>  What's the real difference between PIC16F84 and PIC16F84A or 12C508
>  and 12C508A. What means the letter "A" in the end??

1. read the data sheets
2. AFAIK no much diff between the 12c509's
3. quite some diffs between f84 an f84a: a runs up to 20 MHz, lower max
voltage on RA4

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