Problem erasing & re-using GM Proms

[ECMnut at aol.com]

In a message dated 1/5/01 9:10:13 AM Eastern Standard Time, sailors at mwci.net 
writes:

> 
>  Older EPROMs used to have a Vpp pin in addition to the Vcc. The Vpp pin was
>  a programming voltage pin, voltage was applied to that pin only during
>  programming, not during normal read type operations. Newer chip designs
>  simply the interface by incorporating a programming voltage generator
>  circuit inside the chip, then the Vcc is the only power the chip needs.
>  
>  More than you wanted to know?
>  
Not at all!  Thanks Dave,
Mike V
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