Go back to the future with this DIY arithmetic unit
By Ben Everard. Posted
This article was originally published as part of HackSpace magazine, which has since been incorporated into Raspberry Pi Official Magazine.
Arith-Matic S1-AU Mk1
How does a computer work? That’s the question that Arith-Matic are aiming to answer. They’re launching a beautifully crafted 4-bit arithmetic unit built out of 7400 series logic chips. Four input switches allow you to load data into two registers, and display the result. This result can then be loaded back into one of the registers, allowing rudimentary multiplication. All the processing takes place in 7400 series chips (flip-flops, multiplexers, adders, logic gates, etc.) – there are no programmable parts on the board. Don’t be fooled by the USB cable – there’s no data uploading, it just provides power.
Advertisement
Head to head: Raspberry Pi + Raspberry Pi Zero + Raspberry Pi Pico.
The board comes in kit form, so you will need to know how to solder it together, but that’s the only knowledge you need to use it. There’s a comprehensive manual available digitally which goes through how the board works – including descriptions of the various sub-elements that make the board work (de-bouncing circuits, current-limiting resistors, etc.), and how the processes demonstrated in the board fit into the larger picture of computing.
It could be a good tool to help children understand what goes on inside computers, but it is more than this. It’s the combination of form and function which particularly impresses us. The well-spaced through-hole components with large (5 mm) LEDs hark back to the older days of homebrew computing. They look great on a slate-grey PCB which is designed for its aesthetics as well as working really well. It’s the sort of circuit board that’s fun to assemble and play with, but also looks great adorning your workshop.
From £40 arith-matic.com Delivery: 2018
Ben is the Editor of HackSpace magazine. When not wrangling words, he enjoys cycling, gardening, and attempting to identify wild mushrooms.
Subscribe to Raspberry Pi Official Magazine
Save up to 37% off the cover price and get a FREE Raspberry Pi Pico 2 W with a subscription to Raspberry Pi Official Magazine.
More articles
All right all right!! Artificial Intelligence, Hollywood style
When we get AI right, odds on it’ll be thanks to small firms, motivated individuals, and Raspberry Pi
Read more →
Pironman 5 Mini review
Compact and bijou, this Raspberry Pi 5 case looks cool
Read more →
E-ink shipping monitor
The display comprises a Raspberry Pi Zero 2 W, a Pimoroni Inky Impression 7.3-inch display, and a Wegmatt dAISy Mini AIS receiver. AIS stands for ‘Automatic Identification System’, and it’s this device that picks up the signals coming from the ships themselves, which goes to the display via the Raspberry Pi Zero 2 W. There’s probably a […]
Read more →
Sign up to the newsletter
Get every issue delivered directly to your inbox and keep up to date with the latest news, offers, events, and more.