Overclocked dreamcast

[qatmix]

Just a quicky, I chould solder teh capacitor on teh gnd pin on the crytstal or just along the wire? Yup?

Also Icant find any othwer crystals apart from 40, 50 and 60 mhz. Anyone know where I can get other speeds?

[Alexvrb]

[quote author=quzar link=board=hardware;num=1094318646;start=15#19 date=09/06/04 at 02:37:54]I had the feeling that was the case. But I still wasn't sure. This could still be important in that it may tell us if certain DC processors give off less heat or such.[/quote]More importantly, if any of them were produced in a smaller process, they may well have more room for overclocking. ;D

[quzar]

[quote author=Alexvrb link=board=hardware;num=1094318646;start=15#21 date=09/06/04 at 15:11:43]
More importantly, if any of them were produced in a smaller process, they may well have more room for overclocking. Â*;D[/quote]

yea that too, or maybe just run more efficiently aka faster =P. wishful thinking though

[qatmix]

well atm I think this mod doesnt work as ive followed the instructions and im not having any luck.. although ive yet to add teh capacitor.

[qatmix]

Kajamin, what do you mean by the alignmet might be wrong?

cheers
Q

[Kamjin]

[quote author=qatmix link=board=hardware;num=1094318646;start=15#20 date=09/06/04 at 04:29:58]Just a quicky, I chould solder teh capacitor on teh gnd pin on the crytstal or just along the wire? Yup?

[/quote]

Yup, just keep it close the the crystal.

Kajamin, what do you mean by the alignmet might be wrong?

It's kind of a rough guess, most probably it's wrong.. but you never know..

It's kinda like the planets.. not much control over it.

The idea is that none of the devices are actually compatible to each other, so there has to be an intermeadiate circuit to "translate" the signals from one device to another. For instance.. in order for the CPU to takeover the vram. it has to wait until it's not being used, it's not being refreshed etc. Now imagine that this time only happens every 3 ticks, when the cpu was at 33Mhz the circuit was designed to syncronise the 3 ticks to the cpu.. but since the cpu is running faster it's ready every 2 ticks so it misses 3 times before it finally get access on the 6th tick.. so effictively we've reduced it's access to the ram by 1/2 although we've sped it up by 20%
Like I said.. rough guess.. today most of this stuff is handled by an intelligent device that actually takes, and puts data regardless of each devices speeds etc..

[qatmix]

SUCCES!

I think, Ive played Shenmue 2 and ran around the golden Qtr with NO slowdown at all!!! I have added a capacitor to the circuit between the %v and Gnd pin and it seems to have made a bit of a difference. I tried an emu but that didnt seem any differnt. But Shenmue 2 always slows down in the golden qtr, so it seems somethign is working (although it was late so Im going to have to double check later today)..

Still fingers crossed. Is it possible any of the coder types can knock up a basic cpu speed test, just a program which carries out a single operation multiple timeswithin a frame. Then as we know a dc is at 200mhz it can say e.g 10000 = 200mhz, tehn iff the dc calculates 15000 then it will know that the base spees should be 300 mhz for example?

Cheers
q

[Kron]

q if I throw you some money would you mind modifying one of mine on a weekend?

[Eric]

This sounds like an amazing thing for the dreamcast. Its really good somebody could work on making it faster cause i did find some games lag on dreamcast no matter if you buy for you the dreamcast has a slow down.

Now if this is correct that you have seen a difference for Shemue 2 which i believe would be a hard game to improve cause the graphics are so much more better then any game i have played for the DC (graphics i mean) and I believe this really would make a difference for other commercial games.

As for emulation i dont know what you guys can do to improve that besides the skills to get increased then we will see emulation and so on fullspeed and i think that might happen in a few years or so we will never know.


Eric

[qatmix]

Again, I will double check it tonight. I can hardly believe it myself. Let me however note, it will not mean all games will run faster and smoother. Some games may slow down because of GPU overload. This Mod will nod fix that. Although, Im tempted to try overclockign that.

Kron, Ill PM you later for a chat.