save files for games

[Gabbajoe]

Hi,

with your bootloader you flash every time the game new so not high scours or for gameboy games save files are working. Do you plant to implement such a feature that the high score or the gameboy save files will get read and store on the sd card?

Cheers, Gabba

[tvecera]

Thank you for your feedback. If time permits, I intend to enhance the emulator further. Specifically, the current version of Peanut GB fails several Blargg and Mooneye tests. While this is often not an issue for GB games, inaccurate timing is problematic for GBC games operating in double speed mode. I'm currently awaiting approval and completion of a pull request that would add GBC support to Peanut GB. Once that's done, I'd like to address the issues observed in some GBC games. I have tested several games and summarized the results below:

Working Games:

• Super Mario Bros. Deluxe (V1.1)
• The Legend of Zelda - Oracle of Ages
• The Legend of Zelda - Link's Awakening DX (V1.2)
• The Simpsons - Night of the Living Treehouse of Horror
• Prince of Persia
• Pokemon Pinball
• Heroes of Might and Magic II
• Duke Nukem
• Asterix - Search for Dogmatix
• Gameboy Color Promotional Demo

Non-working Games:

• Worms Armageddon: The game gets stuck on this line:

      if(!(gb->hram_io[IO_LCDC] & LCDC_ENABLE)) 
      continue;

  Commenting out this code allows the game to function properly.

• Spider-Man (USA, Europe): The game crashes due to invalid opcodes: 0xF4, 0xFC, 0xFD, 0xE3, 0xE4, 0xEC, 0xED. Ignoring these invalid opcodes results in the game eventually freezing.

Going forward, my plans include:

• Sound: This remains a challenge. Even after resampling, the current buzzer cannot replicate the gameboy's sound accurately. I plan to test an external MAX98357A or PCM5100A connected to the picopad to see if this issue can be resolved using an external module.
• Game State Saving: I want to implement saving the game state to the SD card when you finish a game (upon pressing Y). When the game restarts, it would then load the state from the SD card.
• Display Optimization: I'm currently facing an issue related to SPI speed. When the display spans across the screen, it's necessary to skip every other frame to allow the screen to redraw.
• ROM Loading: I'm considering loading the ROM directly from the SD card.

[Gabbajoe]

Hi tvecera,

I modified your gameboy implementation for some game to not exit into the bootlaoder with the Y key because you need the select key. I was not able to implement a "key combo like button left + Y pressed to exit in the bootloader.

I test so far the games working: The Simpsons - Escape from Camp Deadly Game & Watch Gallery 2 Kwirk - Here I disabled the Y button to exit to the bootloader Super Mario Land Supper Mario Land 2 - but the picture/frames are not smooth. Here I disabled the Y button to exit to the bootloader Tetris Pokemon Pinball - seems sometimes with fast movements, lower to uper flipper change, the pictures lags a bit.

[tvecera]

I've pushed a new version with changed key mappings:

Gameboy	Picopad
RIGHT	RIGHT
UP	UP
LEFT	LEFT
DOWN	DOWN
A	A
B	B
START	X
SELECT	Y
QUIT	A + B

[Gabbajoe]

I've pushed a new version with changed key mappings: Gameboy Picopad RIGHT RIGHT UP UP LEFT LEFT DOWN DOWN A A B B START X SELECT Y QUIT A + B

nice , i c how do did the 2 button action. I change it to x +y as in some games you need to press a + b :)

[tvecera]

You can find the check at the end of the main.cpp file:

        } while (!(gbContext.direct.joypad_bits.a == 0 && gbContext.direct.joypad_bits.b == 0));

[Gabbajoe]

Yeah I know I changed it to:

 } while (!(gbContext.direct.joypad_bits.start == 0 && gbContext.direct.joypad_bits.select == 0));

As in some game you press a nd b at the same time. :)