Core rope memory - Wikipedia
Core rope memory is a form of read-only memory (ROM) for computers. It was used in the UNIVAC I (Universal Automatic Computer I) and the UNIVAC II, developed by the Eckert-Mauchly Computer Corporation in the 1950s, as it was a popular technology for …
Software as Hardware: Apollo’s Rope Memory - IEEE Spectrum
Sep 29, 2017 · In rope memory, bits of information are represented by threads of wire and tiny doughnut-shaped magnetic cores. A core with wire threaded through the center represents a 1; an empty core represents a 0. In this way, the pattern of wires can form a computer program—software crystallized as hardware, in other words.
Software woven into wire: Core rope and the Apollo Guidance …
An unusual feature that contributed to its small size was core rope memory, a technique of physically weaving software into high-density storage. In this blog post, I take a close look at core rope and the circuitry that made it work. 1. Detail of core rope memory wiring from an early (Block I) Apollo Guidance Computer. Photo from Raytheon.
Making Core Memory – An experiment in troubling computing …
Jun 13, 2002 · Sitting under task lamps in a Raytheon facility outside of Boston, they are making “core memory” for the Apollo Guidance Computer. They thread the wire through the ferrite cores and code one bit of information into each connection. It looks similar to weaving. www.makingcorememory.org.
Magnetic-core memory - Wikipedia
In computing, magnetic-core memory is a form of random-access memory. It predominated for roughly 20 years between 1955 and 1975, and is often just called core memory, or, informally, core. Core memory uses toroids (rings) of a hard magnetic material (usually a semi-hard ferrite). Each core stores one bit of information.
Core Rope Visualizer - apolloguidance.computer
There are two main components of addressing core rope memory: core selection and strand selection. Core Selection Magnetic Properties and Basic Wiring. The goal of core selection is to select a single core out of the 512 in a module. This is done in two phases: the "set" phase and the "reset" phase.
Apollo Flight Journal - The Apollo On-board Computers - NASA
Memory provides the storage for the computer and is divided into fixed memory and erasable memory. The fixed memory is high density core rope; tiny nickel-iron cores woven together with thousands of copper wires and encapsulated in plastic.
Saving Apollo By Decoding Core Rope - Hackaday
Nov 4, 2023 · And if you are thinking of core memory based on ferrite cores, get ready for a brain stretch, as core rope is quite a bit different, and is even more complicated to read.
Inside the Apollo Guidance Computer's core memory
Core memory was built from tiny ferrite rings called cores, storing one bit in each core. Cores were arranged in a grid or plane, as in the highly-magnified picture below. Each plane stored one bit of a word, so a 16-bit computer would use a stack of 16 core planes.
The Read-Only Memory (ROM) of the AGC is one of its de ning features, and is surpris-ingly well-known even outside of groups that focus on ancient computing. This is primarily due to the distinctiveness of the chosen imple-mentation: Core Rope Memory (CRM). In short, CRM involves the conditional wrapping of wire around magnetized ferrite