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  1. Return-Path: <icon-group-sender>
  2. Received: from kingfisher.CS.Arizona.EDU (kingfisher.CS.Arizona.EDU [192.12.69.239])
  3.     by baskerville.CS.Arizona.EDU (8.8.7/8.8.7) with SMTP id IAA28461
  4.     for <icon-group-addresses@baskerville.CS.Arizona.EDU>; Tue, 17 Mar 1998 08:03:57 -0700 (MST)
  5. Received: by kingfisher.CS.Arizona.EDU (5.65v4.0/1.1.8.2/08Nov94-0446PM)
  6.     id AA26187; Tue, 17 Mar 1998 08:03:57 -0700
  7. Date: Mon, 16 Mar 1998 16:46:26 -0700
  8. From: Ralph Griswold <ralph>
  9. Message-Id: <9803162346.AA17067@jupiter.CS.Arizona.EDU>
  10. To: evans@gte.net, icon-group@optima.CS.Arizona.EDU
  11. Subject: Escape characters
  12. Cc: icon-group
  13. Errors-To: icon-group-errors@optima.CS.Arizona.EDU
  14. Status: RO
  15. Content-Length: 664
  16.  
  17. It's not so much 7-bit systems, but on many platforms there are
  18. no displayable graphics for much of the upper-half of the 8-bit
  19. ASCII character sets, and on some systems, attempting to display them
  20. can cause peculiar results, as can attempting to print them.  The characters
  21. themselves, as far as I know cause no problem in files.
  22.  
  23. The rule is that if a character is not deemed "printable" over
  24. a broad range of platforms, is is encoded with escapes by image()
  25.  
  26.  
  27. Ralph E. Griswold            ralph@cs.arizona.edu
  28. Regents' Professor
  29. Department of Computer Science
  30. The University of Arizona        520-621-6609 (voice)
  31. P.O. Box 210077
  32. Tucson, AZ 85721-0077            520-621-4246   (fax)
  33.