Useful links

To help you figure out where you can find which information we have provided a list of links together with the subjects they are useful for. You are of course free to use other sources of information as well.

Instructions

• https://www.masswerk.at/6502/6502_instruction_set.html
• http://www.6502.org/tutorials/6502opcodes.html

CPU registers

• https://www.nesdev.org/wiki/CPU_registers

Addressing Modes

• https://www.nesdev.org/wiki/CPU_addressing_modes

General overview of the 6502:

• https://www.middle-engine.com/blog/posts/2020/06/23/programming-the-nes-the-6502-in-detail

Video explaining memory mirroring:

• https://www.youtube.com/watch?v=PvfhANgLrm4

Initial cpu state:

• https://www.nesdev.org/wiki/CPU_power_up_state

Weirdness of BRK:

• http://forum.6502.org/viewtopic.php?t=1917

Mappers:

• NROM (easy to get started with)
• MMC1

Rom file header:

• https://bheisler.github.io/post/nes-rom-parser-with-nom/
• https://www.nesdev.org/wiki/INES

Interrupts

• https://www.nesdev.org/wiki/CPU_interrupts

CPU Memory map

• https://www.nesdev.org/wiki/CPU_memory_map

Unofficial Instructions Information

• No More Secrets

Gamepak information

• https://nescartdb.com/search (can be used to find games that use a certain mapper)

Test Roms

• https://github.com/christopherpow/nes-test-roms/