Maximum Overclocking for GBs

[RedGameboy]

I have found plenty of information on how to overclock the various Gameboys but no one seems to have tried to see how much each of the Gameboys can tolerate as far as overclocking goes. Personally I am curious about the GBA, but I figured others have probably had the same thought for each of them, so what are the highest values you guys have tried on all of them?

EDIT:

GBC's highest is apparently 47 MHz

GBASP apparently won't boot higher than 13.5 MHz

 

[unicycler17]

The GBC has an 8 mhz crystal installed. The GBA uses a 4 mhz crystal. So you can use a higher mhz crystal on a gbc than on a gba. I've heard of people having problems using 13 or 14 mhz crystals on GBA's, so I would go with 12. I could be wrong, but I think 16 mhz is where you want to be if you're overclocking a GBC.

Personally, I overclocked my SP using a crystal I pulled out of a dead gamecube. I think the crystal from the gamecube might be 13mhz, but I wouldn't bet on it.

 

[samjc3]

I swear Bibin was playing with gameboys and a frequency generator at some point.

 

[Zero]

I don't know if Bibin ever tried it, but I know Marcan did it with a GBC.

 

[RedGameboy]

That's awesome! Is it possible to wire multiple oscillators (of the same value) so that they add to each other? (ie make 2 8MHz crystals act as one 16MHz crystal)

 

[RedGameboy]

Does anyone know about the others?

 

[bentendo64]

For some reason I think when I was messing around with Oc'in a GBA, it would only go about twice as fast as normal no matter what value crystal I put in.

 

[Bibin]

That's awesome! Is it possible to wire multiple oscillators (of the same value) so that they add to each other? (ie make 2 8MHz crystals act as one 16MHz crystal)

Nope, unfortunately. You can use a microcontroller to pump out oscillations in place of an actual oscillator circuit.

Also, protip: Oscillators and Crystals are closely related, but are not the same thing. The crystal is used in a circuit to make the oscillator.

Oscillators typically come in four-pin packages, while crystals come in shiny silver two-pin ones that are shaped like old bath tubs. Sometimes, the crystals are available in a four-pin package, however.

 

[RedGameboy]

RedGameboy wrote:
That's awesome! Is it possible to wire multiple oscillators (of the same value) so that they add to each other? (ie make 2 8MHz crystals act as one 16MHz crystal)


Nope

Aww, that sucks.

Also, protip: Oscillators and Crystals are closely related, but are not the same thing. The crystal is used in a circuit to make the oscillator.

Oh whoops... Thanks