Program Logic Manual - All about the IBM 1130 Computing System

cters respectively.CSP D1 FORMAT:CSP Dl format consists of one digit per word, rightjustified,representation as described below:00000000 0000 digitbits 0 78 15Example: The six-digit field 001968 appears ona disk file beginning at record word n as follows:RecordWord: n-5 n-4 n-3 n-2 n-1 nContent: /0008 /0006 /0009 /0001 /0000 /0000The sign of the field is reflected in the low order(digit) word of the field, this word being the ones'complement of the digit if the field is negative.Example: The six-digit field -001968 appears ona disk file beginning at record word n as follows:RecordWord: n-5Content: /FFF7n-4 n-3 n-2 n-1/0006 /0009 /0001 /0000 /0000CSP D4 FORMAT:CSP D4 format consists in general of four decimaldigits per word, with each digit occupying four bitsof the word. However, since the low order digitcarries the sign of the field, it is handled separately,and is placed by itself in the last word of the D4field. Any 4-bit blocks not used in the field arefilled with /F. This format is best illustrated withexamples.Example 1: The five-digit field +12345 appears ona disk file beginning at record word n as follows:RecordWords n-1Content: /0005 /1234Example 2: The six-digit field +123456 appears ona disk file beginning at record word n as follows:RecordWord: n-2Content: /0006RecordWord: n-2Contents /FFF8n-1/5FFF /1234Example 3: The seven-digit field -1234567 appearson a disk file beginning at record word n as follows:n-1/56FF /1234349. 1 •