Hi Manual,

The only issue that I know of is with the FSR register.  In the 12C508, the
most significant three bits are always set, in the 12C509, it is the most
significant two.

When bit 5 of the '509s FSR is set, you will go through a "Shadow" copy of
the CPU registers and shared registers.

So, if you are using the FSR in the '508 and have implemented a ring buffer,
you will have to modify the code for the '509.

Good luck,

myke

>Hi,
>can i programming a PIC 12C509 with a Programm for
>the PIC12C508 ?
>Is there a modification to do ?
>
>Thankx in adevance !
>
>  Manuel
>
>

"If people don't know what you're doing, they don't know what you're doing
wrong." - Sir Humphrey Appleby K.C.B