Tuesday , March 2 2021

spieglt / nestur, Hacker News


                    

        

This is an NES emulator and a work in progress. The CPU and PPU work, though there are still at least a couple bugs. I’ve mostly tested on Donkey Kong and Super Mario Bros. so far. There are plenty of full-featured emulators out there; This is primarily an educational project but I do want it to run well.

  • One dependency (SDL)

  • One line ofunsafe(std :: mem: : transmute ::() ->i8)

  • NTSC timing

)

(Warning: this pipe currently takes you to an empty room, it’s not the only one, and I don’t know why.)

************************************** Controls:

Button **** Key ___________________ | A | D | | B | F | | Start | Enter | | Select | R-Shift | | Up | Up | | Down | Down | | Left | Left | | Right | Right | -------------------

The code aims to follow the explanations from

https: // wiki. nesdev.com/w/index.php/NES_reference_guidewhere possible, especially in the PPU, and the comments quote from it often.

Thanks to Michael Fogleman's

https://github.com/fogleman / nesfor getting me unstuck at several points.

To do:

  • More mappers (only NROM / mapper 0 implemented so far)

  • DMC audio channel, high- and low-pass filters, APU cleanup / timing fix

  • Save / load functionality and battery-backed RAM solution

  • Player 2 controller?

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