Fylhlp - Ps/8 File Utility Program

FYLHLP is a utility program designed for PS/8 systems programmers to assist in maintaining file systems and debugging file-handling software. The program is divided into two main logical sections:

• HELP: This section interfaces with the system Command Decoder to list directory entries (including "empty" entries) for specified devices and to search, examine, or modify data blocks. It supports several options, such as 'E' to list empty files, 'N' for a condensed list, and 'S' to transfer control to the FYLLUK section.
• FYLLUK: This section provides an interactive environment for examining and modifying the contents of data blocks on a device. It operates using a 256-word buffer in memory, allowing users to open, edit, and search through block data using octal addressing.

The document includes detailed instructions on operation, command syntax (such as opening locations, setting search masks and limits, and closing blocks), and error handling procedures.