Keyboard Builders' Digest / Projects
TrackPoint78 keyboard
ChnMasterOG released the TrackPoint78, a three-mode wireless keyboard with built-in trackpoint.
Published September 21, 2025
The 75% TP78 or TrackPoint78 is a three-mode wireless mechanical keyboard project by ChnMasterOG aka seriscyberalchemist. The keyboard features a trackpoint and touchbar, and can be extended with modules via magnetic connectors.
[The TP78] was designed as an enthusiast keyboard to meet four fundamental needs: trackpoint, portability, wireless, customizable shortcut keys – ChnMasterOG.
By the way, this is already the third version of the series: the TP78v1 was driven by a CH582M controller unit, the TP78v2 uses Hi2821 as the MCU, and V3 sports a BS21E chip – supporting 8K polling rate wired.
The trackpoint's placement has been updated too: V1 used an IBM-style pointing stick located between the G/H/B keycaps, combined with low-pro switches for the mouse keys.
Then one day, I caught myself staring at the spacebar: I never actually press the middle part, do I? So I wrote a script to track thumb positions while typing. Sure enough, the middle section was almost never touched. What if… I split the spacebar and put the TrackPoint right in the middle? – ChnMasterOG.
So V2 moved the trackpoint in between the split space keys, aided by a touch sensitive strip. Finally, with the most recent version (V3), the author has ditched 3D printing and opted for a CNC machined aluminum case.
Features
- 75% layout, 78 keys
- MX switches, hotswap
- Hi2821 MCU
- YDX-C09 trackpoint
- OLED
- USB hub
- per-key RGB
- magnetic connectors for extension
- VIA
Resources
- TP78 on Github
- TP78 on OSHWHub
- Demo video on bilibili.
Published on Sun 21st Sep 2025. Featured in KBD #199 (source).
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