TI-81 through TI-92 Calculator OC link

[ShrimpBrime]

Wanted to drop this here for those that like overclocking stuff. Complete tutorials in the link below. 


richfiles.solarbotics.net/Turbo.html

[MachineLearning]

I noticed the TI-84 seems to be missing on that site.
I have overclocked the TI-84 myself a couple years back. Will replicate my TPU post here.
~~
My brother had an old TI-84 from who knows where (probably "borrowed" from a school ). And of course, it can be overclocked...



This is at stock speeds, as you can see the CPU hovers around 15.085MHz. At TI-83 game compatibility speeds it operates around 6MHz. This is dead-on average - the CPU may run at +/-20% the set clock speed, which for the TI-84 Plus was 15MHz. That variance is due to these two resistors, R07D and R08D. The former adjusts the fast frequency, and the latter adjusts both slow and fast frequencies. It's not recommended to touch R08D because it's more likely to make the calculator unstable in games which use this slower clock speed.


PCB Wk47/2005. This model was introduced in 2004, so this is relatively early-on. The CPU is a Zilog Z80, as I said @ 6/15MHz. The flash is a product of Fujitsu and AMD's joint venture Spansion, back when AMD made DRAM, and long before the Radeon rebranded Patriot / Dataram modules.

The limitation for these calculators is not typically the CPU, it's the flash. If the CPU operates too quickly (generally >23MHz), the flash feeds it incorrect data, as it's only specced to keep up until around ~20MHz. TI was conservative on the CPU clock side (highest stock I read about is around 17MHz). But you may push it higher, if you dare. I was conservative and wanted to bring it to the 20MHz zone. And to add heatsinks, of course...


Snip goes the foam, and I pried some of that plastic support on the backing with pliers to make room...


Pencil time:

R07D Initial value: ~ 1.17mOhm
Final value: ~ 0.72mOhm



Messy, but...?


~ 33% overclock. Nice I noticed at the time of editing ( a few hours after-mod) that the clock speed has increased to 20.250MHz, likely due to temperature / battery voltage shift. These RC's are inaccurate, so I'm learning

Good resources here and here. The program for testing the CPU speed is here.

83+ and others

Spansion flash datasheet

~~

The main reason to do this is fun, but actual graphing on the calculator is significantly faster.

[georgekokovinis]

Is there a way to overclock an oven to cook faster ?

[MachineLearning]

Jan 27, 2024 17:10:36 GMT -5 georgekokovinis said:

Is there a way to overclock an oven to cook faster ?

We call it a blowtorch.

[georgekokovinis]

Jan 27, 2024 17:14:51 GMT -5 MachineLearning said:

Jan 27, 2024 17:10:36 GMT -5 georgekokovinis said:

Is there a way to overclock an oven to cook faster ?

We call it a blowtorch.

Ahaha, lol nice one.

[Bones]

Jan 27, 2024 17:14:51 GMT -5 MachineLearning said:

Jan 27, 2024 17:10:36 GMT -5 georgekokovinis said:

Is there a way to overclock an oven to cook faster ?

We call it a blowtorch.

Eh - That's only good for individual servings.
If you want to do a "Family-Sized" meal in a hurry, you need one of these......

[ShrimpBrime]

Now you're cooking! You guys crack me up.