Resent with a TAG this time...

I'm building a PIC circuit to interface to a very old computer that uses
0v for "1" and -10V for "0".
(http://www.youtube.com/watch?v=8EKBNfm5B4U)

It will make for simpler interface circuits if I run the PIC from 0V and
-5V.  (I.E. 0V on Vcc pins and -5V on Gnd pins).   

Are there any issues with doing this ?  

PeterO


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