>        I did read the web page
>
>http://www.finitesite.com/d3jsys/16F628.html
>
>so I know that the 16F84 is obsolete but it sounds like I can go
>ahead and use the few I have since their code will fit in to the
>16F628.


Obsolete is not exactly the word I would use for the 16F84. It is still widely used, and many PIC examples you will find on the net etc. will use it.
It would not be my first choice for most projects if I was choosing a PIC, however there's no reason not to use the 16F84 if you have them on hand.

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