Full 68060's 75Mhz for sale

[alexh]

Freescale (formally motorola) dont make and have never made FULL 060's at 75MHz

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MC68060&tab=Buy_Parametric_Tab&fromSearch=false

Where are the photographs of such chips? (In focus so I can read the numbers on the chip).

The MC68060RC50 with mask E41J has been known to overclock to 100MHz (No Amiga Accelerator can run that fast).

The very last version of CSPPC as been known to run at 75MHz with jumper changes and firmware settings and an extra crystal.

Apollo 1260 is also known to run at 75MHz with these chips, but the memory controller design means that it doesnt run much faster in real terms.

[alexh]

At this point in time, with the information I have (the photo and the details given) it is my opinion the chips you have bought are fake. Why?

The photo is fake.

Motorola never made any MC68060RCxx chips with the mask number E31F. As has already been said the E31F mask was a very early XC68040RCxx mask number.

The chip labeled MC68060RC75 01G65V is fake.

G65V is a REAL 060 mask number HOWEVER no 68060's were manufactured with the MC notation and the G65V mask number. MC status was only awarded later. Also I am almost sure no XC68060RC75 chips were made either.

While OK the XC68060RCxx (G65V) is no competition to its successor the MC68060RCxx E41J version released 2 years later. The G65V variants produce much more heat and do not like higher clock rates as they are a larger geometry, less efficient etc.

[alexh]

EC parts were not (until later) a separate mask.

When chips are made a certain number of them are faulty.

To find the faulty chips they all go on a tester which runs some test vectors (a bit like programs). Not only can they discover faults, but they can tell where in the chip the fault is.

If a fault is discovered but it is say limited to the MMU, or FPU and the rest of the CPU is fine, rather than being binned it is separated and branded EC or LC and sold to a different market (Washing machines etc). This can seriously increase a semiconductor's yeild (the percentage of viable chips) and thus profits.

Often demand for EC or LC parts would outstrip the number of faulty parts being found and in that situation Motorola would sell fully working ones as EC instead.

It is a lottery as to whether an EC part will have a working MMU.

Later to save money I *think* they made specific LC and EC parts which physically didnt have an MMU or FPU and had a smaller die.

Even then if stocks of full 68060's were running too high, rather than make some more EC/LC chips, they would sell rebranded full ones if it saved money.

I hope that explains why your EC part has an MMU.

[alexh]

Yeah, that was the time when demand for EC/LC parts outstripped the supply of faulty chips.

Time on the tester is a key part of making money in the semiconductor industry. If you can shorten the time a chip spends on the tester you can sell more chips and increase revenue.

By removing the MMU/FPU test vectors for chips Motorola KNOW are going to be branded as EC or LC then they improve revenue and profits.

[alexh]

This website appears to be the source of all the material about the imaginary MC68060RC75.

As you can see (even with the bad google translation) that even they admit it is FAKE and they were conned by some rogue trader.

[alexh]

If you have a scanner, that could take good snaps.

[alexh]

Yes.