2 layers80 × 58 mm
Thomson MEMO7
f1ac0/Thomson
Thomson TO7 replacement parts and expansions : MEMO7, RAM, SDDrive, Musique&Jeu
16 parts
2 layers50.8 × 45.1 mm
Thomson SDDRIVE
f1ac0/ThomsonThomson TO7 replacement parts and expansions : MEMO7, RAM, SDDrive, Musique&Jeu
- Size
- 50.8 × 45.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 42
- Nets
- 86
- Pads
- 292
- Tracks, vias
- 836, 100
- Pours
- 482
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 14 Jul 2026
- Updated
- 27 Aug 2026
Overview
Thomson SDDRIVE is an open-source printed circuit board by f1ac0, from the f1ac0/Thomson repository on GitHub. It is a 2-layer board of 50.8 × 45.1 mm with 42 parts on 86 nets, routed with 836 tracks and 100 vias.
It is built around the SPX3819M5-L-3-3. Its parts include 19 resistors, 10 capacitors, 5 ICs, 5 connectors and 1 fuse. It belongs with the FPGA and CPLD boards of this library.
Main components
1README
README.mdThomson
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
RAM
Expansions
Parts
42| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 10k | Resistor_SMD:R_0805_2012Metric | R8, R9, R10, R11, R12, R14, R15, R16, R17, R18, R19 |
| 7 | 100n | Capacitor_SMD:C_0805_2012Metric | C3, C4, C5, C6, C7, C8, C9 |
| 7 | 20k | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R4, R5, R6, R7 |
| 2 | 10K | Resistor_SMD:R_Array_Convex_4x0603 | RN1, RN2 |
| 2 | 10u | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 1 | 10nF | Capacitor_SMD:C_0805_2012Metric | C10 |
| 1 | 1k | Resistor_SMD:R_0805_2012Metric | R13 |
| 1 | 4050 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U5 |
| 1 | Game 1 | Connector_Dsub:DSUB-9_Pins_Vertical_P2.77x2.84mm | J4 |
| 1 | Game 2 | Connector_Dsub:DSUB-9_Pins_Vertical_P2.77x2.84mm | J5 |
| 1 | JTAG | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J3 |
| 1 | Polyfuse_Small | Resistor_SMD:R_1210_3225Metric | F1 |
| 1 | SD_Card_Receptacle | Flaco:Conn_SDcard_largerpads | J6 |
| 1 | SPX3819M5-L-3-3 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | SST39SF040 | Flaco:PLCC-32_SMD-Socket | U1 |
| 1 | TO7.70_Expansion_port | Flaco:TO7.70_Expansion_port_Minibus_3x19_P2.54mm_W5.08mm_Vertical | J1 |
| 1 | XC6206PxxxMR | Flaco:SOT-23 | U4 |
| 1 | XC9572XL-xxVQx64 | Package_QFP:TQFP-64_10x10mm_P0.5mm | U6 |
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Questions
How big is the Thomson SDDRIVE PCB?
It measures 50.8 × 45.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Thomson SDDRIVE use?
42 parts, built around the SPX3819M5-L-3-3. 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 SDDRIVE KiCad files?
From the f1ac0/Thomson repository on GitHub, at the commit this page was made from: the board is Thomson-SDDRIVE-MusiqueJeux/KiCad/Thomson-SDDRIVE.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 SDDRIVE design in my own project?
Its repository states no licence, so its author keeps all rights: ask f1ac0 before reusing the design.