Module Requirements for PDP-1 and Options

This document, dated October 3, 1961, is a permanent memorandum (M-1116) from Ed Harwood at Digital Equipment Corporation. It outlines the specific quantities of System Modules necessary for configuring the PDP-1 Central Processor and its supported options, including memory modules, peripheral controls (reader, punch, typewriter), arithmetic units (Multiply & Divide Type 10), and various sequence break and tape control systems.