29 Jan
2009
29 Jan
'09
11:34 a.m.
--- On Thu, 1/29/09, Jules Richardson <jules.richardson99 at gmail.com> wrote:
I've never seen a commerical one (but then I've never seriously looked),
ut I am pretty sure there was a design for ome in one of the magazines
over here <mumble> years ago. Probably Elektor. Given the time, it
probaly only worked with 2764/27128/27256 devices which have essentially
the same pinout, so telling it what sort of device it was erasing is not
a problem.
Presumably more expensive erasers do things
in-place - i.e.
periodically do a blank-check during the erase cycle?
Hmm, I've never even heard of such a device. Even the professional
EPROM erasers are little more than what I've built, a box with a UV
light and a timer. I've never heard of an eraser in which the chip was
actually connected to anything while being erased.
If a machine like this exists, however, it would be quite cool! But
probably very expensive, and a pain in the neck to use, as you'd have to
tell it what kind of chip you were erasing, and it would need ZIF
sockets and all kinds of electronics to read the chips. From what I rememebr, the cirucit just read through all
the addresses of
the EPROM until all of them read as FF. And then geve <n>
times more
erasure time. In other words what you expect. I think it was built from
TTL (no microcotnroller, no PLDs of any type), so it should still be
possible to make one.
-tony