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..._1
RESEARCH. INC.




        PREUMINARY
        REFERENCE
        MANUAL
        THE        CRAY-1            COMPUTER

                       PRELIMINARY


                 REFERENCE MANUAL




CoPYRIGHT (C) 1975 BY CRAY RESEARCH, INC.    THIS MANUAL, OR PARTS
THEREOF, MAY N0T BE REPRODUCED IN ANY FORM WITHOUT PERMISSION OF
CRAY KESEARCH, NC. I HIS ~UAL CONTAINS PRELIMINARY INFORf'1ATION
WHICH IS SUBJECT TO CORRECTION AND CHANGE WITHOUT FORMAL NOTICE TO
COpy HOLDERS.
New features, as well as changes, deletions, and additions to information in this manual are
indicated by bars in the margins or by a dot near the page number if the entire page is affected.
A bar by the page number indicates pagination rather than content has changed.


                                    REVISION RECORD
REVISION                                        DESCRIPTION

  4/75          Ori2inal PrintinQ'

   A            This revision corrects various typograppical and technical
  6/75          errors.
                                CONTENTS


Introduction                                 1

Summary of machine characteristics           1

Principal operating registers                1

          A registers                        1
          B    registers                     1
          S registers                        2
          T registers                        2
          V registers                        2
          VL register                        2
          VM register                        2
          P register                         2

Supporting registers                         5

          BA register                        5
          LA register                        5
          XA register                        5
          F register                         5
          M    register                      6

Input/Output                                 6

Comparison of scalar and vector processing   6

Functional units                             7

Instruction formats                          7

Special register values                      9

Instruction buffers.                         9

Data formats                                 9




Rev. A                            iii
CAL language structure           11

Statement format                . 11

          Location field         11
          Result field           11
          Operand field          11
          Comments field          11

Coding conventions               12

Comments statement                12

Lower case in comments            12

Symbols                           12

Special element,   *              13

"P." prefix                       13

"W." prefix                       13

Expressions                       13

CPU register designation          14

Pseudo-instructions               14

          ABS                     14
          BSS                     14
          BSSZ                    15
          CON                     15
          EJECT                   15
          END                     15
          ENTRY                   16
                                  16
          IDENT                   16
          LIST                    16
          ORG                     17

CPU instructions                  18




                           iv
Appendix A.   Summary of CPU instructions
                                            

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