eprom is out of a '7747. I like to zero out them out before they go into my eraser. However this one cannot be written to, which leaves me afraid that if after it is erased, it will not be writable. (currently it has has factory 1990 5.0L TBI image)
When flashing these 7747's 27c32, any special voltages needed? Never had this issue before but I know there are some older eproms who require high voltage to burn.
Any thoughts?
1990 GMC C1500, 5spd, 1993 LT1 (ECM 16159278 $DA3)
Why not try erasing it first, then read it, to see that it is erased?
The man who says something is impossible, is usually interrupted by the man doing it.
Well right now it's a working computer/eprom that I'm selling here on the forum. I'll ask the buyer if he's ok with me trying this, with the warning that I might not be able to write to it again.
I dont have another 27c32 to spare.
1990 GMC C1500, 5spd, 1993 LT1 (ECM 16159278 $DA3)
Ok, if you're selling it, why are you trying to erase it? huh.gif
The man who says something is impossible, is usually interrupted by the man doing it.
He asked to make a small change and trying to be nice, I stupidly said no problem. I'm communcating with him now though and it doesn't seem to be deal breaker.
Just seeing if there was anything special to know about for these particular eproms.
Last edited by bentrod; 08-08-2013 at 09:05 AM. Reason: added the trying to be nice part O:-)
1990 GMC C1500, 5spd, 1993 LT1 (ECM 16159278 $DA3)
How do you zero them out first before erase? Didn't think you could change anything without UV erase?
I'm not familar with 27c32? I use 2732a chips from ST which need 21 volt. I forget what stock chips are? AMD? Voltage? It's always best to have the data sheet for the chip to get specific voltages.
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
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