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by lidnariq
Sun May 30, 2021 12:57 pm
Forum: Other Retro Dev
Topic: 3DS reverse engineering
Replies: 320
Views: 262694

Re: 3DS reverse engineering

GBA's LCD is already too fast for any blurring in that effect. I posted an animated GIF (1/60th real speed) of the flashing column of light in Castlevania: Circle of the Moon in this post Hmm, ok. That is pretty much impossible to simulate with the 3DS LCDs. They can only do 60 Hz so we can't split...
by lidnariq
Sat May 29, 2021 8:59 pm
Forum: NESemdev
Topic: Cheap Highpass Filter? (just add/subtract and bitshifts)
Replies: 7
Views: 1117

Re: Cheap Highpass Filter? (just add/subtract and bitshifts)

You could do a really lazy first-order IIR highpass with something like out[n] = out[n-1]*(1024-1) + in[n]/1024 that's a lowpass, one second while I do more math Oh, man, it's been waaaay too long since I last remembered this. Simple IIR highpass: out[n] = out[n-1]*(1024-1)/1024 + in[n] - in[n-1] En...
by lidnariq
Sat May 29, 2021 7:30 pm
Forum: NESemdev
Topic: Cheap Highpass Filter? (just add/subtract and bitshifts)
Replies: 7
Views: 1117

Re: Cheap Highpass Filter? (just add/subtract and bitshifts)

All digital filter design is relative to the sample rate, so I'd need more details before I could construct something similar to whatever you're thinking of...
by lidnariq
Sat May 29, 2021 3:54 pm
Forum: Other Retro Dev
Topic: 3DS reverse engineering
Replies: 320
Views: 262694

Re: 3DS reverse engineering

Are you referring to rapidly flickering graphics? The pixel response time of the old LCD displays is really shitty which many games abused to create transparency effects by flickering sprites/tiles rapidly. This doesn't work anymore on modern LCDs because they are too fast. GBA's LCD is already too...
by lidnariq
Sat May 29, 2021 10:36 am
Forum: NES Hardware and Flash Equipment
Topic: Sprite multiplexing on PAL - wiki incorrect?
Replies: 2
Views: 710

Re: Sprite multiplexing on PAL - wiki incorrect?

Sorry, we discovered that's wrong but I failed to update the wiki because I have no idea what's right anymore.

Sour started a thread four years ago: viewtopic.php?t=15763 but I had no idea how to summarize the results.
by lidnariq
Fri May 28, 2021 8:11 pm
Forum: NESemdev
Topic: mapper 97?
Replies: 4
Views: 807

Re: mapper 97?

aquasnake wrote:
Fri May 28, 2021 8:07 pm
Merge to maximize expansion:)
Absolutely no valid reason to do that. There's only one game that's mapper 97, and Disch's old documentation is an arbitrary superset.
by lidnariq
Fri May 28, 2021 3:32 pm
Forum: General Stuff
Topic: Becoming an FPGA Engineer
Replies: 48
Views: 6179

Re: Becoming an FPGA Engineer

That's surprisingly nice plywood :P
by lidnariq
Fri May 28, 2021 12:52 pm
Forum: NESdev
Topic: MMC3 on FPGA?
Replies: 8
Views: 931

Re: MMC3 on FPGA?

What you see there is almost certainly the COOLBOY or MINDKIDS MMC3 clones "SMD132" or "SMD133", instead of programmable logic.
by lidnariq
Fri May 28, 2021 12:50 pm
Forum: NESdev
Topic: NES dev on retro pc
Replies: 20
Views: 2315

Re: NES dev on retro pc

There was a recent article on hackaday about doing nesdev on the Apple ][e: https://hackaday.com/2021/05/20/what-ne ... -apple-ii/
I mean, really, TylerBarnes posted a video, but the article is better :)
by lidnariq
Wed May 26, 2021 4:48 pm
Forum: General Stuff
Topic: Becoming an FPGA Engineer
Replies: 48
Views: 6179

Re: Becoming an FPGA Engineer

Are you saying I should be OK to set /OE to 0 and control DIR with just PPU /RD and swap sides for everything like this: It's a little uncomfortable because of propagation delay, but ... I find it credible? On the other hand, I think your original design was fine too, and doesn't obviously have pro...
by lidnariq
Wed May 26, 2021 3:51 pm
Forum: Reproduction
Topic: Open Hardware SNES Repro PCB with FeRAM support
Replies: 49
Views: 21799

Re: Open Hardware SNES Repro PCB with FeRAM support

Note that memories with "V" in the part number are 3.3V devices: they will be damaged by being operated at 5V, and will damage 5V parts if they are operated at 3.3V without voltage translation.
by lidnariq
Wed May 26, 2021 12:20 pm
Forum: General Stuff
Topic: Becoming an FPGA Engineer
Replies: 48
Views: 6179

Re: Becoming an FPGA Engineer

Does this look correct for using 74LVC245 level shifting bus transceivers: Looks right? I am wondering if the AND gate for /OE is correct on the right/center chip for the PPU data bus. (I don't think I have to do anything like that on the CPU data bus.) It's not wrong to say that the PPU's data bus...
by lidnariq
Tue May 25, 2021 5:46 pm
Forum: NESdev
Topic: (NOOB) good MMC chip explanations/tutorials?
Replies: 31
Views: 10069

Re: (NOOB) good MMC chip explanations/tutorials?

You mean the bugged sprite overflow flag in $2002? It's only buggy if there might be 8 sprites on one scanline. (It's the process of finding out if there would have been a 9th sprite that's buggy) If you guaranteeably have 7 or fewer sprites on a scanline it's fine. If you have 9 (or more) sprites ...