Re: Help Identifying three IC's

There are some PC-based chip testers that can do this; I use one at work
often. But the chips need to be working, and must be physically removed
from the circuit board and placed into the tester's socket. Even then, it's
not always 100% accurate. It'll give you a good ballpark starting place.
There are several instances of different TTL chips doing the same job and
having the same pinout (such as 7404 and 7414), but the tester won't be able
to tell the difference. It also won't be able to differentiate between
standard TTL, LS, C, HC, and so on.

This is the tester's so-called "auto-locate" function. It can also test a
TTL chip if you enter in the real part number, but even then it's not 100%
accurate. I once placed a 7400 chip that had an input shorted to ground,
and the tester thought it was good! (All test equipment will lie to you at
some time or another.)


But there's a chance that the manufacturer may have printed the chips' part
numbers on the underside of the chips. They do that sometimes, and whoever
sanded off the numbers from the top may not have done so to the other side.


.

Relevant Pages

  • Re: Testing NTE 2107 memory chip
    ... waster. ... light thing untill I get the bad chips in my hand. ... You might have to build a tester, perhaps one just for these cards. ...
    (sci.electronics.components)
  • Re: manual for fluke board tester..
    ... model 90s, never could find books for them, did you try John Robertson? ... tester. ... what will it test for chips?? ...
    (rec.games.video.arcade.collecting)
  • Re: Any CBM equipment standard components?
    ... Not that I doubt it can be done, I mean all chips are designed ... designed out of plain transistors or vacuum tubes. ... It requires quite a few TTL chips, but it is not a dramatic amount, just take a look at the schematics of the early PET's. ... No need to design such a thing yourself, VHDL code for for example the 6845 can be found on the net. ...
    (comp.sys.cbm)
  • Re: ZX Projects: hardware (and sometime software) projects for the ZX Spectrum
    ... circuit which requires two 74LS02 and one 74LS05 to connect a ... self-made keyboard to the Beloved, and I'd like to build it. ... you can get away with replacing 74LSx chips by 74HCx ... have quite a stock of TTL chips. ...
    (comp.sys.sinclair)
  • Re: Haunted House Sound Help!
    ... you may very well be correct about the 6502; in my opinion it would behoove ... picture you are describing, as well. ... Because both chips are socketed this ... with System 80 control boards these TTL chips can drag down 6532s, ...
    (rec.games.pinball)