Overclocked

[Angel]

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Hi all!

The uzebox Overclocked to 28.61818Mhz, would it be possible to increase the speed? How high? Could we extend the graphical resolution to this?

Thank you very much for the answers

[Janka]

The uzebox Overclocked to 28.61818Mhz, would it be possible to increase the speed?

The clock rate has to be a integer multiple of exactly 3.579545 MHz, otherwise the NTSC color coding won't work (with RGB output, this restriction is nil).
So the current clock rate is 28.63636 MHz is 8 times that NTSC color burst frequency. The next integer multiples are at 32.215905 MHz and 35.79545 MHz, which is both nearly impossible to get a crystal for. So we'll had to use a PLL to synthezise these frequencies, which adds a lot of additional hardware and problems to the Uzebox.

How high? Could we extend the graphical resolution to this?

Uze has sure tested how high the overclocking works. I doubt it goes much higher than 35 MHz. The graphical resolution could be extended a little bit (e.g from 240 to 300 pixels in a row at 35.79545 MHz and mode 3).

[tysonedriscoll]

The graphical resolution could be extended a little bit (e.g from 240 to 300 pixels in a row at 35.79545 MHz and mode 3).

Is it possible to extende graphical resolution more?

[D3thAdd3r]

Is it possible to extende graphical resolution more?

It's already 143% of the 20mhz max speed specification, and not every '644 chip can even do the uzebox rate of 28.636. Whatever small percent of over-volted chips could do 35, get 1-2 extra cycles a pixel and still only have 4k ram to work with...so it wouldn't be a super nintendo/famicom all of a sudden