On 12 May 2011 07:24, Jason White wrote= : > =A0> Harvesting generic electronic parts from old equipment simply isn't = worth > it >> today. > > I have to disagree if your broke, (though it is far more convenient than > sorting/testing piles of chips) I currently have about 30 eeproms/flashes > and about a dozen ram chips from desoldering. Used works just fine in a > non-production environment. > >> These could be in-house part numbers. > > Thats what I had though originally, but its better to ask around a bit > before tossing the chips. > > On Wed, May 11, 2011 at 8:07 AM, Olin Lathrop = wrote: > >> Jason White wrote: >> > Recently I desoldered several old PCB's I got around 25 mysterious >> > chips that seem to be manufactured by Texas Instruments. They are >> > labeled 81C285T on what (usually) is the part number line and 210895 >> > on the date line (August, 21, 1995) in a 16 SOIC package. I also got >> > what i apparently a pin for pin compatible chip marked as INB627, >> > 1821-0895, by Motorola? from an identical PCB from another [same >> > model] board. >> >> These could be in-house part numbers. =A0Large companies will usually ha= ve >> internal part numbers for every part they use, and sometimes get the >> suppliers to label with these part numbers. =A0If that's the case, you'r= e >> probably out of luck. >> >> Chips from old boards aren't likely to be all that useful for stuff you >> want >> to do today, even if you can find the documentation and the chip didn't = get >> damaged in the process. =A0You might find some 74xxx series logic chips,= but >> you hardly use those anymore today and you can replace them with known >> working ones for a few 10s of cents at worst. =A0Any programmable parts = will >> be so archaic by today's standard that you'd be better off getting a few >> free samples of something modern from Microchip. >> >> Harvesting generic electronic parts from old equipment simply isn't wort= h >> it >> today. >> >> >> ******************************************************************** >> Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products >> (978) 742-9014. =A0Gold level PIC consultants since 2000. >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > Have you tried to get a service manual for the equipment? Some are impossible to source, but others are available off the web, particularly for obsolete equipment. Even a slightly different model of about the same age may assist. This might not only give you schematics, but some have a parts list with partsdescriptions. RP --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .