Wanted: 100 MHz Oscillator

[McTrinsic]

Hi all,

I am looking for a 100 MHz - Oscillator.

One of the rectangular ones, with the silvery "case" and the four legs. Like on most older A500 Accelerators.

I want to upgrade my Derringer / 030 from 25 MHz to 50 MHz.

Or does anyone know a different way to do this?

After all, you can jumper the FPU to run at 50 MHZ, is something similar possible for the CPU???

Have fun,
McTrinsic

[bloodline]

I'm sure you'll kill something

[McTrinsic]

Could you please explain?

The Derringer uses a 50 MHz Oscillator for generating 25 MHz and the Derringer Platinum uses a 100 MHz Oscillator to generate 50 MHz system speed.

*is puzzled*


Have fun,
McTrinsic

[bloodline]

A 25Mhz 030 will die at 50Mhz

[x56h34]

@McTrinsic:

I'm not familiar if Derringer uses a socketed or soldered to the motherboard 68030 CPU, however in order to reach 50Mhz, besides getting the above-mentioned oscilator, you will also need a 68030 CPU capable of running at that speed. AFAIK, you need at least a 40Mhz 68030 in order to clock @ 50Mhz without fear of creating damage.

If your 68030 is socketed, this job will be quite easy! If not... :-( percise soldering is required.

[McTrinsic]

Thanks for your replies, but I already have a 68030 and a 68882 for 50 MHz.

I bought a 1230 IV for these (anyone interested in a 1230 w/ 16 MB RAm but without CPU and FPU ? ).

So what i need is to get the Derringer to 50 MHz.

For that, I need a 100MHz Oscillator.

The Derringer runs at at 25 MHz right now with a 50 MHz Oscillator.


Have fun,
McTrinsic

[elektro_fabius]

@McTrinsic

Some months ago,with a my friend...we have overclocked an Apollo 1230 33mhz to 50mhz...but we have done this,because the 030 used for the 33mhz version is the same used for 50mhz version,the only difference is the oscillator.
Before you have to know if the 030 of your card is the same used for higher version..then you can trt to overclock.
In my opinion 100mhz for a 030 it too..even with a fan cooler.
I think that 50mhz will be ok.
Probabily your 030 runs at 25mhz because there is a limiter,jumper soldered in.

[Brian Hoskins]

Rapid Electronics can supply a TTL Oscillator module which runs at 100Mhz, but it's in the 8-pin-DIL type package, not the 14-pin-DIL that you're talking about.  I've checked their catalouge and their 14-pin-DIL oscillator modules only go up to 64Mhz for some reason.  What you could possibly do is make yourself an 8pinDIL socket for the oscillator and interface it to the 14-pin-DIL that's on the board.  Or, I'm sure there are other electronics suppliers who can probably supply you with a 100Mhz TTL Oscillator module in the 14-pin-DIL package.

Before we delv into that though, I have serious doubts about the chances of this working.  If your accelerator has a 50Mhz clock but the 68030 on board is only being clocked at 25Mhz, then somewhere on the board there must be a 2:1 divisor for the clock frequency.  Most probably you can change that divisor to 1:1 and that would be a much better option.  However, since I am not familiar with your particular board I can't really comment on how or where this is done on the board.

The problem you've got is that you don't know what the clock is actually doing.  For example, the 50Mhz clock could be clocking bus speeds at 50Mhz for RAM access and things, but only clocking the 68030 at 25Mhz.  So, if you go and wap a 100Mhz oscillator in there, you'll be clocking the 68030 at a nice, safe 50Mhz but the bus speeds will be running in overdrive.  This is why finding the frequency divisor and changing it would be a better, safer option here.

What exactly is the Derringer? Is it an A500 accelerator? I'll see what I can find out on it for you.

Brian

[Brian Hoskins]

Ok what I've found out so far is that the Derringer A500 card had an optional FPU unit which could be clocked at different levels depending on the quality of the FPU you purchased.  There is a jumper on the board (JP1) which determines the clock speed for the FPU, 25Mhz or 50Mhz.

I don't know yet how you change the clock speed for the CPU, that information is not given in the manual because the Derringer only came in a 68030@25Mhz form.  I'll keep looking, we really need technical details on the board now.

