68040 3000 you can bake cookies on

E249: The Amiga 3000 gets its own 68040 with a recent purchase of another 3640 accelerator card. the cpu heat sink is too high of course. and while it "works" somethings up. one of the Gal chips clocks in at over 366 degrees F! you can bake cookies on her. this causes instability to say the least. heres how i fix it in this two part episode.
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[@router5840]

I could watch you videos all day very interesting.

[@allan80supra]

couple of options, use a solid aluminium block between the 040 and floppy tray, dump the heat into the chassis or Remove the 2nd floppy, cut a hole in the tray above the 040 and then mount a fan above it.

[@markpstapley]

Unless you have Dextrocardia, the ESD strap should go on your right leg and not on your left, just in case you somehow manage to touch something high voltage....

[@jimmihenry]

I learned not to put in used untested crap into my precious rig. It may go up in smoke! Cheers. And as always thumb up :)

[@cullmaster7361]

Another great vid Chris 👍🏻 Don’t own a A3000 (But do own a A4000 😉), as for the overheating 68040 a couple of suggestions. Card isn’t getting more than 5V for the CPU? The heatsink is fitted correctly? Maybe you hit the nail on the head with the amount of CPU paste, maybe it’s just covering the outside of the heatsink and NOT properly in the middle? I know back in my days building PC’s if you didn’t set the paste properly the Intel and AMD chips would just overheat and with the PC having Thermal protection would just shutdown.

[@mikerhodes9198]

With those kind of temperatures I would consider a TEC to keep things cool.

[@db_37205]

Good educational video! I would have not thought to grab a temperature probe. Don't the newer GALs run cooler?

[@jjdigitalvideosolutionsllc5343]

Air intake is the rear side, opposite the PSU. It flows around the expansion cards, thru the notched areas of the daughterboard, then over the drive bays & processors and out the PSU (assuming your fan is not one of the reversed ones). I think the vent on the lower front bezel is more decorative than functional. When I ran my CSPPC in the desktop A3000, I sacrificed a drive bay, cut a hole in it to accommodate the heatsink & fan. I sold it when I upgraded to an A3000T. Always wondered what became of my old A3000D. If you bought a used one, painted black, with a hole in the drive bay and a ROM tower, let me know how she's doing.

[@lg.bus114-Mario.]

Tnx Mr.Chris ! :)

[@a4000t]

Back in the day,i ran a A3640 in my 3000 i removed the heatsink, got a 1/4" thick fan and put it on the 040 with dabs of silicone on the 4 corners leaving a tiny gap between it and the chip, that machine ran 24/7 and never missed a beat. The Pals do run hot,but wow.. Shorted cap causing hot pal?? Also remember the 3640 with dmac2/ramsey4 combo doesnt like sczips(zips end in 402 number) in the first ram sockets,it needs page mode ram in first sockets(zips # end in 400). all ram will run in page mode regardless. i can attest changing to gals is great they run nearly cold,but the 3640 is a POS anyway. Also check for broken/shorted traces under the caps when you remove them,seen this alot!

[@jorgemtds]

Chris, you seemed to have a transistor on your left arm. :)

[@ChrisEdwardsRestoration]

Wire remnant lol

[@ianbasore]

I had a Blizzard 68060 and that thing could melt your face off lol

[@cullmaster7361]

It’s probably because you ran a Revision 1 68060. The latter revisions ran cooler 😉

[@a4000t]

I just added a warpengine with rev6 060 adapter running at 80Mhz with 128MB 50ns ram to one of my A4000's with 3.2 roms and workbench 3.2... All the proper libs are there and such but workbench runs like molassas! it feels like its 030/25 but should be screaming at 80MHZ. scsi is with acard7720u and a CF adapter, its only showing 3.5MB/s! i cant find the trouble,all the hardwares right,sysinfo reports its fast,and whichamiga shows all is good. ITS SLOW and i cant figure out why. i suspect its 3.2...i guess i will chunk the 3.1 roms back in and check it.

[@ChrisEdwardsRestoration]

Did you set your jumpers? Some of the more advanced cards did not need jumpers set from their factory positions…. Mine was slow till i turned fpu to ext then she woke up

[@HoldandModify]

You’re triggering my PTSD. lol! Case closed. Case open. Rinse and repeat.

[@stephenbruce8320]

I can't say I enjoy taking my Amiga's apart and while I have a ton of stuff for them I lack the motivation for some odd reason to install anything new. I would put that board under a Microscope and check everything out. You could always open up the front of metalwork to allow air to flow under the drives. Speaking of drives. Where do you find A3000 Disk Drives these days?

[@ChrisEdwardsRestoration]

Just standard fb354 or 357 hd drives. You could even use converted PC drives for either one as long as you have the metal mounts

[@stephenbruce8320]

@@ChrisEdwardsRestoration I have done the PC Drive conversion in the past but the actually button shape to fill the hole. I downloaded a button file but not really certain it might fit on drives I do have. I guess I could try it out.

[@MrLukealbanese]

Toast 'em Chris !!

[@SorrettuKansa]

Did you have 68040.library installed? At least 3.1.4 doesn't come with the library installed.

[@ChrisEdwardsRestoration]

Of course

[@markdjdeenix6846]

Maybe get a heatsink off a pc chipset or Xbox 2/3 something maybe 15mm high and put a 40 mm fan in the front panel behind the plastic front Do the caps first and test If it’s still an easy bake oven .buy a 40 mm hole saw and strip the system down again 😎so the mother board can’t get damaged and work out the best place to put the fan It is something that you need to measure hight wise Like stand-off and components hight in the area Masking tape helps me on metal Hopefully a recap will work

[@wskinnyodden]

Doesn't MAPROM require FASTRAM to be avalable?

[@ChrisEdwardsRestoration]

Yes. Im idiot

[@wskinnyodden]

@@ChrisEdwardsRestoration question is why did it start working without any changes on the third boot attempt, what the heck prevented the first and kept fastram off on the second.

[@ChrisEdwardsRestoration]

@@wskinnyodden needs a recap, which i do next

[@drzeissler]

I only have an A2000 and the A3000 are so damn expensive....

[@ChrisEdwardsRestoration]

Theyre all expensive

[@a4000t]

I cuss the 3000 case every time i have to go into it,but man you are playing with fire balancing that drive plate up there.. I wont mention a friend who killed a brand new gvp4060 when it slipped and shorted it.. unrepairable accelerator-killed the cpld ;/

[@ChrisEdwardsRestoration]

I like to live dangerously . Lol

[@DAVIDGREGORYKERR]

The MC68040 has an on chip FPU so you can do math intensive calculations, if you are having problems with high temperatures then maybe you should go back to 68020

[@tiannaumann]

What a stupid defeatist assertion.

[@alexquant1335]

@@tiannaumann I was thoroughly entertained by it 😂😂