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Text File  |  1986-12-02  |  4KB  |  67 lines
  1. %!Copyright 1985,1986 Adobe Systems Inc.  All rights reserved.
  2. %Subject: improved LaserWriter serial I/O patch
  3.  
  4. %Several months ago, I circulated a downloadable program that corrects
  5. %several known problems in the LaserWriter's serial I/O handler.
  6. %Unfortunately, the patch did not completely fix one of the problems.
  7. %This message contains a revised patch that works better.
  8.  
  9. %The problems corrected by the patch are:
  10.  
  11. %  - occasional failure to send a needed XON after XOFF;
  12. %  - erroneously reading past end-of-file under some circumstances;
  13. %  - lost or garbled characters in serial output to the host.
  14.  
  15. %The patch applies only to the original LaserWriter (PostScript version
  16. %23.0) and not to any other PostScript printer; it affects serial
  17. %communication only (not AppleTalk). To install the patch, first edit
  18. %the program if necessary to change the system administrator password;
  19. %then send it as a separate job to the printer. Once installed, the
  20. %patch persists until the printer is next turned off.
  21.  
  22. %    Adobe Systems, Inc.
  23.  
  24. %---------- cut here ----------
  25. %! 
  26. 0000000000            % the exitserver password
  27.  
  28. version (23.0) ne
  29.    {(Patch not installed -- wrong printer type or version) = stop} if
  30. statusdict /Patch1Installed known
  31.    {(Patch already installed -- not installed again) = stop} if
  32. serverdict begin exitserver
  33. statusdict /Patch1Installed true put
  34. currentfile eexec
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