Brian

[Brian Hoskins]

Hmmm, seems the Derringer was available in 50Mhz form:

"Motorola 68030 accelerator available in 25, 33, 40 and 50Mhz clock speeds.  Math coprocessor socket included."

Still looking...

Brian

[Brian Hoskins]

Ok then, you were right all along - you can indeed install a 100Mhz oscillator in the Derringer - it was done in the Platinum Version which included a 68030@50Mhz.

See this link and note the oscillator used:

http://www.amiga-hardware.com/derringer030_big.jpg

So what we need to do now is find you a 100Mhz TTL Oscillator in the 14-Pin-DIL format. I can supply you one in an 8-pin DIL format, because I have on here in my supplies, but not in the 14-pin.  I'll try some electronics suppliers for you.

Brian

[Brian Hoskins]

Ok check Farnell Electronics - they have a 100Mhz TTL DIL oscillator module but it doesn't say if it's the 8 or 14-pin package, you'll have to email them and ask the question.  Here's the link:

http://uk.farnell.com/jsp/catalog/viewproductdetails.jsp;jsessionid=42IFUOT0AAXB1QFIAEWSFE4AVAAS0IV3?prodId=101412

Also, if your current oscillator is not socketed (it's soldered in) then I would also recommend that you purchase a 14-pin DIL socket and solder that in place of your current oscillator module, so that you can swap oscillators easily at a later date if the procedeure doesn't work properly.  If you ask any decent electronics supplier for one they'll know exactly what you mean by "14-pin DIL socket".

Best of luck, and keep us updated on your progress.  If you want to do a little search and you find an electronics supplier who you think can supply what you want, but you'd rather check, then post the links here and I'll check the products out for you.

Hope I've been of help

Brian

[McTrinsic]

Rapid Electronics can supply a TTL Oscillator module which runs at 100Mhz, but it's in the 8-pin-DIL type package, not the 14-pin-DIL that you're talking about.  [...]

Uhm... are really talking about this one?? If I look at the back of the board, I see only four "legs".

Before we delv into that though, I have serious doubts about the chances of this working.  If your accelerator has a 50Mhz clock but the 68030 on board is only being clocked at 25Mhz, then somewhere on the board there must be a 2:1 divisor for the clock frequency.  Most probably you can change that divisor to 1:1 and that would be a much better option.  However, since I am not familiar with your particular board I can't really comment on how or where this is done on the board.

Yeah, that would be groovy. I had hoped someone would be able to do this.

The problem you've got is that you don't know what the clock is actually doing.  For example, the 50Mhz clock could be clocking bus speeds at 50Mhz for RAM access and things, but only clocking the 68030 at 25Mhz.  So, if you go and wap a 100Mhz oscillator in there, you'll be clocking the 68030 at a nice, safe 50Mhz but the bus speeds will be running in overdrive.  This is why finding the frequency divisor and changing it would be a better, safer option here.

See above. I do know that is the "system" speed of the oscillator, though.

Anyway, I'll keep looking at electronic shops.

Thanks a lot for your help, though!!

I'll keep you updated in case I am able to make some progress.


Have fun,
McTrinsic

[Brian Hoskins]

Ok, a little explanation is required on the oscillators then.
Most Amiga accelerators that I know of use either an 8-pin DIL TTL oscillator or a 14-pin DIL TTL oscillator.  The 8 or 14 pin actually reffers to the package type, but both only have 4 legs that are used.  So for example, the 8-pin DIL type will slot straight into an 8-pin DIL socket, but of course only four legs are actually used on the oscillator so the others would have no connection.

So when I say 8-pin DIL or 14-pin DIL, what we're talking about is the size of the oscillator.  The small square ones are the size of an 8-pin-DIL and the rectangular ones are the size of a 14-pin DIL.

I hope that explanation clears it up for you!!!

If you're emailing any Electronics suppliers you need to ask them if they've got a 100Mhz TTL Oscillator in the 14-pin DIL package type, and to provide you with a link to the relevant page of their online catalouge.

Brian

[McTrinsic]

Conrad.de seems to be well equipped with all kind of these Oscillators.

I'll get one there, and need to find someone who can do this for me

Thanks a lot!!


Have fun,
McTrinsic