Printronix P5000 Series Reference Manual page 31

NOTE: An error condition exists any time a GR character follows an SS2 or
SS3 sequence. The software should never send a GR character after
an SS2 or SS3 character.
If either (A0 hex) or (FF hex) are received after SS2 or SS3, the following
occurs:
•
The DEC LG Emulation prints the error character (a reverse question
mark) and resets the single shift flag when a (94) character resides in the
set being accessed (either G2 or G3).
•
If a (96) character resides in the set being accessed (either G2 or G3), the
printer images the corresponding character, (A0 hex) or (FF hex), of that
set, then resets the single shift flag.
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