Floating Point Unit

This document describes the MAINDEC-11-DQFPB-B diagnostic program, designed to test the instruction functionality of the PDP-11/6x Floating Point Unit (FPU). It covers instructions not included in basic tests, including multiple operand arithmetic, comparisons, and integer-to-float conversions. It supports testing both 'Hot' (FP11-E) and 'Warm' (PDP-11/6x microcode) floating-point units. The manual includes requirements, loading/starting procedures, operating switch settings, error message formats, recovery information, and detailed descriptions of the diagnostic routines used.