nesdev.org

I'm developing yet another NES emulator just because I wanted to code something challenging, as opposed to my day job which is definitely not. It won't be a regular emulator which tries to emulate exactly the original NES and nothing else, it will be, I think, something new and original. No too orig...

I just bought "On the edge" a book about Commodore business machines.
Look at the product number.
Coincidence? or the data entry guy is a retro-nerd sending a message?

ok thanks

Ok, but 21.47 Mhz means that something occurs once every 21,470,000 th of a second. We already stated that that are not PPU cycles, so what are they?

Ok, so the 21.47 Mhz is some sort of video clock signal I shouldn't care about.

Disch wrote:

Petruza wrote: Each CPU cycle equals 12 PPU cycles, CPU runs at 1.79 Mhz and PPU at 21.47 Mhz.

No.

1 NTSC CPU cycle = 3 PPU cycles
1 PAL CPU cycle = 3.2 PPU cycles

I'm confused, so why does the NTSC PPU run at 21.47 Mhz which is 12 times the 1.79 Mhz of the CPU ?

HBlank as used in descriptions of NES hardware is any part of the scanline that is not dots 0-255. But in other descriptions it's time similar to VBlank where writing to the PPU is safe. Of course the NES has no such time between scanlines because it's always busy fetching. So no writes to VRAM can...

The source of timing in my emulator are the instructions that are being executed, so for each CPU cycle executed in its instructions, I advance the PPU renderer ** cycles. That's a slow way to do it, but yeah that's the basic idea. So what would be a better/faster way? I like your idea of master cy...

Source: Brad Taylor's NTSC 2C02 tech ref (This post implies NTSC) I finished the CPU emulation, and heading now towards the PPU. I'm finding the PPU render timing really complex, so I want to know if I understand it at least roughly so I can start to figure out how to implement it. So What I underst...

It would be great to have such a sticky for emulator development.

65024U wrote:Sorry I dragged this so far off topic, I just really want to know how big windows really is and stuff that very moment XD

So....Anyone every think of making a NES cart that could be used for developing games?....FROM THE CONSOLE? *GASP*

Please don't follow the path of Joe_Cracker

Yeah well I think it definently is possible to make a OS Well sure, there were some OSes code in assembler, I don't say it's impossible, I say it's highly impractical as developing any big project in assembler. A 3.2GHZ PC with a OS in assembly? Fastttttt ^_^ :P Linux is coded in C and it's fast, I...

I'm not even gona lie, I think C is evil....especially when people debate what's better, C or assembly, which is too obvious ⌐.⌐ :P :roll: For the domain of this forum which is NES and 6502 Programming, I would agree Assembler is by far the best choice. Hahahah, I ment as in the development of a pr...

Ooops!
Neither the docs nor the example codes had any indirection example, so I guessed ()
Gonna try, thanks!

I've got NesASM 3.01 from here: http://www.nespowerpak.com/nesasm/ Not the .exe since I use MacOS, but built the sources. I'm coding a simple CPU test, and get this errors: 67 00:C02B STX $0,Y Incorrect addressing mode! 105 00:C056 STA ($0,X) Syntax error in expression! Isn't STX ##, Y a valid instr...