nesdev.org

Dwedit wrote:I wonder if anyone ever made a 32-bit 6502?

The "Terbium": http://forum.6502.org/viewtopic.php?t=785

What happened to the thread topic?

When I posted it the topic was "Where to get donor carts". Somehow it has changed to "Where to get donor carts: Bathing in SMB/DH", yet the thread history shows no change history.

What kind of GNROM games are you going to put on those glob tops anyway? That's not me in the photo!!!! I have no use for those carts. Just saw the entry in my RSS reader and realized that to most people that huge collection or carts woudl be junk, but to nesdevers they are a source of cases and po...

Donor carts wasted: http://bobshouseofvideogames.com/2010/09/23/funny-video-game-photos-the-scrooge-mcduck-of-mario/ and best cake ever: http://bobshouseofvideogames.com/2010/09/24/funny-video-game-photos-delicious-qbert/ Its friday, after lunch, and I'm totally unable to focus on work stuff. :( I'm...

The blog over at "pagetable.com" has a few recent articles about the 6502 that might interest some of you. http://www.pagetable.com/?p=410 Internals of BRK/IRQ/NMI/RESET http://www.pagetable.com/?p=406 Measuring the ROR Bug in the Early MOS 6502 http://www.pagetable.com/?p=401 Measuring th...

Would it be worth caching the two values to be written into A and Y, and then writing them back-to-back. You'll still have a race condition, but it will be down to 3 clock cycles instead of however many you currently have (8?).

ie..

lda something, X
tay
lda other, X
sta APU_a
sty APU_b

I would not say that Crystalis did not use any compression. Just that they did not use RLE for converting areas to meta-tiles. This is all that I have left of my Crystalis hacking tools. I had posted them to Zophar's domain years ago, but they garnered little interest. The C code compiles into sever...

Crystalis used a different approach. If you have played the game then you will notice that many areas have identical looking "screens" (even though the game implements 8-way scrolling). The game world is composed of 100+ disjoint "areas". Special areas on each map are "warps...

Today while wandering around on the intertubes, I found an Atari 7800 equivalent of Blargg's project:

http://home.arcor.de/estolberg/tools/index.html

Top two items: "Atari VCS 7800 development system"

I want to have 8-way background scrolling. I'm willing to live with scroll artifacts on the edges if I must, but like most people, would prefer to avoid them. Scrolling glitches are 100% avoidable in two cases: You have an IRQ counter. In this case, use vertical mirroring and use a scanline IRQ to ...

I am after the same, but for MMC1. usb copynes + powerpak lite, done I would prefer to not dissemble my NES and extract the CPU. I've read the threads about alternate mappers that Tepples point out. I'm all for a new mapper. I don't need a strictly conforming MMC1, MMC3 or FME7. One thing that I do...

[Soon to be split from this post ] I am after a devcart that doesn't need chip swapping for each build, but for MMC1. Well, I would love to switch to MMC3, but retrousb doesn't sell MMC3 carts for fabrication. (Someone once mentioned that the required number of gates in a PLC for MMC3 exceeded what...

http://wiki.nesdev.com/w/index.php/CHR-ROM_vs_CHR-RAM Under last paragraph of "applications": Super Mario Bros. keeps its title screen map data at the end of CHR ROM and copies it into PRG ROM to draw it. Should it be "copies it into PRG RAM to draw [from] it"? I lack the ability...

I contend that a "NES" file and an "ISO" file are quire different. The NES is a program (with data) meant to be executed. The ISO is a mountable file system. The ISO is not different from files stored on your hard-drive. I think that the crux of the issue with NES files and the G...

http://www.gnu.org/licenses/gpl-faq.html#MereAggregation , paragraph #3. I contend that a NES game (image or physical cart) that includes GPL "stuff" (any GPL source ultimately linked into the NES image) counts as "the same executable file" and not as "aggregate". Cons...