Switch screens in SM64DS


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Main - General SM64DS hacking - Switch screens in SM64DS

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schnurbi

Posted on 01-30-16 07:28 AM (rev. 2 of 01-30-16 07:34 AM)

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Hey people!

I just got a broken DS and am making it into a GBA Macro.
(So bottom screen only)

Is there a way to hack the game to display the main gameplay on the bottom screen?
(f.ex. just switch screens)
Or has someone done this already?

Thanks so much!

regards

schnurbi

Platinatic

Posted on 02-04-16 06:45 PM

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it looks cool! but what is the exact point of the project, to run DS games? Or GBA games?
because you can't play SM64DS without the X and Y buttons.

SGC

Posted on 02-07-16 02:35 AM (rev. 2 of 02-07-16 02:36 AM)

Link | #67570

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You don't have to hack it. You can choose what screen you want GBA games to display on in the system settings.

Edit: Never mind I misunderstood the title of the thread.

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Arisotura

Posted on 02-11-16 03:06 AM

Link | #67675

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should be pretty easy, the DS has a register for swapping the top/bottom screens, just find what writes to it and hack that

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Fiachra

Posted on 02-13-16 01:38 PM

Link | #67742

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It's bit 15 at 0x04000304 however this only partially works:

Looks like you'll need to do some additional work to get the various icons working correctly.

For smaller images like the life and star count the method 0x020214A4 is used to draw them; r0 is set to 0x01 for the bottom screen and 0x00 for the top screen. You can find where this method is called from and change the value of r0 passed in or else if you want to swap them all, change the instruction "cmp r0, #0x00" at 020214AC to "cmp r0, #0x01":

For larger images like Mario's face on the bottom screen method 0x02020994 is used, r0 determines the screen as in 0x020214A4. Again, you can either find where this method is called from and modify r0 for each individual call or else change the "cmp r0, #0x00" instruction at 0x0202099C to "cmp r0, #0x01":

Nearly there, there's still that direction arrow on the bottom screen. This is drawn by the method 0x02021024 called at 020DA284. Change the "mov r0, #0x01" instruction at 0x020FA280 to "mov r0, #0x00":

Now you can set bit 15 at 0x04000304 to "0":

Flip bit 15 as needed for menus etc.

Arisotura

Posted on 02-13-16 01:43 PM

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ugh, I didn't think it would be so shitty

maybe Nintendo envisioned a "level on bottom screen" feature like NSMB has?

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Hiccup

Posted on 02-13-16 07:03 PM

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wait. what makes you think they envisioned that?

Arisotura

Posted on 02-13-16 07:17 PM

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read Fiachra's post

basically, the touch screen sprites are set to go on the bottom screen no matter how they're set up

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Hiccup

Posted on 02-13-16 07:58 PM

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I suppose that sort of implies it.

Arisotura

Posted on 02-18-16 09:05 PM

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also schnurbi, is your ...thing based off a DS Lite?

if so, it won't work without some hardware hacking: the DS Lite doesn't start if the top screen is missing/broken

maybe the phat DS does, though, dunno

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Main - General SM64DS hacking - Switch screens in SM64DS

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