Sega Dreamcast Overclock

I wasn't going to bother posting this, but o1s1n expressed an interest in seeing what was done. It's also been deathly quiet in here the last two days so I thought why not!

Basically the premise is simple. Lift the existing pin that supplies 33.33Mhz to the Dreamcast's multiplier & supply a new clock speed to where the lifted pin was soldered. The Dreamcast has an internal multipler of x6, giving the original clock a speed of 200Mhz (33.33Mhx x6 = 199.98Mhz). This particular mod supplies a new clock of 40Mhz, totalling out at 240Mhz (40 x6 = 240Mhz).

There's a nice little spot beside the internal oscialltor to put the faster oscillator, meaning the connecting wire can be nice & short. This prevents any problems with a degrading clock signal, something I learned while doing the Megadrive overclock mod. So that's basically it, reports indicate the slowdown in affected games is reduced, and as it's only a 40Mhz improvement, additional cooling or extra power needs arn't an issue.

The relevant pin is lifted here, and a new wire about to be soldered to the pad where the lifted pin was.



Wire in place, the other end is soldered to the relevant pin on the ner oscillator. 5v & ground are then applied to the relevant pins on the oscillator also, before insulating it (they are made of metal after all ). 5v and ground and readily available on the PSU pins in the background.



Thats more or less it, reassemble & test. It's not the most difficult pin to lift, with the pin on the Megadrive 2 being a lot smaller (region & language mod).

Thats it folks.