krogenth / nes_emu Goto Github PK

Due to the way the NES handles games, each cartridge can have custom hardware, requiring code to handle each new hardware layout. Currently we have coded mappers 0 to 3, with only 0 and 1 having been tested in any capacity. Any cartridge layout which is not currently handled will error out. Thankfully, NesDev gives us details on various hardware layouts, found here.

Current listing of supported hardware layouts can be found here.

Various classes, primarily Cartridge and the Mappers, can potentially throw exceptions. In order to keep the program from exiting prematurely, we need to catch these exceptions, and handle them within the contexts they can happen.

Currently exceptions can be thrown during: cartridge loading, mapper selection, and when the CPU tries to access non-existent parts of the mapper through the cartridge.

We need to add an appveyor.yml file in the repo root directory for ci.appveyor to handle submodules when building.

NES controller emulation is currently hard coded at 1 controller and hard coded to specific key binds. We need to implement a second controller, and allow both to be either keyboard or joypad. If possible, use a configuration file to read what key maps to what input.

According to the instr_test_v5 suit, all tests should store the results at 0x6000, but results end up being output at 0x0700. Testing with official_only.nes and all_instrs.nes, both of which use Mapper001, output to the same section.

This is most likely a bug in how the windowing is performed.

Direct link to test suit: instr_test_v5

Currently, the PPU_Implementation branch can draw foreground sprites perfectly fine, however, the background sprites are not, as seen here: