TI 84 Plus Calculator sPi

[Knight]

Here is my code for creating a sPi program for calculators. I know most people have the same calculator (84, 83, ...), but I just wanted to try this out. My problem is how to run calculation along side the timer function.

Calculate pi:

1->S
0->C

For(A,1,4000,2)
(4/(S*A))->B
B+C->D
D->C
(-1*S)->S
End

Disp "Pi ="
Disp (C+0.0005)    // Error correction due to using a small number. (4000)
Output(1,1,"")

Timer: (Sadly I didn't create this. This goes out to Ticalc.org.)

For(Z,0,9)

For(X,0,59)

For(M,0,99,7)
Output(1,4,Z)
Output(1,5,":")
If X<=9
Then
Output(1,6,0)
Output(1,7,X)
Else
Output(1,6,X)
End

Output(1,8,":")
If M<=9
Then
Output(1,9,0)
Output(1,10,M)
Else
Output(1,9,M)
End

End

End

End

I can't seem to make it so that both run at the same time, and that the timer stops when Pi is found. I bet it is something obvious. (Sorry it has been a while since I have coded anything.)

My goal will be to over clock my calculator.

[MotF Bane]

I'll take a look at those during Stats - plenty of free time there.

[AliG]

I actually like making programs for my 84 silver, its fun and makes math homework quite a bit more efficient, not to mention its simple to do

I'll put it in once I have some spare time, but I've never messed with timer functions so I may not be of much help

[Knight]

Thank you both for the replies. I thank you for testing this stuff out.

The timer is pretty basic. Not bad, but not the best. As long as we can all compare scores that were determined by the same timer.

Is there a way to bypass "2nd" + "ON"? That would be heaven for some of my other work.

[MotF Bane]

Thank you both for the replies. I thank you for testing this stuff out.

The timer is pretty basic. Not bad, but not the best. As long as we can all compare scores that were determined by the same timer.

Is there a way to bypass "2nd" + "ON"? That would be heaven for some of my other work.

For shutting down the calculator? It times itself to shut down by inactivity also, but otherwise, not really. "Alpha" + "ON" also works for some methods.

[Knight]

For shutting down the calculator? It times itself to shut down by inactivity also, but otherwise, not really. "Alpha" + "ON" also works for some methods.

I should have been more clear. You know when you run a program that takes a long time to finish? Well when you hit the "2nd" key or the "Alpha" key then "ON" the program breaks with an error. I want to disable that break so that the program can't end.

[MotF Bane]

I should have been more clear. You know when you run a program that takes a long time to finish? Well when you hit the "2nd" key or the "Alpha" key then "ON" the program breaks with an error. I want to disable that break so that the program can't end.

Just the "ON" key by itself is enough to error the program out. I do not believe it is possible to disable that - it might be a safety code as a precaution. We have Ctrl + Alt + Delete for computers, calculators have their "ON" button.

[Martijn]

Oh, I'll see if I can run this on my TI83... I need to overclock it now

[tiborrr]

Hehe, i have Ti-92, will try it soon.

[Knight]

Oh, I'll see if I can run this on my TI83... I need to overclock it now

The sPi and Timer function both work independently. I need someone smarter than myself to try and combine to two so that we don't need to use an outside timer. (ie: stopwatch) But by all means go ahead and try this out. Let us know what you experience.

Hehe, i have Ti-92, will try it soon.

I would love to see what we can get out of that. I have never heard of the Ti-92 and of its CPU. Could be fast.

[tiborrr]

Man, cant seem to find the PC cable. Anyone got any eBay links to buy one?

[Knight]

Man, cant seem to find the PC cable. Anyone got any eBay links to buy one?

Sorry, Ebay is new to me, so forgive me if I post something wrong.

http://search.ebay.com/search/search...ble&category0=

USB?:

http://cgi.ebay.com/TI-84-Silver-USB...QQcmdZViewItem

[Omastar]

I know the 84-Plus uses a 15MHz Zilog processor, not sure about the 92s. I stumbled across a site one night where a guy hardmodded his calculator(s). I'll look for that.

Ah, here's something: http://en.wikipedia.org/wiki/Compari...ng_Calculators

Apprently this TI-Nspire has a 150MHz CPU? Hard to believe. But I was thinking the TI-92 used a Motorola processor, and it turns out it does.

Found it! http://richfiles.solarbotics.net/Turbo.html

[Knight]

I know the 84-Plus uses a 15MHz Zilog processor, not sure about the 92s. I stumbled across a site one night where a guy hardmodded his calculator(s). I'll look for that.

Ah, here's something: http://en.wikipedia.org/wiki/Compari...ng_Calculators

Apprently this TI-Nspire has a 150MHz CPU? Hard to believe. But I was thinking the TI-92 used a Motorola processor, and it turns out it does.

Found it! http://richfiles.solarbotics.net/Turbo.html

Thank you for the information.

I might be able to get my hands on a friends 83, so that I can try that hard mod.

[KaptainBlaZzed]

i overclocked an 83 back in the day by changing out one of the resistors, it made it about twice as fast. Games were crazy fast on it.

It was my first overclock.

[Knight]

i overclocked an 83 back in the day by changing out one of the resistors, it made it about twice as fast. Games were crazy fast on it.

It was my first overclock.

How long was the battery life? I might use some cells that have more capacity to keep the thing alive for a while.

[PCTC3]

I overclocked my TI-83 from 6MHz to 15MHz by swapping a capacitor, not resistor, I think. it should be C06 or something. My memory fails me.

