I’ve been slowly developing a small retro hardware project called VoltBus for the IBM PCjr and wanted to share the next piece I’ve been working on: VoltHub.

The idea behind VoltHub is pretty simple:

cleaner internal power routing

fewer loose splitters/adapters

integrated fan control

easier expansion for future mods

cleaner cable management inside cramped retro systems

Right now this is still very much a hobbyist/development project and I’m mainly focused on:

layout testing

connector placement

usability

airflow/fan control

visualizing how future modular upgrades could work together

The current concept includes:

LP4/Molex power distribution

Berg/floppy power

auxiliary/test outputs

fixed and adjustable fan headers using an LM317 circuit

expansion/power bus headers

compact modular stacking with VoltBus power passes through the link directly with no wires

I’m also experimenting with keeping the design somewhat cross-compatible between future systems/projects instead of making completely separate standards for every machine. The board can be powered through the voltbus or as a stand alone unit through LP4.

A few renders attached. These aren’t intended to be photoreal marketing renders, mostly just clean visualizations of the concepts and layouts while I continue testing and refining things.

I would genuinely love feedback!