Accession Number : AD0744118

Title :   XCRIBL: A Hardcopy Scan Line Graphics System for Document Generation,

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE

Personal Author(s) : Reddy,R. ; Broadley,B. ; Erman,L. ; Newcomer,J. ; Robertson,G.

Report Date : 28 MAR 1972

Pagination or Media Count : 69

Abstract : XCRIBL is a system developed at CMU for generating hard copy computer output of arbitrary type fonts, graphics, and grey-scale images using a Xerox Graphic Printer (XGP). XCRIBL can be used to generate documents approaching the quality of printed text with the use of a document generation language (XOFF or PUB) and a character set design program (BILOS). Textual and graphic information to be printed is shipped in its raw form from the host computer (PDP-10) to a mini-computer (PDP-11) which acts as an intelligent channel controlling the XGP. Careful design of the data structures and the hardware interface permit the mini-computer to generate each scan line as needed without having to resort to a brute force solution of generating a bit-image for the whole page (3.5 million bits) for off-line printing. Variable width characters and the ability to mix text and graphics distinguish the present solution from the known simpler schemes for scan line generation. (Author)

Descriptors :   (*DATA PROCESSING, GRAPHICS), (*COMPUTER PROGRAMMING, INSTRUCTION MANUALS), INPUT OUTPUT DEVICES, OPTICAL IMAGES, INTERFACES, CONTROL SEQUENCES, SYSTEMS ENGINEERING

Subject Categories : Computer Programming and Software
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE