4 layers26.2 × 82 mm
4 layers120.4 × 66 mm
MSXCARD ext
leomanes/msxbook9- Size
- 120.4 × 66 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 9
- Nets
- 51
- Pads
- 108
- Tracks, vias
- 359, 46
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 24 Mar 2025
- Updated
- 18 Apr 2026
Overview
MSXCARD ext is an open-source printed circuit board by leomanes, from the leomanes/msxbook repository on GitHub. It is a 4-layer board of 120.4 × 66 mm with 9 parts on 51 nets, routed with 359 tracks and 46 vias.
Its parts include 3 fuses and 2 connectors.
README
README.mdMSXBook Side Slot
(External Slot 2 Adapter for MSXBook)
Can I sell this cart?
You are welcome to manufacture and sell this adapter to the MSX community, provided you adhere to the following condition:
- Do not modify the original files in any way or form.
Parts List
Main PCB
| Reference | Description | Recommended Rating / Type |
|---|---|---|
| F1 | Fuse (-12V line) | 125mA – 375mA |
| F2 | Fuse (+5V line) | 800mA – 1A |
| F3 | Fuse (+12V line) | 400mA – 500mA |
| J1 | Pin Header | 2x25 Right-angle |
| J2 | SCSI Connector | 50-pin Right-angle Male |
[!TIP] Fuses are optional but highly recommended. If you choose not to use them, replace them with a solid jumper wire.
External PCB
| Reference | Description | Recommended Rating / Type |
|---|---|---|
| C1, C2 | Capacitor (Optional) | 100µF – 220µF (25V) |
| C3 | Capacitor (Optional) | 220µF – 470µF (16V) |
| J1 | Edge Connector | 50-pin Right-angle |
| J2 | SCSI Connector | 50-pin Right-angle Female |
3D Printed Brackets & Hardware
The following dimensions are critical for proper fitment:
- Screws: M2.5 x 5mm
- Threaded Inserts: M2.5 x 2.5mm x 3.5mm
Sourcing Links
- General Parts: AliExpress Collection
- 2x25 50-Pin Header: AliExpress Link
- M2.5 Inserts: AliExpress Link
- SCSI Connectors: Option 1 | Option 2
Assembly Tips & Tricks
Soldering and Alignment
- Pin Header Height: The distance between the bottom of the Main PCB and the top of the angled pin header must be 7.3mm.
- Edge Connector Spacing: Ensure the distance between the PCB and the connector body is between 2mm and 3mm.
- Squaring the Connectors: Ensure the pin header and edge connectors are soldered at a precise 90° angle.
- Pro Tip: Solder only pins 1, 2, 49, and 50 first. Perform a fit test and verify the measurements above before soldering the remaining pins.
Final Enclosure Assembly
To install the PCB into the 3D-printed cartridge shell:
- Hold the board at a 45° angle.
- Insert the left side first (relative to the interior of the edge connector slot).
- Slide the board into place until it sits flush.
MSX FOREVER!
Parts
9| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | Fuse | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | F1, F2, F3 |
| 1 | 2x25 pin header | Documents:PinHeader_2x25_P2.54mm_Vertical_trimmed_2 | J1 |
| 1 | LOGO | Documents:cat | G*** |
| 1 | LOGO | Documents:cat_cut15 | G*** |
| 1 | SCSI 50 pin | ScSI:SCSI_50_F | J2 |
The 7 most common of 9 parts.
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Questions
How big is the MSXCARD ext PCB?
It measures 120.4 × 66 mm and has 4 copper layers, 1.6 mm thick.
What parts does the MSXCARD ext use?
9 parts. 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 MSXCARD ext KiCad files?
From the leomanes/msxbook repository on GitHub, at the commit this page was made from: the board is Kicad/Main board/MSXCARD_ext.kicad_pcb and its schematic Kicad/External board/MSX book_external_adapter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MSXCARD ext design in my own project?
Its repository states no licence, so its author keeps all rights: ask leomanes before reusing the design.