Reverse Assembler

This document describes the Reverse Assembler (DECUS No. 8-178), a utility program developed by Henry G. Dupont in November 1968 for the PDP-8 family of computers.

Its primary purpose is to convert binary paper tapes back into assembly language. It offers two main output modes, selectable via switch settings:

1. Mode 1: Produces a symbolic paper tape (with leader, "PAUSE" indication for checksum, and trailer) that is directly compatible with the PAL III Assembler.
2. Mode 2: Generates a printed listing of the assembly code, which is easier to read.

The program can decode mnemonics for PAL III, Floating Point, and most input-output device instructions. Users can also select input and output devices (High Speed Reader/Punch or ASR-33) and specify the presence of Floating Point instructions using front panel switches.

The Reverse Assembler is particularly useful when only a binary version of a program is available, allowing users to create a listing or a modifiable symbolic tape for updates or debugging. It requires a basic PDP-8, 8/S, or 8/I system and loads into memory locations 0-5400.