Nope, it's a typo.
There isn't an 18F877A.
On the Microchip page below, drop down the "Select a Device" box.
If it's not in the list, it probably doesn't exist ... or is obsolete.
Microchip Datasheet Finder
http://www.microchip.com/stellent/id...GE&nodeId=2046
Save it to your Favorites.
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