Posted by never-obsolete

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What you want to do is find out how the game buffers its vram updates and write all your data to the buffer. Then let the game take care of writing to vram on the next vblank.

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Graphics updates



19 : VRAM Buffer - Write Flag (if != 0, then write VRAM Buffer to VRAM)



1A : VRAM Buffer - Write Flag (Vertical NameTable Updates) (if != 0, then write VRAM Buffer to VRAM, NameTable writes are done in Vertical direction. )



58-59 : Graphics being loaded - Dest. VRAM Address Pointer



9A : VRAM update suspend flag. Used to synchronize sprite DMA updates and VRAM updates.



780-7FE : VRAM Buffer.

  (Used to write to Name Table VRAM, either when

   screen is off or in NMI when screen is on.)

  Format:

    The buffer is divided in chunks of strings.

    If the first byte in the chunk is $80 or more (usually $FF),

    it means to stop reading chunks from the buffer.

    Format of string chunk:

      byte 0: PPU VRAM Address High (if >= $80, stop reading buffer)

      byte 1: PPU VRAM Address Low

      byte 2: Number of Letters/Bytes to write (minus 1; if

        the value is 0, it means to write 1 tile, if value is 1,

        it means to write 2 tiles, and so on..)

      From byte 3 follows the variable-length string of bytes to write

      in sequence, (length is the value of [Byte 2] + 1)

      This is the end of the string chunk.

  Format, explained by interpretion in C code style: {

    unsigned char a, x, y;

    unsigned char vram_hi, vram_lo;

    x = 0;

   loop:

    a = *(0x780 + x);

    if ((a & 0x80) == 0x80) { return (0); }

    vram_hi = a;

    a = *(0x781 + x);

    vram_lo = a;

    y = *(0x782 + x);

    for ( ; y >= 0; y--) {

      a = *(0x783 + x);

      NES_PPU_VRAM[(vram_hi << 8) | vram_lo] = a;

      x++;

    }

    x += 3;

    goto loop;

  }

; Code to copy and shift a single PPU tile.  In this case, PPU tile $48.



; Turn  screen off

	LDA $16

	STA $2001

	

; Select PPU tile $48

	LDA $04

	STA $2006

	LDA $80

	STA $2006



; Write to $2007 sixteen times to copy all of tile $48

	LDY $10

Read:

	STA $2007

	DEY

	BNE Read



; Increase tile Y position and write pixels

	LDY $0F

	LDA $04

	STA $2006

	LDX $81

	STX $2006

Write:

	LDA $04

	STA $2006

	STX $2006

	STA $2007

	INX

	DEY

	BNE Write



; Restore scanlines

	LDA $20

	STA $2006

	LDA $00

	STA $2006



; Turn screen back on

	LDA $1E

	STA $2001



; Return from sub-routine

	RTS

Posted by Dr. Hell

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I can't believe that there aren't any threads about this yet. From what I have read, the 3D effect is amazing, though you have to be positioned in a "sweet spot" in order for it to work. The good news is that if you're sitting in a position where said sweet spot is impossible, there's a 3D slider which will allow you to shut it off.

Other improvements over the DS/DSi line are Gamecube (maybe even better) quality graphics, along with an analog "slider" (It's a disk that you slide around instead of a joystick). There's a digital movie download service in the works. Also it boasts the ability to take 3D photographs.

Some of the games that were on the e3 floor to demonstrate are, but are not limited to:
Kid Icarus: Uprising
Ocarina of Time 3D
Mario Kart 3D
Star Fox 64 3D
Animal Crossing
Tom Clancy's Splinter Cell: Chaos Theory
Nintendogs +Cats
Riiiiiidge Raaaaacer
Metal Gear Solid: Snake Eater 3D

Also, this is really rough, and probably nowhere near as awesome as how the 3DS looks, but I took a screen from Kid Icarus: Uprising and turned it into one of those "cross eye" 3D images, in order to get a taste of what's to come. (It is totally easier to look at if you open it in a new window or tab.)



See trailers and a full list of the demo games here: http://e3.nintendo.com/

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Posted by Mineyl

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Nothing terribly special. Just me screwing around with the original Legend of Zelda.

At least it's not Mario or Megaman, right? xD

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Posted by Nikolaj

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Some screenshots would be appreciated...

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Posted by Ice Penguin

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Posted by RetroRain

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Cool. You working on a new hack?

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Yeah. I played the original Zelda II recently and got an idea for a hack.

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