Re: overexposed CMOS EPROM



orange wrote:

On Aug 2, 5:10 pm, Eeyore <rabbitsfriendsandrelati...@xxxxxxxxxxx>
wrote:
orange wrote:
well I've done it, I apparently overexposed the EPROM (27c400) by UV
lamp. (now I know there is such thing)

How long did you give it ?

Graham

I think about 4(min) (the scale is not labeled it goes from 1 to 10).
but I have exposed it twice in succession. the window was dirty and I
wasn't aware of the danger.

8 mins isn't going to break it by miles. I bet it's barely erased it.

Does it blank check ok ?

I used 30 mins as a typical erasure time. If in doubt an hour won't hurt.

Graham

p.s. if you can find a suitable programmer (see ebay) flash is SO much
better.


.

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