Search found 10995 matches

by lidnariq
Tue Sep 27, 2022 7:34 pm
Forum: NES Hardware and Flash Equipment
Topic: Help collecting pictures of CPU and PPU packages
Replies: 48
Views: 2085

Re: Help collecting pictures of CPU and PPU packages

Here's a very simple test for the periodic noise sounds. It just endlessly plays pairs of notes: first the noise channel, then a square wave that should be almost the same pitch, then silence. The first sixteen pairs are the NTSC table, the next sixteen pairs are the PAL table. If the first sound mo...
by lidnariq
Tue Sep 27, 2022 6:10 pm
Forum: NES Hardware and Flash Equipment
Topic: Help collecting pictures of CPU and PPU packages
Replies: 48
Views: 2085

Re: Help collecting pictures of CPU and PPU packages

I just tested this and I can confirm that both of my RC2C03B chips do NOT exhibit the supposed "wrong" colors. [...] Perhaps the "wrong color" anomaly is limited only to specific lot numbers? Or maybe the specific PPU that Kevtris analyzed there was just defective for some other...
by lidnariq
Tue Sep 27, 2022 3:21 pm
Forum: NES Hardware and Flash Equipment
Topic: Help collecting pictures of CPU and PPU packages
Replies: 48
Views: 2085

Re: Help collecting pictures of CPU and PPU packages

The only significant difference left is the tuning tables, so... yeah. I guess the other little question is: what does pin 30 do? On the 2A03G and H it enables APU test registers, and on the 2A03E we believe it's /RDY. Some of the later famiclones use it to switch between dividers, so there's lots o...
by lidnariq
Tue Sep 27, 2022 3:16 pm
Forum: NES Hardware and Flash Equipment
Topic: Help collecting pictures of CPU and PPU packages
Replies: 48
Views: 2085

Re: Help collecting pictures of CPU and PPU packages

I wonder if the ÷16 chips are using the 2A07 APU pitch tables for the noise and DPCM rates (nevermind which have a functioning DPCM reader...) or if they're all using the 2A03 APU pitch table.

Thank you for all of this data!
by lidnariq
Tue Sep 27, 2022 10:39 am
Forum: NES Hardware and Flash Equipment
Topic: Help collecting pictures of CPU and PPU packages
Replies: 48
Views: 2085

Re: Help collecting pictures of CPU and PPU packages

Okay, just to complicate the UA6527P situation a little more, I discovered and tested a couple of these puppies today: [image of DIP40 with: UMC UA6527P 9032 626420] And... they have a /16 clock divider! They are marked with white ink and somewhat worn, so they don't appear to have been re-marked. ...
by lidnariq
Tue Sep 27, 2022 10:36 am
Forum: NES Hardware and Flash Equipment
Topic: Mystery regarding UA6528 lot numbers
Replies: 5
Views: 360

Re: Mystery regarding UA6528 lot numbers

Is there any consistency at all across a group of broken PPUs?
by lidnariq
Mon Sep 26, 2022 11:22 am
Forum: Other Retro Dev
Topic: Please, help me understand this Atari 2600 cartridge switch
Replies: 1
Views: 216

Re: Please, help me understand this Atari 2600 cartridge switch

Although I successfully rebuilt the same circuit, so I can confirm I draw it correctly, I just can't understand how it works. Is the IC receiving current through the clock pin, how? :roll: Yup! Because CMOS parts are so static sensitive, they often will have diodes as possible to reduce the possibi...
by lidnariq
Mon Sep 26, 2022 11:13 am
Forum: NES Hardware and Flash Equipment
Topic: Help collecting pictures of CPU and PPU packages
Replies: 48
Views: 2085

Re: Help collecting pictures of CPU and PPU packages

loglow wrote: Sat Sep 24, 2022 9:11 pm A photo of an RC2C03B chip (code 4A4 30). Tested and working RGB PPU.
The RC2C03B is the one that theoretically has the slightly-wrong palette. Have you noticed this when you were using it?
by lidnariq
Sun Sep 25, 2022 6:47 pm
Forum: NES Hardware and Flash Equipment
Topic: Kazzo USB rom dumper / dev cart programmer
Replies: 721
Views: 461880

Re: Kazzo USB rom dumper / dev cart programmer

The problem with trying to dump it as BNROM is that BNROM itself only cares about the data bus, not the address bus, and that dumping script doesn't change the address bus. (Which is why the original script I gave you did. That 128KiB you got should be a good dump, I just don't know if it's already ...
by lidnariq
Sun Sep 25, 2022 2:26 pm
Forum: NES Hardware and Flash Equipment
Topic: Kazzo USB rom dumper / dev cart programmer
Replies: 721
Views: 461880

Re: Kazzo USB rom dumper / dev cart programmer

This board is likely not actually mapper 61 - mapper 61 can configure nametable arrangement at runtime, but here it's fixed. I didn't see anything that obviously was this board. Depending on the exact addresses used by the game, it might work as mapper 34 or 241. It might also work as mapper 201, UN...
by lidnariq
Sun Sep 25, 2022 10:32 am
Forum: NES Hardware and Flash Equipment
Topic: Help collecting pictures of CPU and PPU packages
Replies: 48
Views: 2085

Re: Help collecting pictures of CPU and PPU packages

Arbitrarily, I was assuming the pictures of heatspreaders weren't useful, but I'm open to arguments that they are worth including.
by lidnariq
Sat Sep 24, 2022 12:35 pm
Forum: NES Hardware and Flash Equipment
Topic: Help collecting pictures of CPU and PPU packages
Replies: 48
Views: 2085

Re: Help collecting pictures of CPU and PPU packages

I guess the "GT-01" is the ROM for the built-in multicart?
by lidnariq
Sat Sep 24, 2022 12:32 pm
Forum: NES Hardware and Flash Equipment
Topic: Kazzo USB rom dumper / dev cart programmer
Replies: 721
Views: 461880

Re: Kazzo USB rom dumper / dev cart programmer

From my experiments with trying to dump it using the Kazzo Firmware an anago and the updated INLretro Firmware software I think it has CHR-RAM and not CHR-ROM. But I don't really know. Yes, it has CHR RAM - hence the part labelled GM76C88AL All my dumps come out with 512kb PRG Should have 128KiB - ...
by lidnariq
Fri Sep 23, 2022 6:15 pm
Forum: SNESdev
Topic: Help dumping a SNES indie cart
Replies: 7
Views: 517

Re: Help dumping a SNES indie cart

It would help to know if anything's on the other side.

When you dumped it, it only gave you 256KiB? That's a 4MiB 'PROM, and it could be checking for stuff beyond the lowest 256KiB of your dump. (Can you tell the retrode to try to dump more than just 256 KiB?)