Search found 203 matches

by neviksti
Mon Jan 18, 2010 12:24 am
Forum: SNESdev
Topic: What happened with SNES CIC reverse engineering?
Replies: 248
Views: 206623

Thanks for taking the time to write that up. I reverse engineered this all from just the bits in the rom, and a lot of datasheet/patent archeology. Couldn't find the exact cpu fwiw. Did you compare with the Tengen code, ala 'rosetta' style? Otherwise I don't understand how you are gleaning informati...
by neviksti
Sun Jan 17, 2010 3:17 am
Forum: SNESdev
Topic: What happened with SNES CIC reverse engineering?
Replies: 248
Views: 206623

All of this was figured out by segher, one of the few that hangs out on IRC. Did he reproduce this himself by looking at the IC chip, or is this just based on my circuit tracing here (and other circuit tracing comments in other threads)? http://nesdev.com/bbs/viewtopic.php?p=43119#43119 It sounds l...
by neviksti
Mon Nov 23, 2009 3:17 pm
Forum: SNESdev
Topic: Chip decapping/dumping
Replies: 6
Views: 6089

What you described is essentially the 'Rosetta stone' approach which has been discussed before http://nesdev.com/bbs/viewtopic.php?t=5676 It is possible that we already have enough info to do this. So someone who is enjoys crytogram type puzzles, by all means give it a shot. ------ I've accidentally...
by neviksti
Mon Nov 23, 2009 8:30 am
Forum: SNESdev
Topic: Tiles displaced vertically
Replies: 2
Views: 2798

Mode 2 has an "offset per tile" ability.
http://www.neviksti.com/wiki/Hardware_Registers#Mode_2

That's the only thing I know of that can shift things vertically like that.
by neviksti
Mon Nov 23, 2009 4:23 am
Forum: SNESdev
Topic: Chip decapping/dumping
Replies: 6
Views: 6089

That is a different issue. I've already 'dumped' the ROM from the SNES CIC chip myself. But without knowledge of how the CPU works, the rom isn't very useful. And asking a company to reverse engineer an entire cpu core is not something anyone here would be willing to pay for.
by neviksti
Mon Nov 23, 2009 2:42 am
Forum: SNESdev
Topic: Chip decapping/dumping
Replies: 6
Views: 6089

Chip decapping/dumping

Since there has been discussion of decapping/dumping here before (and I'm not sure the best place to ask), I'm hoping someone can give me a good lead. Basically, I am hoping to get the ROM dumped from an LCD controller chip. I've had bad luck finding companies that would do _any_ dumping at reasonab...
by neviksti
Tue Oct 27, 2009 1:10 pm
Forum: SNESdev
Topic: Are CIC's universal?
Replies: 5
Views: 4541

Re: Are CIC's universal?

Can I take the CIC from a PAL cart and just remove the current one on the copier to make it work natively on the PAL snes? Yes, that will work. Often the CIC chip on the copier is socketted just for this purpose. (The game doctors also have spots on the board to jumper it so the CIC signals are tak...
by neviksti
Mon Oct 26, 2009 11:35 pm
Forum: SNESdev
Topic: What happened with SNES CIC reverse engineering?
Replies: 248
Views: 206623

The most important part was the Tengen chip had a debug (?) port that would show the internal status of the processor. No ROM was dumped. The ROM was indeed "dumped", as it could be read easily from the images. (Without it, those Tengen program "disassemblies" would not be possi...
by neviksti
Mon Oct 26, 2009 4:58 pm
Forum: SNESdev
Topic: What happened with SNES CIC reverse engineering?
Replies: 248
Views: 206623

The NES and SNES CIC appear to use the same processor, and only the code was changed. The Tengen "version" of the NES CIC was easier to understand, and a couple dedicated people reverse engineered essentially all the transistor logic on the Tengen chip to figure out what it did... then the...
by neviksti
Mon Sep 21, 2009 3:11 am
Forum: SNESdev
Topic: DSP3/DSP4/ST0XX Reverse Engineering
Replies: 28
Views: 22122

Did you read the links I posted? The questions are answered about the nature of the deal. Even probing equipment being used is mentioned. http://decap.mameworld.info/about-2/ No, I'm sorry I didn't. I saw mameworld and thought the decap page you listed was just this page: http://guru.mameworld.info...
by neviksti
Thu Sep 17, 2009 9:27 am
Forum: SNESdev
Topic: DSP3/DSP4/ST0XX Reverse Engineering
Replies: 28
Views: 22122

TheGuru is secretive about his deal (or at least was last time I tried to ask him about it), so I'm not sure what all we can expect. (Unlike several images of metal layer masked rom he's shown, the DSP1 ROM cannot be read by merely decapping and imaging ... either staining or probing is necessary.) ...
by neviksti
Tue Sep 15, 2009 3:53 am
Forum: SNESdev
Topic: DSP3/DSP4/ST0XX Reverse Engineering
Replies: 28
Views: 22122

I have some side projects that I may be willing to pay for decap and rom reading. How much and where are you going for such services? I never had much luck looking previously.
by neviksti
Tue Sep 01, 2009 12:10 am
Forum: SNESdev
Topic: Theoretical SNES flash cart idea
Replies: 18
Views: 12516

pcmantinker wrote:Neviksti, would your flash cart be able to run your 96mbit Star Ocean hack? That would be amazing. Currently, I am playing it on my SF7.
Yes. My mapper design is not as versatile as the SF7, but it should be able to play that.
by neviksti
Sun Aug 30, 2009 1:42 am
Forum: SNESdev
Topic: Theoretical SNES flash cart idea
Replies: 18
Views: 12516

I'm using PIC24H for the mcu. I needed something large enough and fast enough to handle the SD card okay. Due to unknown and or undocumented issues with the pic chip (I've already found one undocumented bug/"feature") the timing doesn't seem to work as planned for supporting some DSP1 emul...
by neviksti
Fri Aug 28, 2009 5:34 pm
Forum: SNESdev
Topic: Theoretical SNES flash cart idea
Replies: 18
Views: 12516

I'm trying to make a SNES flash cart that can hold multiple games with SD card + (potentially) onboard DSP1 support. My first simplified prototype has run its course and I'm currently ordering prototypes of the full (hopefully final) version. I'm having fun and would like to share my work with other...