Author Topic: Count to 10,000 in ASM (Read 10315 times)

thepenguin77 · « **Reply #30 on:** February 19, 2012, 07:36:58 pm »

It depends what your goals are, but the fastest way to count from 0 to 60,000 (definition: 1 register holds every single value from 0 to 60,000) would look like this:

Code: [Select]

	ld	hl, 0
	ld	de, 0
	ld	bc, 60000
	ldir

This code would take .076 seconds to run at your standard 16.5 Mhz. HL and DE would both count to 60,000 and BC would count from 60,000 to 0. Going to 10,000 would take .013.

Edit:
Technically there is a faster way, but it requires 120,000 bytes of instructions.

shmibs · « **Reply #31 on:** February 20, 2012, 01:51:14 am »

Quote from: nxtboy III on February 18, 2012, 10:53:38 am

I made a program for it on my NXT in assembly that counts and displays the number.(It displays the number in the same place the whole time.) It counts to 10,000 in about 4 seconds.

there's no way that you are getting 2,500 frames per second. i'm guessing that whatever method your using isn't "turning off the OS overhead" like qwerty said, and that it manages screen updates itself with interrupts, and that all you're doing is writing the character data to a RAM buffer somewhere.
the processor in the NXT brick runs at 48 MHz (or so the internet tells me), and the z80 in the 83+ and 84+ run at 6 MHz and 15 MHz respectively, so it will, indeed, count faster. like qwerty said, that's not the best way to determine "how fast it will run," but when the differences are that obvious, it's not a question.

DJ Omnimaga · « **Reply #32 on:** February 20, 2012, 01:56:26 am »

(off-topic: everytime someone posts in this topic, due to the topic title in OmnomIRC I always think somebody revived this thread but outside the spam sub-forum X.x)

calc84maniac · « **Reply #33 on:** February 20, 2012, 02:39:40 am »

Also, the NXT has an ARM7 processor, correct? The architecture itself is faster than the z80 too (stuff takes less clock cycles, there are more registers, 32-bit instead of 8-bit, etc)

DJ Omnimaga · « **Reply #34 on:** February 20, 2012, 03:06:54 am »

Maybe the screen/LCD driver of the NXT is just considerably slower than the already slow 83+/84+ one, or worse, the Prizm one?

nxtboy III · « **Reply #35 on:** February 20, 2012, 09:26:22 am »

Yes, it has a 32-bit ARM7 Microprocessor running at 48 Mhz.
DJ_O-
Well actually, even if I make the program not display anything, it is faster than the TI 84 not displaying anything. And I actually think the NXT's display driver is faster than the Ti-84's. I can tell you the refresh rate. It refreshes every 17 milliseconds.

Author Topic: Count to 10,000 in ASM (Read 10315 times)

thepenguin77

Re: Count to 10,000 in ASM

shmibs

Re: Count to 10,000 in ASM

DJ Omnimaga

Re: Count to 10,000 in ASM

calc84maniac

Re: Count to 10,000 in ASM

DJ Omnimaga

Re: Count to 10,000 in ASM

nxtboy III

Re: Count to 10,000 in ASM