Single Precision Decimal-to-Binary Conversion and Input

This document describes a subroutine for the PDP-8 computer that accepts up to four decimal digits from an ASR 33 teletype keyboard and converts them into a 2's complement binary representation. The routine supports both signed (via '+' or '-' characters) and unsigned input. It handles input errors such as non-numeric characters and provides re-entry capability via a back-arrow key. The document includes technical requirements, loading and calling procedures, operational constraints, a detailed functional discussion, a program listing in assembly language, and a logic flow chart.