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Setting Up Core Frequencies

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#1 Irenek



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Posted 04 February 2008 - 01:50 PM

i think it's the same thing like exec-speed does.
with the help of http://documentation...081_sh7709s.pdf
i am now able to set the core-frequencies in real-time. but i can only switch between 33MHz and 66MHz.
every other combination of bits lead the classpad to crash. but i have read that somebody did a 3 and 4 times faster clock speed. so does anybody know how? i could not find any bit combination that worked.

i updatet '1001', know it is possible to control the tracer with the cross-pad and to switch between low and high speed via 'backarrow' for low speed and 'clear' for high speed so the use of exec-speed is not necessary.


the frequency at startup is restored after leaving the benchmark succesfully.

also interesting if someone know if it's possible to overclock the lcd-display.

#2 Irenek



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Posted 04 February 2008 - 11:42 PM

after spending some time in this forum, i have to say it is pretty disordered here. not the forum itself, but the posts ;).

so i got the code i wanted and it turned out that i used the wrong hardware documentation. there was a talk about 6 times multiplier instead of four.

so i tried the right code for speeding up classpad with factor 4 and its running quiet well for an hour now.
more is not possible within software, or? :) doesn't seem so.

i also tried the very well gameboy emulator, and uploaded some roms on the classpad via the ebook-reader tool. don't know if it's the right way, but it works. the graphic is awesome but the speed is low. i think thats because of the grayscales. i guess the display looks only sharp within a 200ms refresh cycle. so 5fps. and that is nearly how gameboy on classpad is to be played. i think faster rendering would result in flicker or so and you would not be in sync with the display.

for my benchmark i get know with 4 time speed a total overdraw of 2.3 at 20 fps.
so you can render more than twice to screen to get a smooth framerate of 20fps.

if someone knows plasma pong. this would be really possible. even in black and white with a good performance. the fast speed and the low refreshrate would give it a natural blur.
aussuming the cp can do the background calculation in reasonable time. with the use of parallel instruction, perhaps.

for myself i want to calculate and visualize behaviour of gravitation. so thats why i'm interessted in speeding up classpad.

but before i do that, i think i will learn to write a small 3d-renderer with depth-buffer and two-color rendering.
on pc it's useless because there is directx and opengl but on a calculator it could be funny.
grayscales would be to slow i think. but a small bsp-engine with per-trinangle-sorting should do it.

so if someone has already a real-3dengine done, put it on the table:). would be really interesting to hear what is possible on this calculator. :rolleyes:

#3 Xerxes


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Posted 09 February 2008 - 11:56 PM

Hello Irenek,

are you really sure about the 33 MHz?

Probably you have already noticed that Kucalc had found out the clock speed of the FX-9860G @ 14.74 MHz.

I have measured the power consumption of the FX-9860G and the CP-300+. Considering the same value,
I guess the clock frequencies are also identical.

If you need a benchmark to test the ClassPad versus FX-9860G, have a look here.
I have used the unstructured C version with 10000 iterations to test the FX-9860G (24.8 sec).

#4 Guest_Guest_Irenek_*_*

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Posted 11 February 2008 - 04:38 PM

it turned out that i used the wrong hardware spec-paper. :)

so default clock-frequency seems to be 16 2/3 MHz and goes up to 66 2/3 MHz withz 4 times multiplier.

first i just wanted to know the graphical-performance. now as i am trying to code a sofware-renderer the classpad turned out to be rather low in performance in respect to floating-point calculations. could it be? so i think i have to switch to fix-point numbers.

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