On Aug 6, 2017 08:20, "dwight via cctalk" <cctalk@classiccmp.org> wrote:

I wonder if they can be reset by just removing the bias magnets.

The bias field is needed to maintain the domains in the material.

With the Intel bubble parts, if they get erased, you have to use special
electronics and procedure to recreate the seed bubble.  The later Intel
parts added a "Z coil" specifically for fast bulk erase, desired for
military use.

TI doesn't document any procedures for recovery of erased or corrupted

Of course, that might make them totally useless.

It might, but if they're already useless that's not going to be any worse.

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