Hi,

> Secondly, I tried programming a couple of the windowed 16C63 devices
> with the configurations bits set to enable code protection.  Now
> everytime I try to use them, they are not blank.  I thought these
> devices were fully erasable, but it would seem I was wrong ? - Have I
> now rendered these devices totally useless ?

Yep, Microchip covers the code protection fuse with some sort of mask to
block out UV.  I guess this is to prevent someone from taking a laser and
clearing only the CP fuse, thus unprotecting the PIC.  I do not know of
any way to erase that bit now.  (IMHO they should actually have omitted
the CP fuse in the JW devices since accidents do happen!  You only use
them for devlopment anyway.)

Niki
steenkmp@sun.firga.ac.za