Super Mario 64 Star Road, Christmas Carnival & Missing Stars

Nerd42 · **Joined:** Mon Nov 17, 2008 9:55 am **Posts:** 62

Salv-E wrote:

I already said that is not a bug in the emulator, there's nothing to fix in our side

But you did fix it, at least for this version of the emulator with that modified eboot.

Salv-E wrote:

and we won't add any unnecessary option which will slow down the core.

Adding a flag variable for whether to check whether to check the rom for this would be an operation done in constant time (it's just a bool!) and therefore could not slow down the core if it's turned off by the user.

Quote:

I already explained what is needed to modify in the emulator to play those games.

Which involved for you building the executable (eboot is the PSP's executable format right?) from source after making a small change, right? That's something a nerd like me might be able to figure out in an afternoon but most people aren't developers and so couldn't do that practically speaking for each new revision that comes out.

Are you saying we need a patch from the Star Road people which stops the game from writing to r0? (I don't even know what r0 is. Not familiar with the innards of Nintendo hardware or software)

Thanks for the advice on the speed cheat. I will try that sometime soon.

Nerd42 · **Joined:** Mon Nov 17, 2008 9:55 am **Posts:** 62

about building PSP apps from source: it would be nice to be able to code up a little something to run on the PSP but I dunno what tools I would need to get started. I know a little C++ and Python

Reamer87 · **Joined:** Sat Nov 06, 2010 1:04 am **Posts:** 569

The link to the tutorial I used is at the bottom of this post, but read on before venturing into psp development.

With the tutorial you should install the latest version of pspsdk instead of installing the pspsdk in the tutorial. You should be able to get the latest pspsdk (0.11 is what I have) here: http://ps2dev.org/

I should also mention that once you're able to compile here's a new list of files to transfer to run DaedalusX64:

Daedalus.cht
dvemgr.prx
EBOOT.PBP
exception.prx
mediaengine.prx
imposectrl.prx
sysevent.prx

Other than those two things, the tutorial worked out great for me. Though you might need to make a few educated guesses on how you want to edit the source files.

http://forums.daedalusx64.com/viewtopic.php?t=318

Corn · **Joined:** Sat Jan 31, 2009 7:11 am **Posts:** 442

Nerd42 wrote:

Are you saying we need a patch from the Star Road people which stops the game from writing to r0? (I don't even know what r0 is. Not familiar with the innards of Nintendo hardware or software)

R0 is a register in the MIPS CPU that is always zero. Writing to it will not change that fact (it will be considered as a NOP but I am not sure about what happens with CPU flags). Since we emulate all the regs in a array in memory it possible to write to any register including R0 and doing so will make the emulation fail since other instructions after the write depend on the register always being zero. Best way to fix it is to scan the ROM for OP-codes that writes to R0 and replace them with a proper NOP instruction. Adding a flag in the emulator to check for R0 writes and/or restore zero in R0 is not an option since it will slow the emu down.

kakarotto · **Joined:** Sat Mar 05, 2011 11:13 am **Posts:** 85

all 3 works with the eboot posted by Salv-E

Nerd42 · **Joined:** Mon Nov 17, 2008 9:55 am **Posts:** 62

Corn wrote:

R0 is a register in the MIPS CPU that is always zero. Writing to it will not change that fact (it will be considered as a NOP but I am not sure about what happens with CPU flags). Since we emulate all the regs in a array in memory it possible to write to any register including R0 and doing so will make the emulation fail since other instructions after the write depend on the register always being zero. Best way to fix it is to scan the ROM for OP-codes that writes to R0 and replace them with a proper NOP instruction. Adding a flag in the emulator to check for R0 writes and/or restore zero in R0 is not an option since it will slow the emu down.

Aha! Thank you. That explanation makes total sense. I took an assembly class once. Did a little MIPS

loveyy · **Joined:** Thu Nov 17, 2011 7:23 am **Posts:** 337

i dont get what the main problem is here?the hack works i tried it,but what your problem is the game doesnt save?

Nerd42 · **Joined:** Mon Nov 17, 2008 9:55 am **Posts:** 62

kakarotto wrote:

all 3 works with the eboot posted by Salv-E

Yeah but Star Road goes really alow on my PSP 2000 slim. Looks like you have a newer model PSP there

Reamer87 · **Joined:** Sat Nov 06, 2010 1:04 am **Posts:** 569

Nerd42 wrote:

kakarotto wrote:

all 3 works with the eboot posted by Salv-E

Yeah but Star Road goes really alow on my PSP 2000 slim. Looks like you have a newer model PSP there

Or kakarotto could be using different settings than you did.

kakarotto · **Joined:** Sat Mar 05, 2011 11:13 am **Posts:** 85

psp go, everything deafult+ HLE and memory access on.
No frameskip, no sound.
Not too fast(original Mario64 usa has 30 fps max, Pal 25max) but nice and playable

Nerd42 · **Joined:** Mon Nov 17, 2008 9:55 am **Posts:** 62

Once I understood the problem well enough to communicate it to Skrelux, he responded with a patch that fixes the issue with Star Road. Apply this patch to your Star Road rom (after running the extender and applying the Star Road patch) and it will run on Daedalusx64.
http://www.mediafire.com/?7tl525zxt67hcpd

I am hoping he will release a similar Christmas Carnival patch as well so that the modified EBOOT will no longer be needed.

Nerd42 · **Joined:** Mon Nov 17, 2008 9:55 am **Posts:** 62

This still leaves us with the Missing Stars issue that has yet to be resolved. I might try applying his test patch to it again in case I did it wrong the first time.

Nerd42 · **Joined:** Mon Nov 17, 2008 9:55 am **Posts:** 62

Salv-E wrote:

Read this thread if you don't know how to add cheats
viewtopic.php?f=12&t=3298

The Star Road readme says it's meant to be played with a GameShark cheat that adjusts the camera:

Quote:

8033C685 0005
8033C849 0002
D033AFA1 0010
8033C849 0000
D033AFA1 0008
8033C848 0030

Gonna have to figure out how to get that into the 1964 format I guess.

lupus · Posted: Sun Jan 15, 2012 5:44 am

Star Road now playble with non modified DaedalusX64?

Nerd42 · **Joined:** Mon Nov 17, 2008 9:55 am **Posts:** 62

lupus wrote:

Star Road now playble with non modified DaedalusX64?

When you apply the crash fix patch on top of Star Road, yeah.

Hopefully this should be the lines that need to be added to Daedalus.cht

Quote:

[SM64 Star Road]
NumberOfGroups=1
SMSR Camera Control=0,8033C685-0005,8033C849-0002,D033AFA1-0010,8033C849-0000,D033AFA1-0008,8033C848-0030,

(later edit) The cheat code doesn't show up!!

Super Mario 64 Star Road, Christmas Carnival & Missing Stars

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