Fred: File Replacement, Entry, and Deletion

This handbook provides technical documentation for the FRED (File Replacement, Entry, and Deletion) subroutine package designed for the PDP-12 computer using LAP6-DIAL.

Key features include: - Overview: A collection of routines that handle index manipulation, including file searching, creation, replacement, and deletion. - Functionality: Detailed descriptions of core routines such as GETFLD, READ, WRITE, LOOKUP, ENTER, REPLACE, and DELETE. - Technical Environment: Requirements for memory allocation, loading procedures, and parameter list structures. - Flow Charts: Visual representations of the logic for ENTER, REPLACE, DELETE, and the LOOKUP scanning process. - Implementation: Full source assembly code listing providing insight into the underlying LINC mode programming and beta register definitions.