Overclocking the DC and where to get the Increase

[Morph]

Havent had the opportunity. I must first get a new soldering iron tip, since my old one is worn all to hell. I will as soon as possible.

Btw, on a seperate note, I figured out why Revision 2 DC's won't play CD-R's and probably why they dont overclock.

[ptr.exe]

Care to mention why?

[Morph]

The entire reason why CD-R backups worked on the DC's was because the Sega programmers had put a "back door" sequence in the bios so that they could boot from CD-R's and develop games and such faster without wasting valuable GD-Roms. No one knew about it for a long time, and even Sega forgot. By the time that hackers had learned of how to take advantage of the sequence, the Revision: 1 models had been out for some time.

So odds are, Sega replaced the bios in its Revision: 2 with a more "airtight" version that won't accept backups, like the Dreamcast was originally intended. That could also explain its inability to overclock.

[ptr.exe]

Seems feasible but unlikely as the whole reason, the bios will cause the DC to not boot CD-R's but it doesnt really explain why the A02 DC's cant OC.

I posted before a theory and i think that its likely, and could be proved/disproved easily if i had a rev2 mobo.

The chip that (possibly) generates the SH-4's power - IC 104. It's in a differant place on a A02 and is a differant type of V. regulator. You said before that the DC OC's well because of the high vcore of 1.99V so perhaps on rev2 boards the new IC only generates the required V. for the SH-4 to run at 200Mhz rather than the excess the rev1 and 0 produce.

Its possible but again unlikely, as why would they change it?

[Morph]

Sorry about being all gone and stuff. For some reason, the dcemu forums won't load in IE anymore on my PC. But anyways. what you suggest sounds plausable. Perhaps Sega used cheaper parts/configuartions for the Rev2 making it incompatible with our prior OCing knowledge.

[Cross]

Its nice to be back, dispite the debacle in the PSP EMU forums. I have not gotten any word from those I asked for help, lol good thing the DC's not worth much or I would really be worried. I hope to hear from them before its to late and someone else does it, lol it would seem Morph and PTR (and their fast and excellent work!!) have beaten me to the punch.

Hopefully either way we will have the answer we seek soon.

[ptr.exe]

lol it would seem Morph (and his fast and excellent work!!) have beaten me to the punch.

Morph hasnt actually done anything, lol.

Morph you probably need to buy a multimeter and a soldering iron tip, doubt you'll get very far without them

[Morph]

Well, just a soldering tip. You covered the whole voltage part, so now I can procrastinate in getting a multimeter sommore. And as for my "hard work", shoot, I only did a little research and asked questions, ptr and thems guys from dcdev did the work, I just out 2+2 together and got fish.

waitaminute......that isnt....

[Cross]

Corrected, my mistake did not mean to leave u out ptr, lol. Fish sounds right Morph lol.

[ptr.exe]

fish? yukky.

No, no, i dont want any credit, if it werent for Morph i never would of thought about this. btw, ive figured a way of finding out if pin 3 on IC 104 is the SH-4 power supply, it involves no fancy equipment, so i'll give it a try tommorow.

Also morph, i have a DC that wont OC to 276 for some reason so i may do some research by building a circuit to produce 2.01 V with 0.23A, i have it designed just need to get some resisitors with a variance of 1% to ensure its accurate.