nesdev.org

A NES cart case with a 3D printer ? Interesting concept. However I'd be afraid it would be very fragile (3D printed objects are basically some sand grains glued together). That being said 3D printers will probably be THE best invention of the 21th century. I'm looking forward for when they'll be af...

Good call Farid, HxD is what I was looking for. Unfortunately I'm still confused. Last night I burned a new set of '256 eproms with the original bin images and installed them in my socketed NROM devCart. They showed the same sort of errors. Then I split the .nes again with the PHP readNES again and ...

OK I'll load up FCEUX, only been using Nestopia but it doesn't seem to debug. Just hoping that there was a byte-for-byte compare tool, seems like I used one a long time ago. I'm thinking a bad EPROM also; what bakes my head is the Williem verified it. Maybe the chip failed after programming during t...

So I think I already know the answer, but I'll put this out anyway, to get more insight. Over the weekend, I burned a NROM to eproms and my Willem verified them as good; used 27c256s for both (4xCHR bin). Then I tested them on my socketed cart and the program seemed to work, but thinking back I was ...

@Lugia2009
Just based on the cart edge, the chips on the right are the PGM roms The chips on the left all end with '64' part #s, so willing to bet they are 8Ks.
Just a guess without google'n
Yogi

One thing that would be neat, but definitely wants the original source to work with, would be making a CHRless version. What's nice about that is that you don't need to replace the CHR (only remove/disable it); instead it just cleverly repurposes the memory provided by the NES itself, because the g...

@ lidnariq Thanks for the patched .nes! Works great! 8x padded to a 27c010, popped it in my SNROM devCart and 'tested' for hours! \o/ The SNROM patch is the easiest route for a cajoNES+ cart. Although I intend to finish the (S)NROM cart mod I started, it makes far more sense to patch the code or jus...

That's cool! I hope you (you are GameMasterZX100 ?) share some info on your project at some point. So Cool.
Yogi

I'm assuming that /R and /W are exclusives. /R*/A13=CHR rom Selected with W*/A13*(A12:A0=any state) Just the same as the 8051, yes. Yes; it's been quite a few years since I messed with them :) 12 clocks per instruction cycle, those were the days. With your permission, I'd like to pass your port alo...

Yes. After comparing the SNROM's CHR Ram footprint to a RetroPak with NROM configured, I'm sure that a 27c256 should drop-in with only one question mark: Pin 27, A14 on the rom and /W on the ram. The retroPak pulls this high whereas the SNROM cart connects it to CHR /W. So in this case, I think /W ...

Hi tepples Go ahead and use the two 27C256s. You might consider using an SJROM or SKROM donor instead. An SNROM donor may work as well; Morita Shogi , for instance, uses it with an 8K CHR ROM. Yes. After comparing the SNROM's CHR Ram footprint to a RetroPak with NROM configured, I'm sure that a 27c2...

I'm not even certain about that. RAMs and ROMs seem to be pretty comparable in cost. The big thing is that RAMs can dynamically update their contents, such as done by Color A Dinosaur or (most impressively) by Elite. On the other hand, ROMs can be told to change what's drawn on screen much more rap...

Sorry, my mistake for leaving too much implicit. The NES has two entirely disjoint memory spaces: the CPU's and PPU's. The iNES dump format (.nes) stores the PRG ROM as a multiple of 16 KiB. When I looked at the actual data Neil provided, the first 16 KiB and final 10 KiB were almost all padding. S...

I just looked inside the cajoNES(and +) ROM: it's actually only about 6KiB in size; almost all program. You could just program it onto an 8KiB PRG ROM. Similarly there's only 2KiB of CHR, although it'd require a little work to compress it below 4KiB. When you say "... compress it below 4KiB.&q...

Doh! I'm such a noob! I had looked at the iNES header earlier, but didn't pay attention to the Mirroring. Nestopia shows Horz mirroring checked, so an NROM cart would have Vert bridged, yes?
Yogi