Search found 9281 matches

by lidnariq
Wed May 27, 2020 7:53 pm
Forum: NES Hardware and Flash Equipment
Topic: Connecting NES to Teddy Ruxpin
Replies: 21
Views: 492

Re: Connecting NES to Teddy Ruxpin

I think that the eyes, nose, and mouth are each controlled by one 1.5volt C battery. The bigger issue is -- you can't actually just flow power through them to get them to move. https://www.youtube.com/watch?v=34cfkA9HlXk Uh... that hypothesis is not supported by the video at all. For one, there's n...
by lidnariq
Wed May 27, 2020 6:18 pm
Forum: NES Hardware and Flash Equipment
Topic: Connecting NES to Teddy Ruxpin
Replies: 21
Views: 492

Re: Connecting NES to Teddy Ruxpin

The first test is going to be -- can I get power to flow from the NES to the motors and move the eyes? Not without exceeding what you're allowed to draw from the NES's controller port. Right now, I'm trying to find a Teddy Ruxpin that has a cassette player that is truly broken. I don't want to rip ...
by lidnariq
Wed May 27, 2020 11:30 am
Forum: Newbie Help Center
Topic: Trying to dump my first NES game... :)
Replies: 17
Views: 257

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

It can be reverted!
isQOdWN-reset-detector-circuit.jpg
isQOdWN-reset-detector-circuit.jpg (24.19 KiB) Viewed 40 times
To dump the cart, you'll either need to desolder and disconnect one side of the resistor (outlined in purple)
or short out the capacitor (outlined in white).

To revert it ... just undo that.
by lidnariq
Tue May 26, 2020 11:23 pm
Forum: NES Hardware and Flash Equipment
Topic: Recover PPU./WR when ppu writes to palette, possible?
Replies: 3
Views: 113

Re: Recover PPU./WR when ppu writes to palette, possible?

From what I'm learned, when PPU is writing to palette, NESRGB just cheats PPU and backups the data in its palette RAM. So that the real color can be retrived from this index table and a index -> RGB color LUT using EXT0~3. Am I correct? Yes. Specifically, the NESRGB and HDNES keep track of the orig...
by lidnariq
Tue May 26, 2020 9:57 pm
Forum: Newbie Help Center
Topic: Can NMI while you're inside the NMI handler?
Replies: 4
Views: 121

Re: Can NMI while you're inside the NMI handler?

I'm working on a small project where the main for my game is in NMI. It got me thinking, is it possible if your NMI runs too many instructions, could the NMI interrupt again while you're already executing code? Yes. If so would the remedy just to disable and re-enable NMI every time you enter the N...
by lidnariq
Tue May 26, 2020 9:02 pm
Forum: NES Hardware and Flash Equipment
Topic: Recover PPU./WR when ppu writes to palette, possible?
Replies: 3
Views: 113

Re: Recover PPU./WR when ppu writes to palette, possible?

when the last code "sta $2007" is executed (or is executing? I'm not sure...) on the CPU, 0 is asserted on PPU./CS indicating the PPU being selected, $7 is asserted on CPU.A0~CPU.A2 indicating the PPU register $2007 being selected, 0 is asserted on CPU.R/W indicating the register $2007 is being wri...
by lidnariq
Tue May 26, 2020 3:37 pm
Forum: NES Hardware and Flash Equipment
Topic: Famicom Grey Screen (no games running)
Replies: 11
Views: 220

Re: Famicom Grey Screen (no games running)

... Two bad 2A03s? How cursed. I have a page on the wiki here about Famicom/Famiclone/NES CPUs: https://wiki.nesdev.com/w/index.php/User:Lidnariq/Known_CPU_revisions The UA6527 would work with some caveats, but even though the photo you have there says only "UA6527", the listing says "UA6527P" which...
by lidnariq
Tue May 26, 2020 1:53 pm
Forum: NES Hardware and Flash Equipment
Topic: Japan 126/127 chip
Replies: 2
Views: 84

Re: Japan 126/127 chip

Those are copy protection ICs for specific Namco Vs. System games. I believe nothing else uses them.

user "lupin3rd" has a copy of Vs. RBI Baseball, which is what uses the 127. They did a simple test for me over here.
by lidnariq
Mon May 25, 2020 10:54 pm
Forum: NES Hardware and Flash Equipment
Topic: Famicom Grey Screen (no games running)
Replies: 11
Views: 220

Re: Famicom Grey Screen (no games running)

What version CPU and PPU on are the existing board? As far as I know, you should only need to swap out the CPU - I don't know of any incompatibilities between different revisions of the NTSC CPU and PPU, but you could help us find out if there are any :D
by lidnariq
Mon May 25, 2020 10:44 pm
Forum: NES Hardware and Flash Equipment
Topic: Famicom Grey Screen (no games running)
Replies: 11
Views: 220

Re: Famicom Grey Screen (no games running)

BokuNES wrote:
Mon May 25, 2020 10:43 pm
- the "/RST" pin is high
- the "M2" pin is always high
That's very bad and implies the CPU is broken. Sorry!
by lidnariq
Mon May 25, 2020 10:41 pm
Forum: Newbie Help Center
Topic: Trying to dump my first NES game... :)
Replies: 17
Views: 257

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

Unfortunately, there isn't quite enough information for me to be confident about reverse engineering this board. It might be mapper 62 or mapper 225, or it might be yet another that's similar but different. If you're willing to sit down with a multimeter and measure continuity I can do the rest. (se...
by lidnariq
Mon May 25, 2020 9:40 pm
Forum: NES Hardware and Flash Equipment
Topic: Famicom Grey Screen (no games running)
Replies: 11
Views: 220

Re: Famicom Grey Screen (no games running)

Super cheap 5V logic probe: +5V --- blueLED ---+ +--- 4.7k --- probe gnd --- blueLED ---+ You could replace the blue LEDs with white ones, or two red/orange/yellow ones. If one LED lights, the probe is connected to ground. If the other LED lights, it's connected to +5V. If both LEDs light you've got...
by lidnariq
Mon May 25, 2020 9:27 pm
Forum: SNESdev
Topic: Design guidance for 3D Engine on SuperFX
Replies: 24
Views: 931

Re: Design guidance for 3D Engine on SuperFX

...I'm reading the Wikipedia article on deinterlacing and I can't see anything about filling in the blank lines in a field with interpolated values (anything from linear to CRT scanline emulation), while maintaining the intended position of the lines in each field to avoid bobbing. Has this been tr...
by lidnariq
Mon May 25, 2020 4:07 pm
Forum: Newbie Help Center
Topic: Trying to dump my first NES game... :)
Replies: 17
Views: 257

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

Oh, no, that's to make it searchable for future me. I'm using the photos of the PCBs.
by lidnariq
Mon May 25, 2020 4:06 pm
Forum: Reproduction
Topic: SNES M27C801 2in1 HiRom games - Diagram for Flip-flop 74HC74
Replies: 9
Views: 368

Re: SNES M27C801 2in1 HiRom games - Diagram for Flip-flop 74HC74

paste the second game at the end of first, then save it. Or I use second method with command line, like : copy /B "game1.sfc" + "game2.sfc" two-hirom-games.sfc In this case, where you are combining two 512KiB files to make one 1 MiB file, and placing the result in a 1MB UVEPROM that's 1048576 x 8 b...