* Mark characters mapped to C0 as only generally safe place for 
* most MS codepages maps (where most of C1 is in use, and usage changes over time)
*
* Table ensures that uniVerse sees characters in the range 25, 26 and 28 - 31
* as the internal mark characters, rather than as external 
* characters in that range (i.e. C0 control characters 19, 1A, 1C - 1F).
* Also treat SQL NULL as a special kind of mark.
*
19 @SQL.NULL
1A @TM
* 1B NOT USED - ESC character!
1C @SM
1D @VM
1E @FM
1F @IM