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IIe reverse character display problems



I recently got a IIe from my employer.  It's got 128k RAM, an 80 column 
card, a parallel printer card, and a DuoDrive hooked into slot 6.  I 
believe the system is "enhanced" but the processor chip says "6503" on 
it, not 6502 or 65c02.  Anyway, my problem is that text that should be 
in reverse characters is coming up as garbage.  This happens in both 40 
and 80 column modes.  Any ideas on why this is happening?

Jon