2 layers389.2 × 181.8 mm
C64
schenkmi/electronic-retro-computing-projects
In revision 2, the PCB size has been reduced by more than 50% and TAPuino support has been ditched. It now features a Micro SD slot and a few other improvements.
260 parts
2 layers88.8 × 15 mm
In revision 2, the PCB size has been reduced by more than 50% and TAPuino support has been ditched. It now features a Micro SD slot and a few other improvements.
- Size
- 88.8 × 15 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 31
- Pads
- 166
- Tracks, vias
- 419, 78
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 29 Jul 2023
- Updated
- 9 Apr 2025
Overview
Simms is an open-source printed circuit board by schenkmi, from the schenkmi/electronic-retro-computing-projects repository on GitHub. It is a 2-layer board of 88.8 × 15 mm with 12 parts on 31 nets, routed with 419 tracks and 78 vias.
Its parts include 3 capacitors, 3 ICs and 1 connector.
README
SD2IECplug/README.mdSD2IEC Pluggable
- KiCAD project files for my take on a SD2IEC compatible board.
- The schematics are heavily based on the design by Shadowolf.
- The BOM export is included in the repository.
- There should probably be more documentation here, but while it is still missing you may find some additional information on my blog.
- This is all work in progress with absolutely no guarantees. USE AT YOUR OWN RISK!
Revision 2
In revision 2, the PCB size has been reduced by more than 50% and TAPuino support has been ditched. It now features a Micro SD slot and a few other improvements. Note: In this revision, the numbering of the LEDs has been accidentally reversed. This has been fixed later on the master branch.
Revision 1
The first revision required a much larger PCB but featured a full-size SD slot and experimental support for TAPuino functionality. The latter was never tested though and probably wouldn't work.
If you don't intend to use the TAPuino functionality (and there isn't any firmware support for this yet) you can omit R16-R21 and the optocoupler U3. Also, the board can be power either through the USB or the tape port connector so you don't necessarily need to fit both.
License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100n | Capacitor_SMD:C_1206_3216Metric | C1, C2, C3 |
| 2 | DRAM_HY514400_1Mx4bit | Silvestron Components:SOJ-26-20_8.89x17.4mm_P1.27mm | U1, U2 |
| 1 | 256k/1m | Jumper:SolderJumper-3_P2.0mm_Open_TrianglePad1.0x1.5mm | JP2 |
| 1 | Conn_01x30 | Silvestron Components:SIMM_30pin | J1 |
| 1 | DRAM_TMS4C1024_1Mx1bit | Silvestron Components:SOJ-26-20_8.89x17.4mm_P1.27mm | U3 |
| 1 | FPM/EDO hack | Jumper:SolderJumper-3_P2.0mm_Open_TrianglePad1.0x1.5mm | JP1 |
| 1 | LOGO | Silvestron Components:sbab-logo-20x6mm | G*** |
The 10 most common of 12 parts.
Questions
How big is the Simms PCB?
It measures 88.8 × 15 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Simms use?
12 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 Simms KiCad files?
From the schenkmi/electronic-retro-computing-projects repository on GitHub, at the commit this page was made from: the board is simms/simms.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Simms design in my own project?
Its repository states no licence, so its author keeps all rights: ask schenkmi before reusing the design.
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