=> R1 = pointer to font identifier
R2 = character code of required qualifer
<= R1 = pointer to value following qualifer within string (if present, else preserved)
R2 = 0 if field not present, otherwise preserved
This SWI returns a pointer to the specifed field with the font string. Note that the F field is space terminated, all others are control-char terminated.
See PRM 3, page 493.
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