nesdev.org

You need to disable background and sprite rendering before writing the second background to the PPU then re enable them afterwards bits 3 and 4 of $2001. The PPU can't be written to while it is rendering, it produces unstable writes, only while rendering is disabled or while you're in vblank or hbla...

If I understand what you are doing, adding two 8.8 fixed point variables together is the same as adding any two 16-bit variables. The increment instruction does not need to be used. This the necessary code. lda OBJLOX,x ;add low byte of horizontal velocity to low byte of X coordinate clc adc OBJLOH,...

Looking at the error it is sayin that the first line of the PRGMain.asm file is something the assembler doesn't understand. What is on the first line of that file?

You need to put double quotes around the name of the file.
.include "PRGMain.asm"
Like that.

Because the register that holds the PPU address is used internally by the PPU when rendering, so the value becomes unstable. This is true even for writing to VRAM that is not being used in the current display. As far as the number of bytes to write to the PPU, since you can only do that in Vblank wh...

If you don't already have it, download FCEUX this emulator has good debugging features. You can view the all of RAM by going into Debug > Hex Editor.

The reason why I ask all this is because when I do my sound engine, I'll try to do it as simple as possible while the sounds still sound good and not monotonous. In a good sounding music engine there is usually a way to control the volume and pitch of a note over the duration of it being played. If...

I'm fairly sure Final Fantasy doesn't use the noise channel in any of its songs. The sound effects use the noise channel and one of the square channels when necessary. Final Fantasy 2 might be the same way now that I think about it.

Alright I have fixed what I needed to fix and here it is.

There are a few things I need to fix on it to make it more user friendly. Once that's done ill post it.

I disassemble gameboy games by writing an emulator with a code/data logger and then write a gbz80 disassembler to take that cdl data and create a disassembled text file.

Funny enough, I programmed my own fictional 8 bit console that I called Arcadia (at the time not knowing Emerson beat me to the name). Envisioned to be a system that could have come out in the mid 1980s. It has similar specs to what Tsutarja proposed, I even ported SMB to it as a proof of concept. C...

I just thought of a way to do a fullscreen illusion without any sprites. Instead of using vertical bars, try horizontal bars created by turning off and on the display at regular intervals with interrupts or timed code.

Unfortunately there doesn't seem to be much in the way of a comprehensive tutorial for cc65. If you already have a good knowledge of C, then you just have to learn the compiler's specific syntax which can be found at the cc65 website. As far as the NES specific stuff, there are plenty of tutorials (...

In order to save data in an NES game you need to set bit 1 of byte 6 in the header of your ROM. Doing so enables 8k of expanded RAM at $6000-$7FFF to be saved to a file when the emulator closes and is restored when you open it up with that ROM.