that link shows how to build a socket,but i dont like that idea.
the problem is when the CPU is going to be removed it can put a lot of stress on the outer pins and can or may removed the pads from the PCB.
When I designed that concept of a PGA socket using individual pin sockets, I did consider the stress on the pads. The Precidip part no. 714-87-164-31-012 data states the removal force as 0.4 N (typical) for each pin. Any one pad is easily strong enough to tolerate this upward force.
Not sure why you mentioned that the outer pins would have more stress applied to them, are you not using a PGA extraction tool? Most of these tools apply *downward* force to the outer pins, so if anything, these are under the least stress during removal.
As it has already been mentioned, it would be best to be able to solder the CPU directly to the board (higher reliability and it lessens the chances of the average punter messing with it), but obviously you can't do this due to the BGA footprint.
Unless you have access to a BGA replacement station and an X-ray machine to inspect the final joints, replacing the socket with a BGA type is not really an option.
If you have a suggestion of how to improve my socket implementation, I'm certainly open for ideas.
Advantages of individual pin sockets:
- Easy to obtain
- Each joint can be 100% visually inspected
- Unsoldered joints are obvious (the pin falls off)
- No specialised equipment required to fit them
The disadvantage is that it's crutial to align each socket perfectly, which takes a high degree of soldering ability.
Make a volt mod, the 68060 can tolerate an absolute maximum 4.5 volts as supply
Where did you find that detail? The 68060 datasheet I have specifies the maximum supply as 4.0V. [Section 12.1 - Maximum Ratings - Supply Voltage] Have you checked the supply voltage range of the other devices on the board which are powered from the 3.3V regulator?
with EXTREME speeds the logic chips need voltage near their operating voltage ie 5v if it jrops to say 4.92 4.93 it starts to lock-up to be safe it must read 4.98 and above
The supply to a CMOS device (and it's temperature) affects the propagation delay through the device and the output transition time. If you're talking about 50mV power supply variation before problems occur, it doesn't sound like a usable situation. Even good power supplies are specified for a load regulation of 3-5%. So best case, you need to expect a supply between 4.85 and 5.15V.
With the scarcity of good accelerator cards for the Amiga, I would be too worried about ruining either of my Phase5 CyberStorm PPC cards or CyberVision graphics cards by overclocking them. That plus the fact that there are so few repair shops that will work on them if I do damage mine and parts are getting harder to find to make any repairs.
Thanks, the best statement so far. I've lost track of the number of Cyberstorm boards I've repaired, only to get an Email back a few weeks later saying that the owner has overclocked it (against my advice) and the board no longer boots. You don't get a second chance after you've killed the programmable logic, the images to program new ones are not available, so you can kiss your hardware goodbye.
Why is it that device manufactures go to great lengths to generate operating parameters and limits?? So that you can operate the thing without killing it!
