nesdev.org

Wouldn't this constitute copyright infringement? Note that Atari got sued because the code in the Rabbit infringed on the copyrights on the 10NES code and not the patents. See 975 F.2d 832 (Fed. Cir. 1992).

Note: Those who don't know how NTSC or PAL work might not understand what I'm talking about. The rest of you, read on. You know how on a TV displaying a composite signal, if there's a thin vertical stripey patten you get a rainbow? That's because the signal being displayed exceeds the bandwidth of t...

What mapper does this game use, so that I can tell exactly how much effort needed to go into the background warping effect? Does it have PRG RAM? Nestopia says it's Mapper 4, which means it uses either a MMC3 or a MMC6. It also says it has 128k of PRG-ROM and 128k of CHR-ROM. Does anyone have info ...

Okay, I was resetting the scroll before the unrolled loop. So I moved it to the end of the loop, and the scroll is where I want it. Now all that's left is the line rendering and input. Updated file available here.

Okay, I got it working (sort of). I added all of the <s to all of the zero page locations (including the VBlank rendering), the nametable is set up right, and it compiles. But, the scrolling is off (even though I set it to #$00 every frame) and only two pixels of the line are rendered. It behaves th...

Number 1 is okay, I can just run the program as PAL until I put in the ZPs necessary. 240 ZPs... woohoo what fun! But what's causing number 2, I wonder? Stupid assembler? I'd use CA65 - I just don't know how to set it up for NES programming. And I hear the file needed to do it doesn't work right or ...

Okay, file updated! See my above post.

I started work on what I call the "vector demo." It's a program that draws a line in a 6 by 5 tile box (48 by 40 pixels) in CHR-RAM. The line can be moved around with the d-pad, and can only go down and right on a slope less than 1 (for now). The only problem is, I get a grey screen of not...

Or else there's this.... randomtbl: .db $33,$f2,$06,$11,$c4,$50 Yeah, but then you can end up with "Pac-Man pattern" effects. If you want to be really random, have an ADC read a floating pin. It could get expensive if you want more than 12 bits from the ADC, and you wouldn't be able to do...

I was reading On the Edge: the Spectacular Rise and Fall of Commodore the other day, and I noticed something interesting: [In 1986,] Commodore management began to consider options to compete against Nintendo. . . Robert Russell investigated the NES, along with one of the original 6502 engineers, Wil...

Oh yeah, I forgot I was using $00 and $01 for the name table loading. So, I just changed the locations of my variables, and it works! Thanks Quietust! Okay, now there's other things I'd like to know. 1) How long is the time, in CPU cycles, between the end of rendering one scanline and the start of r...

So, has anyone tried it? How did it run for you?

Here's the source with bug fixes and the compiled file. The only thing is, it delays for 2 seconds (I counted about 120 frames in Nintendulator' frame stepper), moves right one pixel, then starts scrolling left. What's causing that? Oh, and I have some extra stuff in the source (like everything und...

Here's the full source code. GeoCities wouldn't let me upload any .nes, .chr, or .nam files, because they had "invalid filenames." You could use any 8k .chr and 1k .nam with that source, assemble it through NESASM, and get the same results I'm getting.

Okay, I'll upload the ROM. But where can I get free file hosting without spam? As for "right" being "wrong," I made the nametable using NSA, and it shows up there the same way it shows up when the screen is not scrolled. But whenever I scroll the screen, it suddenly jumps. And fo...