I was having trouble erasing my 27sf512 chips after burning them until i stubled accross some false information that led to my discovery of good information.

If i put a blank chip, never been burnt, in the burner and then erased, it worked fine, but if i programmed the chip i was unable to get them to erase. I found a thread on a camaro form to pull the safety jumper and set the eprom to W27C. This didn't work either, so on a hunch i reset the burner and just tried erasing with the jumper out and it worked.

So for those of you using enhanced buners with sst27sf512 chips: burn with safety jumper in, erase with safety jumper out.

 

i've been having the same problem it keeps reading error. where is the safety jumper? it wont allow me to erase and re-write

 

that button does wonders if clicked .

no but for real there is a few topics that explain it pretty good. just search for 27sf512.

 

safety jumper is on the top between all the led's. Mine is yellow.