ISR11 S0CCER - A Concordance Program chapter Guy E. Hochgesang Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. 111-13 b) Explanation The IN[OCRerr] tape is A7 (logical number 12) and a tape containing the text to be processed must be mounted on unit A7. The text must be the first file on this tape and must end with a t1[OCRerr]T[OCRerr]P'1 card or an end-of-file. Since a tape sort of order three is specified, tapes on units A[OCRerr], A5, A6, B2, B3, sd El arc used as scratch tapes. The ten ALPH control cards iniply that numbers are included in the concordance. None of the occurrences of the types "[OCRerr]F'1 or 1tTHE11 will be listed in the concordance due to the RESTRICT control card. E. .[OCRerr]ubroutincs used by S[OCRerr]CCER A. IN[OCRerr]T IN[OCRerr]T is a double-buffered input-output routine which uses the data enannel traps to allow simultaneous data channel transmission and central processing unit operation. This allows S[OCRerr]CCER to overlap input-output and CTU operations to such an extent that it becomes tape-limited in most of its processing; i.e., it can process text as fast as it can read and write the necessary tapes. The FAP calling sequence to write a BCD record with I[OCRerr]T is: TSX $[OCRerr]DEC,[OCRerr] write BCD entry point; TSX TAF[OCRerr],O location of word containing [OCRerr]RTRAN tape number; TSX FIRST,O address of lowest word in buffer; TSX IiAI[OCRerr]',O word count of one half of buffer; TSX BL[OCRerr]CK,O word count of block to be transmitted; TSX REC[OCRerr]RD,O record size. Each call to [OCRerr]DEC starts the transmission of a buffer-half of words to the specified tape unit, starting with the lower half of the buffer. T[OCRerr]en [OCRerr]DEC returns, the results of the previous transmission are returned in the AC as follows: