Service Manuals, User Guides, Schematic Diagrams or docs for : xerox mesa 3.0_1977 listing AltoDefs.mesa_Oct77

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altodEFS.mESA                 24-0CT-77 21;15;31                            Page 1


-- AltoDefs.Mesa   Edited by Satterthwaite on February 9, 1977   1:43 PM
AltoDefs: DEFINITIONS
  BEGIN
 wordlength: INTEGER = 16;          Alto word length (bits)
 maxword: CARDINAL = 1777778;       N.B. negative as 16 bit number
 maxinteger: INTEGER   077777B;          -- maximum positive number
 charlength: INTEGER    8;        Alto character size (bits)
 maxcharcode: INTEGER = 3778;
 BYTE: TYPE = [0 .. maxcharcode];
 BytesPerWord, CharsPerWord: INTEGER = wordlength/charlength;
 LogBytesPerWord, LogCharsPerWord: INTEGER = 1;
  Page~ize: INTEGER" 256;       -- Alto page size (words)
  LogPageSize: INTEGER = 8;
  BytesPerPage, CharsPerPage: INTEGER = PageSize*CharsPerWord;
  LogBytesPerPage, LogCharsPerPage: INTEGER" LogPageSize+LogCharsPerWord;
 VMLimit: CARDINAL = 177777B;       maximum Alto VM address
 Address: TYPE" [0 .. VMLimit];
 MaxVMPage: INTEGER" 255:        maximum Alto VM page number
 MaxFilePage: CARDINAL" 077777B;
  PageNumber: TYPE" [0 .. MaxFilePage];
  PageCount: TYPE" [0 .. MaxVMPage+l];
  END.

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