fusion forty problems

[pyrre]

I have a fusion forty that is malfunctioning. It boots up and shows the kickstart screen. sometimes it even loads WB...
However the times i have it to load WB and run sysinfo on it it is slower than a standard A500...
At first it runs "great" but it rapidly gets slower til it crashes...

Could this be a worn out crystal, or a damaged CPU/card?

[pyrre]

I would try cleaning any contacts, and checking the PSU.

MotherBoard of A2000 has just been cleaned up... Vas corroded from battery leakage. No contacts or circuits are broken, as I can see...
PSU is standard A2000 PSU. and it provides the correct voltage...

The fusion gets progressively slower after bootup.
But the psu shows the same volts. (minor changes)

[pyrre]

I'm guessing you fooled with the card's boot options, and have latest ROMs? Will it goof off if you run the system straight from floppy (no HD attached)?

The Fusion forty does not have HDD controller...

[pyrre]

Check that the CPU heatsink is attached properly and that the fan works.

Heatsink is is properly seated and the fan is working. No dust in the sink as well... Have wacumed it...

Also check the onboard RAM.

Four megs is installed. Have tried both upper and lower banks. Same result. Four megs should be sufficient to boot the system properly. Hower. the ram is not identified and mounted correct. They do not show up, no matter upper or lower bank...
I still have no answer to whether it is autoconfiguring.

Also check that you have the latest plug-n-go Roms (v3.4).

All four plug-n-go roms are 3.4
Swapping sockets; will that make any difference?
Or are all the same?


My best guess is that the crystal is dying....

[pyrre]

Thanx Miked, it may help. That means i am for the look for a newer Gary chip....

[pyrre]

 :bump:

[pyrre]

I have one and it indeed does autoconfig the memory. I have 32mb on mine.

That is good to hear. Because i gen no ram added at all. there are four simms installed and the seller told me it is four or eight megs in total of four simms. Have tried them in upper and lower bank to no result.

Make sure you have the correct 68040.library for it.

If i would get as far as the WB screen it would be nice. Loading the WB gets increasingly slow. Till everything hangs. Cooling is great, fan is running and all the powers are as it should.

I would also clean all contacts and reseat the PNG Roms.

Have reseated all the chips on the card. one by one.....


My question is still: could it be a malfunctioning crystal oscillator?

[pyrre]

Heat is something i am concerned about too....
But the sink is glued to the 040 and i don't want to put any stress to it removing the sink.

I have downloaded the software disks from here


The simms have eight chips on them.
However, reading the size of them is a whole other story...
They are labeled: mcm84000as70 and the chips bear the Motorola mark...

EDIT:
After removing the sink and the thermal compound, i see that it is a XC68040RC25. The serial suggest that it is supposed to run @ 25Mhz... ant this card is clocked to run 40...
(according to the seller)
How can I slow it down?
Is that a matter of swapping the crystal?
(it is clocked to 56Mhz)

[pyrre]

quick question, how much do these run for nowdays? I got one that I may be selling (w/ no memory).

Without memory, not much... All my reading tells me it has to have at lest 4 megs to work properly. And simms for this card is HARD to come by nowdays.
Fully populated with 32 MB ram and the 40MHz version....
That is one i guess you can get a great deal for...

[pyrre]

There is no 40mhz version, the forty in fusion forty refers to the 68040, this card was made in 25, 28 and 33mhz versions but I doubt if there were any 25 mhz versions made, they jumped straight to 28mhz.

The BBOAH states otherwise....

[pyrre]

Hello.
I thought this tread was dead...  :-(
I will replace the heatsink on my FF, and try cleaning and reseating the socketed chips...
ATM i am working on my A500 and have not yet attempted doing anything on the a2000... Still trying to get hold of a cpu socket IDE controller... (scraping together some money at first)

@CLS2086
Nice work you have done, i will (when i get to the A2000) try to see what i can do with my Fusion Forty...

[pyrre]

An aged old thread...
But i have found a probable reason to why the fusion forthy does not work in my amiga 2000.
My amiga 2000 is a rev. 4.0 motherboard. And most likely not compatible with any accelerator made for the cpu fast slot.

Anyone got any A2K motherboard for sale?

[pyrre]

Commodore modded many boards up to 6x.. you can prob. mod your board to at least 4.5 and all should work.
rev4.0 was pretty bad compatibility wise.

Not sure if it applies, but there were 2k refresh(common mac simms) and 4k refresh simms and the FF may be picky about this.

The early A2000's had a buster chip made by toshiba, some of these were problematic, replace with the CSG version may help

Not sure how you would attack the rev 4.0 MB for upgrading it. It lacks some of the more modern logics. as far as i can tell, there is no buster chip on them at all...