#76481 - swzte - Wed Mar 22, 2006 1:54 am
As the subject, who know the frequency ARM7 and ARM9 run at respectively? Can we change the frequency?
Thank a lot!
#76506 - m2pt5 - Wed Mar 22, 2006 7:14 am
If I remember correctly, the ARM9 is 66MHz and the ARM7 is 33MHz.
As for adjusting these, there is a video floating around of a DS that someone has seemingly overclocked. It shows Mario Kart playing at 200% speed, as well as 50% and 25%. It's entirely possible, but the games are tuned for the default speed.
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#76598 - tepples - Thu Mar 23, 2006 12:44 am
Specifically, the ARM7 is probably specified as 33.55 MHz (2^25 Hz) plus or minus about 30 kHz, and the ARM9 is twice that.
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#77225 - Payk - Wed Mar 29, 2006 4:56 pm
i really dont know u guys but before i buy some technical stuff i look @ clockrate, ramsize futures.... What i would say : How could u dev. for a device before knowing it? Sure its possible but i allways try to get an image of the device i programm for...
#77234 - Sausage Boy - Wed Mar 29, 2006 6:17 pm
I wouldn't say clockrate gives an image of a device, it's really quite misleading. Higher clockrate is not equal to better performance, it depends on lots of stuff.
If you want more info about overclocking, I'd suggest you contact Furre on IRC, Efnet, #dsdev.
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#77343 - Payk - Thu Mar 30, 2006 2:44 pm
Dont know if u meaned me with that but if u meaned me read more before posting. I meaned all technical stuff like clockrate, ramsize...
But Yes there is much more on which depends speed. Of course a 8bit cpu with 10mhz cant do that much like a 16bit version with same speed. Also the floatingpoint plays a role (espacialy for 3D opperations). But thats still not all.
#78506 - omaremad - Fri Apr 07, 2006 7:32 pm
Well the ds's clocks are not very good indicators as most of the function you will be using are buiylt inro the actual hardware
you have sprite and background layers done on hardware making parallax scrolling very fast, if this was done in softaware based framebuffer mode it would be very slow almost still if done on both screens
The ds's 3d core also runs on the arm9 its a weird core that runs at 60 fpsaslong as you adere to the poly limit
you have 4mb of ram
656kb of vram
the vram buffer are nice for some special effects....
the gfx are copied directky to the vram which keeps your 4 megs nice and free unless you decide to do frambuffer graohics
If you are starting out try palib (infact even pro should use it, iussualy have to use some ndslib functions if i need to do some manualy vram bank manage ment)