2 layers80 × 58 mm Thomson MEMO7, the printed circuit board in 3D

Thomson MEMO7

Thomson TO7 replacement parts and expansions : MEMO7, RAM, SDDrive, Musique&Jeu

Size: 80 × 58 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 16
Nets: 41
Pads: 127
Tracks, vias: 189, 52
Pours: 232
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 14 Jul 2026
Updated: 27 Aug 2026

Overview

Thomson MEMO7 is an open-source printed circuit board by f1ac0, from the f1ac0/Thomson repository on GitHub. It is a 2-layer board of 80 × 58 mm with 16 parts on 41 nets, routed with 189 tracks and 52 vias.

It is built around the 74LS02PC and 74LS173SC. Its parts include 6 resistors, 5 capacitors, 3 ICs, 1 connector and 1 switch.

Main components

README

README.md

Thomson

Kids in the 80's in France discovered computers at school with the TO and MO series from Thomson.

Interesting expansions exist to enjoy these systems, see below.

In this repository I share the boards I modified for my own needs, for example to use the parts I have in stock, or because I like my own routing.

Disclaimer and Acknowledgements

This is a hobbyist project, it comes with no warranty and no support. Also remember that the Commodore machines are about 40 years old and may fail because of such hardware expansions.

I publish my work under the CC-BY-NC-SA license, unless stated otherwise. Thanks to everyone who share their knowledge and creations.

Sources and interesting projects

Cartridges

https://dcmoto.pages-perso.free.fr/bricolage/memo7/index.html

RAM

https://www.forum.system-cfg.com/viewtopic.php?f=18&t=10807

Expansions

Parts

Qty	Value	Footprint	References
5	1.5K	Resistor_SMD:R_0805_2012Metric	R1, R2, R3, R4, R5
3	100nF	Capacitor_SMD:C_0805_2012Metric	C2, C3, C4
1	10uF	Capacitor_SMD:C_0805_2012Metric	C5
1	5uF	Capacitor_SMD:C_0805_2012Metric	C1
1	6.8K	Resistor_SMD:R_0805_2012Metric	R6
1	74LS02	Package_DIP:DIP-14_W7.62mm	U3
1	74LS173	Package_DIP:DIP-16_W7.62mm	U2
1	SST39SF040	Flaco:PLCC-32_SMD-Socket	U1
1	SW_DIP_x07	Button_Switch_THT:SW_DIP_SPSTx07_Slide_9.78x19.96mm_W7.62mm_P2.54mm	SW1
1	TO7_MEMO7_port	Flaco:TO7_MEMO7	J1

Questions

How big is the Thomson MEMO7 PCB?

It measures 80 × 58 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Thomson MEMO7 use?

16 parts, built around the 74LS02PC and 74LS173SC. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Thomson MEMO7 KiCad files?

From the f1ac0/Thomson repository on GitHub, at the commit this page was made from: the board is Thomson-MEMO7/KiCad/Thomson-MEMO7.kicad_pcb and its schematic TO7-RAM/KiCad/TO7-RAM.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Thomson MEMO7 design in my own project?

Its repository states no licence, so its author keeps all rights: ask f1ac0 before reusing the design.

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/f1ac0-thomson-thomson-memo7" title="Thomson MEMO7 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/f1ac0-thomson-thomson-memo7.jpg" alt="Thomson MEMO7" width="1200" height="900">

A picture that opens the board, for a README

[![Thomson MEMO7](https://pcbkit.io/embed/boards/f1ac0-thomson-thomson-memo7.jpg?size=s)](https://pcbkit.io/boards/f1ac0-thomson-thomson-memo7)

Source

Repository: f1ac0/Thomson
Board file: Thomson-MEMO7/KiCad/Thomson-MEMO7.kicad_pcb
Commit: 9fc5fa1
Licence: Not stated

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