After poking around Cemetech and talking to some of the higher ups, I decided to try my hand at hardware overclocking my Ti 84+.
I've been aware of asm ways to change the clock mode from 8MHz to 16MHz before, but I wanted to try and imitate what others have done by changing resistor values.
My first idea was to change out a resistor and a capacitor like we did in the good ol' days of the Ti 83. Alas, this did not go over well when I opened up the 84+ and barely recognized any piece of hardware.
KermM pointed me in the direction of an overclocking thread in which a few have overclocked the Ti 84+ C SE and such (here: http://cemete.ch/t8936)
After studying Val's post on page 2, I finally found the right R07D resistor (hiding under a blob of glue) and desoldered it. Next I took a 5k trim pot and soldered it to the pads using some REALLY thin wire)
After testing to make sure I didn't destroy the calculator, I set about filing down a nice hole for accessing the pot that I hot-glued to the PCB. I was going for a position in which I wouldn't accidentally bump it but still be able to change the value.
Here is the finished result (I should have taken assembly pictures):
Here's the DrDnar's speed test:
While this works and all, why does the cpu report 5.5278MHz as the base clock and then jump right up to the 22.xxMHz? Does this mean that the calculator is actually running at 5.5278MHz for normal use unless otherwise specified?
I've been aware of asm ways to change the clock mode from 8MHz to 16MHz before, but I wanted to try and imitate what others have done by changing resistor values.
My first idea was to change out a resistor and a capacitor like we did in the good ol' days of the Ti 83. Alas, this did not go over well when I opened up the 84+ and barely recognized any piece of hardware.
KermM pointed me in the direction of an overclocking thread in which a few have overclocked the Ti 84+ C SE and such (here: http://cemete.ch/t8936)
After studying Val's post on page 2, I finally found the right R07D resistor (hiding under a blob of glue) and desoldered it. Next I took a 5k trim pot and soldered it to the pads using some REALLY thin wire)
After testing to make sure I didn't destroy the calculator, I set about filing down a nice hole for accessing the pot that I hot-glued to the PCB. I was going for a position in which I wouldn't accidentally bump it but still be able to change the value.
Here is the finished result (I should have taken assembly pictures):
Here's the DrDnar's speed test:
While this works and all, why does the cpu report 5.5278MHz as the base clock and then jump right up to the 22.xxMHz? Does this mean that the calculator is actually running at 5.5278MHz for normal use unless otherwise specified?