Are old Texas Instrument eproms shit?

bustedstr8

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I don't know if it's my Wellon 490 or that if older TI eproms just die earlier than other brands.

My batting average with TI chips is probably 15%

I have tried 240, 512, 010, 040 and the all seem to crap out after a few bytes.

The 010's seem to behave better and I might get 30% of those to program.

Anyone else have bad luck with TI?
 
Nope.

I use a TopMax and a ChipMax from eeTools and they just work. :)
 
Never had an issue with them. Fujitsu eproms seem to have a high failure rate compared to others from what I have seen.
The older TI logic and ram chips with the silver plated legs are crap. The legs rust off of them. The chips themselves were fine, its just the package.
Sounds like you need a better programmer or a different source for eproms.
 
Could be that your programming software is using the wrong algorithm to program them or the wrong voltage.

My programmers will do the ST versions of the EPROMs MUCH faster than the TI ones. Maybe your programmer is trying to do them too fast?
 
You always need to verify the voltage the programmer chooses against the chip markings. Too low and it won't program, too high and zap. Also for very old chip select the slow program option.
 
I have tried 240, 512, 010, 040 and the all seem to crap out after a few bytes.

The 010's seem to behave better and I might get 30% of those to program.

You always need to verify the voltage the programmer chooses against the chip markings. Too low and it won't program, too high and zap. Also for very old chip select the slow program option.

True, but the OP's complain wasn't really about what I'd call "old" chips. Those (TMS27C240, TMS27C512, 010 & 040) are all after programming voltage was standardized to 12.7V. Those are all fairly "new" in the history of EPROMs...
 
I looked into the programmer options and I have one for slow read/program. The next batch
of TI chips I'll try with the slow option enabled.

Thanks for the tips :)
 
I looked into the programmer options and I have one for slow read/program. The next batch
of TI chips I'll try with the slow option enabled.

Thanks for the tips :)

I used to run the previous version software for mine since it burned slower so I had a better success rate. Now I'm on Vista so I'm forced to use the newer version, works ok I guess.
 
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