Series 1 - Memory Unit
Our pre-production S1-MU PCB

The S1-MU kit provides a tactile way to explore how computer memory works. It is a unique and rewarding soldering exercise for pragmatic computing enthusiasts, hobbyists and makers.

What is a memory unit?

A memory unit is a collection of digital circuitry used to store and access binary information. Although in modern computer architectures memory units can take many forms, they are typically used to store the instructions and data used to execute computer software.


The S1-MU Mk1 is a simple 8-bit memory unit designed with classic 7400 series ICs. It is the second in a series of DIY electronic kits designed to explore the hidden mechanims of computing.

The kit is a practical introduction to the basic binary mechanisms required to address, read from, and write data to memory.

Featuring a LY62256PL RAM IC for main memory, 74HC173 registers for temporary data storage and 74HC193 counters for sequential memory access, the assembled board will enable you to address, read from, write to, and sequentially access a memory store.

The S1-MU operates through tactile interactions using a carefully designed array of push button switches, and binary operations can be visually traced through a series of on-board ultra bright LEDs. The S1-AU is powered via a USB mini cable, so you don't need to rely on batteries.

Our kits will help you to delve directly into the guts of computing, enabling you to rediscover what computers are really made of! Explore binary notation, digital electronics, the joy of 7400 series ICs and the simple logical mechanisms found at the heart of every digital computer.

The S1-MU Mk1 will be launched in May 2019!
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What's included in the S1-MU Mk1 Kit?

The kit contains all the through-hole electronic components you’ll need to build a working 8-bit memory unit and includes:

  • S1-MU Mk1 Mainboard PCB (100mm x 162mm)
  • Backplate PCB (with screws and nuts for mounting)
  • Electronic Components Kit
  • USB Mini Cable (for power only)
  • Operator's Technical Manual (downloadable .pdf - English language only)

The kit is supplied with our comprehensive 'Operator's Technical Manual' (as a downloadable .pdf - English language only) which describes in detail what the memory unit is and how memory stores are used more generally in computers.

The manual also explains how to fully construct and operate the S1-MU and gives a primer on binary notation for those who may not be familiar with binary operations. Our mainboard PCB has been carefully crafted to complement the manual and aid construction.

The S1-MU Mk1 is recommended for ages 16+ and some soldering experience is required to construct the kit.

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