TF536 IDE speed

[8 Bit Dreams]

IMG_20200626_134640.jpg
Bought from this seller www.ebay.co.uk/itm/143326528869

Congratulations!
You've got a fake CPU, if You look under the scope - you'll see that this is 68030RC25B

IMG-20200624-WA0008.jpg (126.98 KiB) Viewed 3414 times

bought 10 from him - all are reprints, some work @50Mhz, some not, but fact is these are 25B

[PhilC]

If the writing looks too clean then its not a real 50 in my experience.

[terriblefire]

Amazing that the nuts design of the 330/536 will allow those chips to run at all at 50Mhz.

[alenppc]

Amazing that the nuts design of the 330/536 will allow those chips to run at all at 50Mhz.

The 330 was way more tolerant though. But very very few 33s run at 50 on the 536, in fact I have switched now to RC40Cs which seem to do a lot better.

[kulamario]

Grate news lads
Am so happy

[arkadiusz.makarenko]

Amazing that the nuts design of the 330/536 will allow those chips to run at all at 50Mhz.

The 330 was way more tolerant though. But very very few 33s run at 50 on the 536, in fact I have switched now to RC40Cs which seem to do a lot better.

This is what I don't understand.

Is it that CD32 is more tolerant than A500?

[arkadiusz.makarenko]

Yup my cpu is fake as well. My "50Mhz" is 100% reprint as it was extremely easy to remove markings. But can't read what it was before.
Non of my 33Mhz or 40Mhz manage to be stable on TF536

Quest for 50Mhz capable cpu continues

PS
Most of them do work stable on TF330!

[terriblefire]

Im a bit confused about the 330 vs 536 thing...

Mostly because not only is it the same verilog code in both boards but 66% of the traces are identical. Its a literal copy and paste job.

Strange.

[8 Bit Dreams]

Yup my cpu is fake as well. My "50Mhz" is 100% reprint as it was extremely easy to remove markings. But can't read what it was before.
Non of my 33Mhz or 40Mhz manage to be stable on TF536

Quest for 50Mhz capable cpu continues

PS
Most of them do work stable on TF330!

Arek, You managed to buy a CPU with non-existing mask...

Guys, don't worry too much about these fakes, it doesn't matter whats printed on it, only does it work @50Mhz or not matters...

[arkadiusz.makarenko]

Yup my cpu is fake as well. My "50Mhz" is 100% reprint as it was extremely easy to remove markings. But can't read what it was before.
Non of my 33Mhz or 40Mhz manage to be stable on TF536

Quest for 50Mhz capable cpu continues

PS
Most of them do work stable on TF330!

Arek, You managed to buy a CPU with non-existing mask...

Never checked, mask
It is not that I wasn't aware that it was fake when I was buying it. It was too cheap to be true