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Author Topic: Let's overclock Nspire to x2 or x4  (Read 19193 times)

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Offline Hot_Dog

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Re: Let's overclock Nspire to x2 or x4
« Reply #15 on: December 29, 2010, 10:50:53 am »
Btw, way to go on this! :D
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SirCmpwn

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Re: Let's overclock Nspire to x2 or x4
« Reply #16 on: December 29, 2010, 11:06:54 am »
At 300 MHz, GBA emulation would be no sweat.  This is awesome.
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Offline critor

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Re: Let's overclock Nspire to x2 or x4
« Reply #17 on: December 29, 2010, 11:14:32 am »
Quote from: SirCmpwn on December 29, 2010, 11:06:54 am
At 300 MHz, GBA emulation would be no sweat.  This is awesome.

If you want to overclock further and still being able to read the screen without catching a headache, we should fine some way to fix the OS idle loop problem.

The problem is not specific to the 1.7 OS.
I've just tried with non-CAS OSes 1.3 and 2.0.1 -> same problem with any base frequency different than 180MHz.


Definately, the screen seems to be one of the most annoying things on the TI-Nspire...


By the way, Nover has just been queued on TiCalc.org.
But you'll still be able to download it there:
http://ti.bank.free.fr/index.php?mod=archives&ac=voir&id=2098
« Last Edit: December 29, 2010, 11:17:46 am by critor »
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Offline calc84maniac

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Re: Let's overclock Nspire to x2 or x4
« Reply #18 on: December 29, 2010, 07:00:30 pm »
Quote from: SirCmpwn on December 29, 2010, 11:06:54 am
At 300 MHz, GBA emulation would be no sweat.  This is awesome.
It's 150MHz, I don't want to say it again.
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Offline fb39ca4

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Re: Let's overclock Nspire to x2 or x4
« Reply #19 on: December 31, 2010, 10:24:12 am »
So why are we getting the problem now? Bwang's raycaster already OCed the nspire, and nothing odd happened.
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Offline Silver Shadow

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Re: Let's overclock Nspire to x2 or x4
« Reply #20 on: December 31, 2010, 11:14:24 am »
The screen problems seem to dissapear when Ndless programs are run.
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Offline qazz42

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Re: Let's overclock Nspire to x2 or x4
« Reply #21 on: December 31, 2010, 11:16:59 am »
Quote from: SirCmpwn on December 29, 2010, 11:06:54 am
At 300 MHz, GBA emulation would be no sweat.  This is awesome.

what about SNES and the like?
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Offline critor

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Re: Let's overclock Nspire to x2 or x4
« Reply #22 on: December 31, 2010, 12:24:23 pm »
Quote from: fb39ca4 on December 31, 2010, 10:24:12 am
So why are we getting the problem now? Bwang's raycaster already OCed the nspire, and nothing odd happened.

The problem is with the OS.
Bwang's raycaster was cancelling the overclock when returning to the OS.
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Offline willrandship

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Re: Let's overclock Nspire to x2 or x4
« Reply #23 on: December 31, 2010, 01:54:43 pm »
SNES Emulation is more likely than GBA. GBA has a snes emu :P GBA would be much harder, even with the similar hardware (which, by the way, really kind of cancels out with later nintendo handhelds. The GBA, DS, and I think the GBC  too, all had two processors. They had theirs and their predecessors, for backwards compatibility. This makes them harder to emulate, since the nspire only has 1 CPU, even though it is faster than the DS's two (ARM7 at 33 mhz and ARM9 at 66 mhz, not counting the DSi) combined.

However, yay for overclock! :P so 300 mhz (yes I know it's 150 really for the CPU) is as high as you can go, or can it go higher?
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Offline DJ Omnimaga

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Re: Let's overclock Nspire to x2 or x4
« Reply #24 on: December 31, 2010, 07:06:29 pm »
SNES emulation might be hard for games like Star Ocean, Star Fox, Mario RPG or other games using all sort of special chips, but otherwise it should be easy. I guess even chipped games should be doable, but they would run slower. I think with Star Fox, you have to emulate an additional 30 MHz, right?
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Offline fb39ca4

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Re: Let's overclock Nspire to x2 or x4
« Reply #25 on: January 01, 2011, 01:26:02 am »
20mhz, but since its graphics drawing routines mainly, they can be optimized w/o too much problems.
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Offline critor

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Re: Let's overclock Nspire to x2 or x4
« Reply #26 on: January 01, 2011, 07:52:14 pm »
Thanks to Ncubate (Goplat's emulator customized by ExtendeD) I've just found the exact value for TI's overclocking in OS 2.1.
(as Ndless is currently not working in OS 2.1, there was no other way to get the exact value)

* OSes 1.1-2.0:
- base: 180MHz
- CPU: 90MHz
- AHB: 15MHz

* OS 2.1:
- base 180MHz
- CPU: 90MHz
- AHB: 45MHz


Nover sets AHB to 90MHz (90/1 instead of 90/2) in its default overclock config.

And of course, with 90MHz, programs/functions are a little faster. Just made the tests. (the difference is seeable with operations taking severall secs)


I should update Nover soon with 3 default configs:
- no overclock (180/90/15)
- TI's official overclock (180/90/45)
- best tested overclock (180/90/90)
« Last Edit: January 02, 2011, 07:51:33 am by critor »
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Offline DJ Omnimaga

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Re: Let's overclock Nspire to x2 or x4
« Reply #27 on: January 01, 2011, 10:27:34 pm »
Interesting. I am unfortunately unfamiliar with that stuff, though so I do not understand much, but does it means the CPU can finally not be overclocked to 150 MHz (to get, for example, something like 300/150/90) without any solvable issues? Or could a solution be found?
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Offline critor

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Re: Let's overclock Nspire to x2 or x4
« Reply #28 on: January 02, 2011, 07:16:30 am »
Quote from: DJ Omnimaga on January 01, 2011, 10:27:34 pm
Interesting. I am unfortunately unfamiliar with that stuff, though so I do not understand much, but does it means the CPU can finally not be overclocked to 150 MHz (to get, for example, something like 300/150/90) without any solvable issues? Or could a solution be found?

The CPU can be overclocked to 150MHz within an Ndless program.
But this will have to be cancelled before returning to the OS.
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Offline critor

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Re: Let's overclock Nspire to x2 or x4
« Reply #29 on: January 02, 2011, 07:47:51 am »
Sorry for double-posting, but this is important information.


According to informations from ExtendeD, I'm correcting what I was saying above.

The hardware frequencies seem to be hard coded into Goplat's emulator, which means it returns 180/90/45Mhz for all OSes.


The official PDF from TI is clearly stating that speed has been improved by raising the AHB frequency, but is not giving any value. So the previous test doesn't prove anything.


For now, Nover will remain with both default configs: 180/90/15 (OSes 1.1-2.0) and 180/90/90 (the best overclock without issues with the OS).
« Last Edit: January 02, 2011, 07:50:06 am by critor »
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