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China Ebay 68040 processor


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11 minutes ago, Bolle said:

If it's a 060 it will die if you plug it into a 040 machine. If it's a 040 it probably is a LC chip. 

TattleTech should tell you if there is a FPU or not.

Oh dear. Will I risk the LC575 logic board if I try? If so, perhaps I should leave it at that :-/

Would I expect to see improvements in audioediting operations (e.g. in Alchemy) with a floating point unit? Soundfiles are stored as integers in the digital audio formats I assume and not floating points..

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  • 3 weeks later...
1 hour ago, Unknown_K said:

So people are faking old CPU's for collectors who won't be plugging them into a machine anyway?

I've bought several m68040 / m68060 CPUs which were supposed to be the latest mask. Each time, when I've identified them as older, re-labeled CPUs, I've gotten a full refund and haven't had to mail back the CPU. I think most people don't check, or they think they're getting a CPU that should run cooler but doesn't. The bad part is that the sellers never get punished.

 

At least the m68060 tells you its version. There are errata which can be checked for in m68040s, but that's tricky and can only broadly tell you what group your CPU is in.

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  • 2 weeks later...

I'm reading that screenshot the same way as pcamen, that's there's not a separate FPU but there's one on the chip itself.

 

If you have a copy of Metronome handy that will explicitly say whether it's a full 68040 or a 68LC040.  Ditto for Apple Personal Diagnostics, where it will say in the FPU section "040 Built In" if I'm remembering correctly. 

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Go to Norton SystemInfo - It will tell you if there is FPU or not.

 

I did bought an 68040 33mhz off ebay - it was re-masked as 68040 33mhz which it was really an 68LC040 33mhz - disputed it and got money back no question asked as he must've knew that he was selling fakes. That is how I found out it was non FPU.

Cheers

AP

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1 hour ago, razo said:

I got my money back, but the seller is still allowed to continue selling the fake 68040s on ebay and he even wanted me to return it... :vent:

Talk about a kick in the ass. Asking you to return the fake. I'd ship him a cat turd.

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Every 040 has a FPU.  Probably why the software reports hardware FPU present. Technically this is true, the chip has an FPU.

LC's are just 040's that have faulty FPU's that were disabled by blowing fuses on the chip.

This happens during testing. If the chip passes all other tests but has a faulty FPU it will be downgraded.

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8 hours ago, Paralel said:

Talk about a kick in the ass. Asking you to return the fake. I'd ship him a cat turd.

My kitty will volunteer one for you.

 

If you have a good thermometer, measure the idle and busy temperatures of the CPU before you replace. I got a few m68040s which were supposed to be the newest mask which got just as hot as an old early 1990s mask before I finally got a real new one.

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7 minutes ago, paws said:

Well, mine just arrived and it appears to be a genuine full 68040, 33 MHz, according to TattleTech.

 

This was the auction:

 

https://www.ebay.de/itm/361225888013

 

I give them a low offer first, they returned with 43USD.

Cool! It looks just like mine apart from the codes up in the right corner.
Is your TattleTeck screen different from mine?

Edited by razo
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