Old Calculator Web Museum Historical Documents Archive
Overview of Monroe Monrobot III Programmable Electronic (Vacuum Tube) Calculator
Overview of the Monroe Monrobot III Programmable Electronic Calculator
This document is an overview of Monroe's Monrobot III "desk-sized" programmable electronic calculator. The machine is a decimal based, 20-digit calculator with fixed decimal at 10 digits behind the decimal point. It has a magnetic drum that holds storage registers and program steps. The drum holds 100 memory registers, and 200 program steps, allowing for fairly complex problems to be programmed on the machine. Output is printed on a typewriter, and input can come from a keyboard or punched paper tape. The logic of the calculator is implemented using 700 vacuum tubes and 200 diodes. The machine can be operated as an electronic calculator in manual mode, allowing calculations to be made on data before it is entered into a program.
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