> Symbol not previously defined (trisa)

etc etc etc

Sorry, my bad. As Jan-Erik says, case sensitivity will be the
fix. I generally use lower case (don't like the look of code that's
SHOUTING at me). You'll see a Case Sensitive box on the
MPASM screen, make sure it's unticked if you're going to use
any lower case. If you look in any .inc file you'll find it's all upper
case

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