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[orange]

I have installed BVision in desktop A1200 (and added heatsink+fan, PSU on FDD port), but there are problems. After a while system (OS3.9) freezes, and sometimes in early startup I see strange screen like blue chessboard. The PPC without BVision worked fine, what could it be?
It seems to me that the floppy PSU connector might be problematic (hoping that bvision is not broken)..

[countzero]

did you do the boing ball updates ? latest cgx ? bppcfix (disable onboard 68060.library and ppc.library) ?

[AmigaMance]

You are right to correlate the system freezing problem with the BVision. I also get this when i don't cool down the card well enough or when i set the MELTDOWN tooltype too high. Thus, at least in my case, it's a heat related problem. The floppy PSU connector doesn't improve it. Are you using thermal paste between the Permedia2 and the heatsink?

[orange]

thanks for replies
unfortunately its not just the libraries, as sometimes it occurs on cold boot in early startup menu. (although, I haven't install any drivers yet, it simply passes AGA by some magic)
I have put the heatsink that has selfadhesive bottom, this one. I did once operate it for a while with no fan, hope that hadn't fry it.
still hoping about that floppy connector as situation changes if I move it before powering.

edit: forgot to say, the heatsink has been hacksawed in order to fit without removing A1200 metal shielding; only Permedia2 chip has cooling, all other bvision chips don't even have heatsinks.

[Framiga]

i have exactly the same heatsink installed.

40 degrees C without fan

29 C with a small 5v Sunon 40x40

[orange]

well, I replaced the floppy connector and it seems much better now. (also added df0: but that probably wasn't important)
:-) :-) :-)
even managed to boot into OS4 with bvision.

BTW, do the two other chips (besides Permedia2 and RAM, on the right) really need extra cooling? it would be hard fitting any extra fan in there because of floppy drive and VGA cable.

[rkauer]

Better just put two small heatsinks over them "just to be sure".

[delshay]

do the two other chips (besides Permedia2 and RAM, on the right) really need extra cooling? yes.

this also applies the Blizzard PPC,which has four micro chips which also needs to be cooled down plus the PPC processor. 680040 also needs to be cooled down.

[delshay]

AMIGA OS4 USERS:

iv also recived OS4 ( yet to install ),in the manual its states you should switch RAM settings to 70ns. this is to protect your cards due to extra heat.

but with the above RAM settings this must slow things down,but it should work with RAM settings set to 60ns or even better **no-precharge**.

please note i have not yet tested the above settings with OS4.

** WARNING** do not try the above RAM setting without proper cooling,this may also applie to to the RAM module ( simms )

**BLIZZARD PPC TESTING **

during many years of Blizzard PPC card testing iv found *no-precharge* RAM setting works best on OVERCLOCKED system with a higher OSC.

the higher the OSC,then *PPM* also comes important due to timing issues.

iv found there is little to gain on anything above 270Mhz PPC with 70ns ram setting. infact iv found it to be worse than say 268Mhz with RAM settings set to *no-precharge*

[orange]

um.., how do I know if its set to 60ns or 70ns?
I never used any PPC settings.

[nine3o]

If you hold down the ESC key when rebooting or first powering on your Amiga it will bring you into the PPC card settings, in here you can change your ram speed (among other items, like if you have on board SCSI)

[AmigaMance]

@delshay

do the two other chips (besides Permedia2 and RAM, on the right) really need extra cooling? yes.

Although they do get somewhat hot, i haven't apply any form of cooling on them and i don't think that i have any sort of problems with this.. So, perhaps the word "need" is not the right one. Perhaps it's more proper to say that it is recommended to cool them down.

iv also recived OS4 ( yet to install ),in the manual its states you should switch RAM settings to 70ns. this is to protect your cards due to extra heat.

I doubt that the 60ns setting produce any significant heat increase. I think that they recommend to switch to 70ns, to avoid instability with some bad SIMMs.

[delshay]

Although they do get somewhat hot, i haven't apply any form of cooling on them and i don't think that i have any sort of problems with this.. So, perhaps the word "need" is not the right one. Perhaps it's more proper to say that it is recommended to cool them down.

you & all others that use Blizzard PPC are taking a risk & the life span of the cards will be reduced. the micro chips operates very hot is also present on the Bvision.

the problem with the Blizzard PPC is this chip is present both sides of the board. this increases heat on both sides of the board ( TWO ARE BACK TO BACK ) there are three,in total. to make matters worse one is covered by the heatsink.

this makes the temperture of the chip under the heatsink rise even higher & can desolder itself as it is hanging fron the board ( THIS APPILES TO TO DESKTOP A1200 OWNERS ).

most Blizzard PPC failed due to to heat to surrounding componets. ( correct my spelling later have a few beers ).

-----------------------------------------------------------

I doubt that the 60ns setting produce any significant heat increase. I think that they recommend to switch to 70ns, to avoid instability with some bad SIMMs.

you are correct with the above,but it still stands. the PPC chip will be running at *full* speed due to no switching between 68k & PPC more heat will be produced. when switching from 70ns to 60ns will also produce more heat & more power will also be needed,the whole system is running faster.

correct me if im wrong.

[orange]

@delshay

we are talking about the two chips on BVision, not the BPPC

[delshay]

we are talking about the two chips on BVision, not the BPPC

i give up. lets try another test.

CHANGED NOTES: i will post temp readings of both mico chips on Bvision.