030 cpu with fpu: Sync or Async?

[HeZoR]

To sync or async?

I have this accelerator:
http://www.amiga-hardware.com/showha...cgi?HARDID=149

It's a blizzard mkII 030/40mhz with 50mhz 68882.

What's the difference if I have both oscillators running at 50mhz, or only one oscillator operated synchronously?

From the manual it says:

FPU-Clock
In position 2-3 the co-processor is operated synchronously, with the central processor clock. If you want to use a co-processor with another clock rate this jumper must be set to position 1-2. For asynchronous operation a second oscillator must be installed.

I currently have an EC40mhz 030 with an 68882 50mhz fpu and I will upgrade the cpu to an fully MMU 50mhz.
The board as you can see from the attachment, has only one oscillator running at 40mhz (so the fpu is downclocked too), that will be replaced with an 50mhz when upgraded.

Do I need only the one oscillator saying 40mhz replaced, or should there be two 50mhz inserted for async mode?

[meega]

blah blah yadda yadda blah blah yadda yadda

Etc.

[HeZoR]

That doesn't answer anything nor makes sense, here:

Processor: EC030@40Mhz or 030@50Mhz FPU: Optional 68882 (PGA and PLCC) MMU: None in EC030s, Internal in full 030s.
It is clearly upgradable to 50mhz.

I like your humor

[joeksterz]

I have tried this before on a different card (think it was csa-mmr). From what I remember running sync made the FPU approx. 5% faster than async. However, 40mhz->50mhz is better than 5%(25% to be exact), so it would be beneficial to run async. I think you should be able to overclock the 030 to 50mhz and run everything nice and fast!!!

[alexh]

Running the FPU asynchronously (faster) will generate more heat and ultimately shorten the lifespan of your Amiga. That's about it.

Overclocking anything other than the main CPU is not worth it. I bet you hardly use anything which even accesses the FPU.

[Zetr0]

@Alexh

looking at the picture the FPU (an XC68882@50) is already rated for that speed, I think its the 030 he has thats a 40mhz component.

To be honest, the removal of the 40mhz Osc and replacing it with a 50mhz half can (8pin DIL) unit would do the trick - I would also recommend atleast some passive cooling from a heat sink or if in a tower - lump on some active cooling like a heat-sink and fan combo.

Surprisingly a 40 - 50 mhz CPU upgrade is in fact nearly a 20% performance increase. (from about 7.6MIPS to 9.1 MIPS)

[HeZoR]

I'm going to upgrade to an 50mhz CPU with MMU support. So no overclocking here.
My question was, do I need to run them with different oscillators, both rated 50mhz (async) or one 50mhz (sync)? My card now has only one oscillator rated 40mhz that would be replaced when I'll upgrade the cpu. Do I need to fit another oscillator for the fpu (async)?

[Paul_s]

Is that corrosion I see on some of the solder joints?

[meega]

Originally Posted by HeZoR

I like your humor

That was a good response.

You only need one crystal to run everything at the same speed. Just remove the 40MHz and replace it with a 50MHz.

[HeZoR]

Originally Posted by meega

That was a good response.

You only need one crystal to run everything at the same speed. Just remove the 40MHz and replace it with a 50MHz.

I guess so, running two crystals at 50mhz is meaningless...

[HeZoR]

I've replaced the 030/40mhz no mmu with an 030/50mhz that should have internal mmu, but using the WhichAmiga command say's there's nommu. Why is it that is it now shown, my card is supporting mmu, according to this http://www.amiga-hardware.com/showha...cgi?HARDID=149 MMU: None in EC030s, Internal in full 030s.
Do I need a blizzard mkIV for MMU?

Here's a photo of my card:
https://secure.flickr.com/photos/hez...n/photostream/

[roy bates]

try mmu libs to turn it on,its defualt is probably off.


then run a cpu test program.


i can also see you have the jumper installed (maprom disabled i think)try it without it.

[HeZoR]

Ok I will install the mmu libs and run sysinfo and whichamiga, or other software to test it?
Which jumper is the maprom? I've got one jumper removed, but I must find the manual for the right jumper settings again. Also the scsi kit is connected.

Originally Posted by roy bates

try mmu libs to turn it on,its defualt is probably off.


then run a cpu test program.


i can also see you have the jumper installed (maprom disabled i think)try it without it.

[roy bates]

just make sure you read the docs for the mmu libs on aminet as theres a line to add to your startup

[HeZoR]

Originally Posted by roy bates

just make sure you read the docs for the mmu libs on aminet as theres a line to add to your startup

Ok installed mmu libs, nothing changed, didn't read the docs, but proceeded with caution installation
Showconfig says CPU 68030/68882fpu/68030mmu
Sysinfo says mmu found but not used
WhichAmiga says no mmu.
suggestions?

[roy bates]

i cant remember exactly what i did,but its a case of entering a line to your startup to eneble the mmu.best to read the docs.

with whichamiga, i dont know i dont use it.


if you use the mufastrom function i should turn on the mmu as it uses it to patch the roms to fastram.

[HeZoR]

Reading the docs , it says I need to patch the setpatch command to use 68030 mmu, but only if I have the exact setpatch version needed to patch!
Can you provide the right setpatch for 3.9 030?

[roy bates]

i'll have to read the docs.

that cant be right can it?,it shouldnt just work on 3.9 only.

[HeZoR]

Originally Posted by roy bates

i'll have to read the docs.

that cant be right can it?,it shouldnt just work on 3.9 only.

dunno what's the right setpatch to work for the mmu, it's the only thing that needs modification thru the docs it says you need to update a version of setpatch to enable mmu, but OS3.9 shouldn't need such a patch on setpatch right?