Brent Hilpert wrote: On 2019-Jul-24, at 10:31 AM, Jeffrey S. Worley via cctalk wrote:
>> Yesterday evening, in the process of refurbishing five very badly >> treated Atari 800 computers I had a hunch and subjected a failed Pokey >> chip (Atari Part CO12294 Wikki link https://en.wikipedia.org/wiki/POKEY >> ) to high heat by way of the barrel of my soldering iron until >> saliva evaporated from it in about 1 second. >> >> The chip, which did not work before in any of the machines now works >> perfectly. > > cross your fingers that it stays working. I performed a fix like this some > years ago with a ca.1970 chip from an SSI logic family from Sony. However, > it reverted to its failed state some weeks or months after the heat > application, long after (obviously) the chip had returned to ambient > temperature. So it wasn't merely that the chip was temperature sensitive, > the heat application indeed must have had made some internal alteration, > but it wasn't permanent. Probably temporarily reattached a bond wire which "re-broke" after a few thermal cycles. Bill S. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
