COMTRAN Reconstruction

J28-6169 · January 1962

90.03.01

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[90.03.01]

A. General Description of Binary Load Decks

1. Binary Card Format

The 22 word columnar binary card form is used.

Word 1    S, 1      11   (relative deck indicator)
          2         checksum control bit
                          0 = verify checksum
                          1 = do not verify checksum
          3         1    (Commercial Translator)
          4         0
          5-7       deck type
          8-12      01010
          13-17     word count (beginning with word 3)
          18-20     000
          21-35     card sequence number

Word 2    logical sum of word 1 and all data words on the card.

Words 3-24   data
2. Binary Decks

Each section of the binary deck (e.g., Control Break Table, Text) is sequenced independently, beginning with sequence number 0. Any section except the text can be missing under certain conditions. Within any section, the cards must be in proper sequence, and the sections themselves, if present, must be in order by deck type.

The deck type codes, which appear in word 1, bits 5-7, are as follows:

001   debugging dictionary
010   control break table
011   file check table
100   text

The debugging dictionary is not implemented in the initial release.

The binary portion of the program deck is limited by the *CTEXT and *CTEND cards.

B. FILE CHECK Table

1. Introduction

The File Check Table, if present, is used to validate the contents of