If I run the following in immediate mode in GRAPHIC 0 mode, I see exactly what 
I expect to see based on the chart of page 358 of the Commodore 128 System 
Guide

CHAR ,0,0,CHR$(111)

(a right-angle corner character, as in the top-left of a box)

But if I am in GRAPHIC 1 mode and run the same line of code, I get a different 
character (a diagonal line). In fact it's CHR$(143) in GRAPHIC 1 mode that 
yields the same character.

How can I understand this difference?

Thanks!

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