But to run both at the same time, you need to learn TI ASM language. The TI assembly language allows more functions than TI-BASIC, including calculations beyond the standard variable length and archive/unarchive functions in addition to anything else you can do with a calculator. TICALC.org should have an SDK for it, or at least a link to it.

[Knight]

I overclocked my TI-83 from 6MHz to 15MHz by swapping a capacitor, not resistor, I think. it should be C06 or something. My memory fails me.

But to run both at the same time, you need to learn TI ASM language. The TI assembly language allows more functions than TI-BASIC, including calculations beyond the standard variable length and archive/unarchive functions in addition to anything else you can do with a calculator. TICALC.org should have an SDK for it, or at least a link to it.

Oh cool. I will check that out.

[Roger_D25]

It looks like this thread may have died but it was a great read! I'm currently in graduate school for mechanical engineering so this type of thing is pretty cool to me! I had no idea that this stuff was even possible on a calculator! I have a TI-83, TI-86, and of course a TI-89. I very rarely use my TI-89 so maybe that will be the test bed for trying this mods? I will post back any results and big mistakes I make. Thanks for all the great information regarding modifying our calculators

[FrogBite]

Graph the equation of y=sqrt(20000squared-xsquared) and get the integral from 0 to 20000. The result is 314159265.

[ixtapalapaquetl]

Doesn't the 89 (and therefore the92) have the means to keep time internally? I'm pretty sure it does. It might just be a matter of implementing a "gettime()" function twice and then subtracting.

[Knight]

Doesn't the 89 (and therefore the92) have the means to keep time internally? I'm pretty sure it does. It might just be a matter of implementing a "gettime()" function twice and then subtracting.

Will have to ask my friend. He is the only one who I know of that has the 89/92. Will look on the internet about this.

Thanks,

[ixtapalapaquetl]

SUCCESS! This is so effin cool!

There are a few 89-related syntax modifications to your original code, but all I really did was add in a couple gettime()'s and converted the difference (in {hr,min,sec} format) to seconds in order to prevent negative values from popping up. Note that the Clock must be manually enabled: Home -> F1 -> B and then set time and date. Unfortunately, the Clock does not seem to work on Virtual TI, so we can't run the emulator realtime on our computers...

spi89()
Prgm
ClrIO
getTime()->ti
1->s
0->c
For a,1,4000,2
4/(s*a)->b
b+c->d
d->c
-1*s->s
EndFor
getTime()->tf
tf-ti->dt
3600*dt[1]+60*dt[2]+dt[3]->tpi
Disp "pi="
Disp c+.0005
Disp "time="
Disp tpi
EndPrgm

Check it out!

102 seconds!!! Does this qualify as the current WR? Time for some memory tweaks!!!

Great work Knight! Obviously, feel free to modify any ugly code - my programming skills are limited to TI calculators, and thus may be substandard!

[Roger_D25]

SUCCESS! This is so effin cool!

There are a few 89-related syntax modifications to your original code, but all I really did was add in a couple gettime()'s and converted the difference (in {hr,min,sec} format) to seconds in order to prevent negative values from popping up. Note that the Clock must be manually enabled: Home -> F1 -> B and then set time and date. Unfortunately, the Clock does not seem to work on Virtual TI, so we can't run the emulator realtime on our computers...

spi89()
Prgm
ClrIO
getTime()->ti
1->s
0->c
For a,1,4000,2
4/(s*a)->b
b+c->d
d->c
-1*s->s
EndFor
getTime()->tf
tf-ti->dt
3600*dt[1]+60*dt[2]+dt[3]->tpi
Disp "pi="
Disp c+.0005
Disp "time="
Disp tpi
EndPrgm

Check it out!

102 seconds!!! Does this qualify as the current WR? Time for some memory tweaks!!!

Great work Knight! Obviously, feel free to modify any ugly code - my programming skills are limited to TI calculators, and thus may be substandard!

Would it be possible to do this on a TI-86 and if so how would the code differ from the above? Oh yeah, great job ixtapalapaquet that is very cool indeed! I would love to get this working on my TI-86 and then show it off to my math geek friends at school (I would be the king of cool), lol! I was just thinking about how geeky I must be to get excited about this, lol!

[Knight]

SUCCESS! This is so effin cool!

There are a few 89-related syntax modifications to your original code, but all I really did was add in a couple gettime()'s and converted the difference (in {hr,min,sec} format) to seconds in order to prevent negative values from popping up. Note that the Clock must be manually enabled: Home -> F1 -> B and then set time and date. Unfortunately, the Clock does not seem to work on Virtual TI, so we can't run the emulator realtime on our computers...

spi89()
Prgm
ClrIO
getTime()->ti
1->s
0->c
For a,1,4000,2
4/(s*a)->b
b+c->d
d->c
-1*s->s
EndFor
getTime()->tf
tf-ti->dt
3600*dt[1]+60*dt[2]+dt[3]->tpi
Disp "pi="
Disp c+.0005
Disp "time="
Disp tpi
EndPrgm

Check it out!

...


102 seconds!!! Does this qualify as the current WR? Time for some memory tweaks!!!

Great work Knight! Obviously, feel free to modify any ugly code - my programming skills are limited to TI calculators, and thus may be substandard!

You are added onto my hero list. The use of the getTime function was smart. Is it confirmed that it is not possible on a 83/84?

Great work.

More efficient coding might be determined by the method in which we calculate Pi itself. Of course I will experiment, and clean it up. So this can be our first version.