Extreme Amiga overclocking.

[melott]

I'm sorry to be so rude as to interupt this semi-interesting
discussion about the 040 chip  :-D

But has anyone tried over-clocking the MoBo on any Amiga?
Not just the processor, but the whole MoBo.

I'm curious (also ignorant of such things).

[Amiga1200PPC]

PMC wrote:
@BoingBoss

As for the assertion that Germany makes the highest quality stuff, I know of several Wolfsburg made VWs that break down with alarming regularity, certainly more so than many people with certain French / Italian / Spanish / Korean cars can testify....  Just me having a harmless jape at your expense ;-)

That's a thing that should not be.
VW never must break down.
That's why VW is selling much cars, because of the broadly accepted quality.
Perhaps they send the crap ones over to England and keep the better ones in Europe.
Or they refuled with diesel instead of petrol ;-)

[Ilwrath]

But has anyone tried over-clocking the MoBo on any Amiga?
Not just the processor, but the whole MoBo.

Essentially, that would be overclocking the chipset, and AFAIK, the custom chipset doesn't like to be overclocked by more than few percent past default NTSC.  (May also mess with video output, come to think of it?)

[Matt_H]

There was a thread on here many months ago about overclocking the chipset... come to think of it, I think it came out of a thread I started about using a pin-compatible 68010 as a drop-in replacement on an A600.

If I remember correctly, overclocking the chipset did not work, and there were severe video problems. Theoretically,  if you could get it perfectly doubled, you might have a default 31KHz video output. (?)

[melott]

>If I remember correctly, overclocking the chipset did not work, and there were severe video problems. Theoretically, if you could get it perfectly doubled, you might have a default 31KHz video output. (?)

Hmmm... if thats the case, wouldn't a Multi-Sync monitor
solve that problem ??

[BoingBoss]

I am just messin with you guys.  You folks sure do take the bait.   :-D

[billt]

@BoingBoss

The problem I am having is that my Amiga 2500 will not "see" the memory on the Progressive 2000/040 board. SysInfo sees the 68040 processor just fine, but not the SIMMs. I am sure that I have the jumpers set correctly, but just in case, how should they be set? I need the extra memory because I am working with 24-bit graphics and the 8 megs on the Zorro II bus is not enough. I need at least 8 to 16 megs of 32-bit memory in order to use my GVP EGS 28/24 Spectrum video board to its fullest potential.

I had a Progressive 040/500, and to use the extra RAM on that you needed to use a software tool to enable it. If I remember, I ended up using RomTagMem from aminet instead of the tool that was on the PP&S floppy disk, as RomTagMem allowed to configure the RAM and then immediately do a soft reboot, which would let the system get into that memory rather than be stuck in slower motherboard RAM for hte OS. RomTagMem wasn't super easy to use, and you'd need to use the Progressive program at least once to figure out hte address the on-board RAM starts at, btu it was great.

[billt]

All you have to do is take a good look at the way the Amiga 2000 Series computers are built and you will plainly see that they are the best built of all the Amiga models. Afterall, the Amiga 2000 was designed and made in Germany, so hence the higher quality.

Yea. The A3000T I've seen was built like a tank too. But I understand there were two A2000 designs, one in Germany and one from USA. The German one using a single Zorro slot and some other differences, but perhaps they kept the German case design. Regardless, the case design, screw threads, etc. do not a high quality computer make, IMHO. I'm more of an electronics guy myself, give me a great motherboard in a crappy case and I'm reasonably happy with it... I much prefer using my A4000T (Quickpak style), A3000D, and AmigaOne to my ancient A2000T (self-built full tower) which now lives in my attic. The A2000 with 040/33, 8MB 32bit RAM (maxed), and Zorro2 just couldn't keep up with the software I want to use these days. ImageFX, which you might call "work", runs MUCH better on my 4000T than my 2000... Am I weird?

[Dr_Righteous]

Matt_H wrote:
If I remember correctly, overclocking the chipset did not work, and there were severe video problems. Theoretically,  if you could get it perfectly doubled, you might have a default 31KHz video output. (?)

You should be able to overclock the chipset somewhat... As I recall that's what a genlock does to sync up the video output. Isn't that why CPU clock frequency is seperate from the chipset in the first place?

[Ilwrath]

You should be able to overclock the chipset somewhat... As I recall that's what a genlock does to sync up the video output. Isn't that why CPU clock frequency is seperate from the chipset in the first place?

I'm not sure if an Amiga genlock adjusts the Amiga's video timing, or adjusts the timing of the video after it leaves the Amiga.  I always assumed it was the later, but perhaps I'm mistaken.

Anyhow, to run a CPU faster than 7mhz, the CPU frequency is seperated from the chipset/video/motherboard frequency.

Hmmm... if thats the case, wouldn't a Multi-Sync monitor solve that problem ??

I don't think so...  Not unless you also have a set of new screenmode definition files (like the NTSC/PAL/DblPAL/Super72 files) that take into account the new pixel clock.  

Otherwise I suspect you might get sync, but the display would probably still be garbled and framed wrong.  

[Brian]

@BoingBoss

No you're not "messing" with ppl, you are insulting them and mock those who react. You got another chance from the ops to clean up your act and stay on but I see you've slided into your real self rather quickly and I guess it's just a matter of time before you're kicked out of the forum once more.

[Framiga]

guys!!! don't wast your time with a dude that claims that "to play Quake is better than SEX" !!!

come on . . .he is copying&paste the same old story from the beginning!

EDIT- arghh . . . i'm fall back, in the Doomy trap again

[redrumloa]

But has anyone tried over-clocking the MoBo on any Amiga?

Yes. You know what happens? The syetem gets slower, much slower.

But you are getting warm:-)

[melott]

@redrumloa
          ---------------------------------
Yes. You know what happens? The syetem gets slower, much slower.

But you are getting warm
          ----------------------------------

Sounds like you're working on something interesting.
You gunna let us in on it soon ??

[Karlos]

I wonder if Red's tinkering with bus / CPU clock synchronization?

[B00tDisk]

I once overclocked my 1084S to get it to display a (slightly) flicker-free 640x400 with my A1200's standard, no-flicker-fixer-in-place video out.

It caused the monitor to dim somewhat (had to crank up the contrast) and I lost the bottom 4 lines on the screen - think PAL display on NTSC but not as much screen real-estate unviewable.

Hey, it worked! (And probably took years off of the monitor's life)

I think you can find the info on how to do it on aminet.  Of course these days who needs to do all of that?!