At 04:32 PM 5/29/97 GMT+0200, you wrote:
>Hi,
>
>I bought a few JW devices (x54,x56,x57) about two years ago.  These
>devices erased in about 4 minutes under my eraser.  Recently I
>bought another x57 and this chip takes 12+ minutes to erase under the
>same lamp!  Is the part suspect or have Microchip made their devices a
>bit harder to erase in the last two years?

Look in the window and compare die sizes.

Andy

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Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 USA
              Electronics for Industry & R/C Hobbyists
         "Go fast, turn right, and keep the wet side down!"
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