views: 3182

Re: Famicom 15 pin joypad - how it is wired?

I thought that scheme for 3th and 4th controller is popular https://forums.nesdev.com/viewtopic.php?t=18066#p229366 In all japanese games where only 1 or 2 players available 3th and 4th will work like 1st and 2nd. More interesting how japanese 4-player adapter works. It uses a way from NES four scor...
by pakosup
Tue Aug 11, 2020 6:00 am
Forum: NES Hardware and Flash Equipment
Topic: Consequences of trying to disable CIRAM in clones that don't allow it?
Replies: 22
Views: 7133

Re: Consequences of trying to disable CIRAM in clones that don't allow it?

What happens when cartridges try to disable the internal CIRAM in clones where it's permanently enabled? I hear people saying that "games don't work", but what exactly is the visual result of trying to use these cartridges? In most cases pin for disabling ciram is used for detecting cartridge prese...
by pakosup
Mon Jun 01, 2020 1:05 pm
Forum: NES Hardware and Flash Equipment
Topic: Recommendation for dev cart?
Replies: 10
Views: 2663

Re: Recommendation for dev cart?

So dev cartridge is needed for testing purposes from time to time. I know that invitenes has some integration with assembler studio to debug in realtime on hardware. But i'm not sure that everdrive has something similar. So for debugging you don't have good alternatives to emulators. Topic starter h...
by pakosup
Mon Jun 01, 2020 7:45 am
Forum: NES Hardware and Flash Equipment
Topic: Recommendation for dev cart?
Replies: 10
Views: 2663

Re: Recommendation for dev cart?

Nowadays for retro gamedev you can use emulator. The only reason of using dev cartridge is unique hardware.
Also everdrive clone doesn't have much difference from original, so it can be used in the same way.
by pakosup
Fri May 29, 2020 5:31 am
Forum: NES Hardware and Flash Equipment
Topic: Famicom Grey Screen (no games running)
Replies: 13
Views: 5268

Re: Famicom Grey Screen (no games running)

Dwedit wrote:
Tue May 26, 2020 5:00 pm
Two bad CPUs sounds unlikely
It is quite real situation. I have repaired famicom where both cpu are gone due to short circuit in cartridge.

But it is better to buy replacement famicom board on ebay than buy chinese cpu. It is really high chance to get faulty cpu from aliexpess.