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+Network Working Group                                           R. Reddy
+Request for Comments: 320                                            CMU
+NIC: 9350                                                  27 March 1972
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+                  Workshop on Hard Copy Line Graphics
+
+   At CMU we have recently interfaced a Xerox Graphic Printer (ex-LDX)
+   to the PDP-10 using a PDP-11 as in intelligent controller for the
+   printer.  Specially designed interface and data structures permit the
+   PDP-11 to generate each scan line as needed without having to resort
+   to the brute force generation of the bit image for the whole page.
+
+   The attached pages were produced using this system with the help of a
+   document generation program and a character set design program.  This
+   is something personal.
+
+   In response to several requests, we are conducting a one day workshop
+   on the XCRIBL system.  The workshop will be held in 3124 Science Hall
+   at Carnegie-Mellon University on April 12.  An agenda for the
+   workshop is attached.  If you are interested in coming or sending
+   someone to this workshop, please contact Dr. D. R. Reddy (412-621-
+   6200 ext. 149), Mr. Mack Hicks (412-687-5846) or Miss M. Kostkas
+   (412-626-2600 ext. 141), for further information or local
+   arrangements.  Local reservations may be made at the Webster Hall
+   Hotel (412-621-7700) or the Civic Center Motor Hotel (412-683-6700)
+   which are within walking distance of Carnegie-Mellon University.
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+Reddy                                                           [Page 1]
+
+RFC 320           Workshop on Hard Copy Line Graphics         March 1972
+
+
+                        CARNEGIE-MELLON UNIVERSITY
+
+                   WORKSHOP ON HARD COPY LINE GRAPHICS
+
+                                 April 12
+
+                                  Morning
+                 Document Generating Languages and Systems
+
+   9:00-9:30    Raj Reddy          Overview of the XCRIBL system
+   9:30-10:20   Joe Newcomer       Languages for Document Generation
+   10:20-10:30  Coffee Break
+   10:30-12:00  Examples of Document Generation
+                              Letter Producing Systems
+                              Technical Report Production
+                              A Graphics and Gray Scale Image System
+
+                                 Afternoon
+                              Systems Support
+
+   12:00-1:45  Lunch               Character Sets (Generation and
+   1:45-2:45   Lee Erman           Modification)
+   2:45-3:00   Coffee Break
+   3:00-4:00   George Robertson    The PDP-11 Support System
+   4:00-5:00   Bill Broadly and    The PDP-11 XGP Interface (Hardware)
+               Jack Wright
+
+                                  Evening
+                         Session for the "Hackers"
+
+   7:30-10:30  Discussion session of as yet unsolved issues and
+               possible hardware-software solutions.
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+Reddy                                                           [Page 2]
+
+RFC 320           Workshop on Hard Copy Line Graphics         March 1972
+
+
+                              XCRIBL SYSTEM
+                        COMPUTER SCIENCE DEPARTMENT
+                        CARNEGIE-MELLON UNIVERSITY
+
+   What you are now reading is a computer printout produced by the
+   XCRIBL system.  Computers printers do not have typefaces like this
+   one nor can they change typefaces.  Conventional computer printers
+   cannot print character sets where the center to center distances are
+   not all the same.  The machine that printed this document is a
+   facsimile copying machine built by Xerox a number of years ago.  The
+   computer science department of Carnegie-Mellon University has
+   designed and constructed the interface to connect it to a
+   minicomputer (PDP-11) which in turn is linked to a large computer,
+   the PDP-10.  The equipment has been working since January.
+
+   The Xerox Graphic Printer (XGP) works in a similar fashion to the
+   Xerox office copiers.  Instead of reflecting light off a printed page
+   as in a copier the XGP uses a cathode ray tube similar to old
+   television tubes as a source of light.  The image is drawn as a
+   series of dots on the CRT with a resolution of 12 dots per inch.  The
+   line of dots is reflected  onto a selenium drum which
+   electrostatically attracts a fine black powder to the exposed
+   selenium areas.  The powder is transfered to a moving sheet of paper.
+   Finally a fuser melts the powder onto the paper.
+
+   To be able to print any character the pattern of dots which will be
+   printed as that character must be entered into the computer along
+   with an indicator of what the pattern represents.  To facilitate this
+   a program has been written to design character sets.  This program
+   draws a grid on a display terminal.  Each box in the grid represents
+   one dot in the final Xerox output.  The dots may be set or unset and
+   the character redrawn on the display as frequently as one might
+   desire.  Because of the ease with which this may be done it becomes
+   an enjoyable task to design a character set and then be able to
+   change any part of any character.
+
+   The XGP is also capable of drawing lines and gray scale images.  The
+   AI group is using the XGP to print pictures of faces and speech
+   spectrograms.  The range of possible uses is boundless.
+
+
+          [This RFC was put into machine readable form for entry]
+      [into the online RFC archives by Helene Morin, Via Genie 10/99]
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+Reddy                                                           [Page 3]
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