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USB4VC is an active protocol converter that let you use USB keyboard, mouse, and gamepads on a wide range of retro computers.

With a modular design, different platforms are supported by swapping out Protocol Cards:

Two Protocol Cards are currently available:

IBM PC Compatible

• PS/2 Keyboard (Scancode set 1, 2 and 3)
• PS/2 Mouse
• AT Keyboard
• XT Keyboard
• Microsoft Serial Mouse
• Mouse Systems Serial Mouse
• 15-pin Gameport Gamepad
• Mapping USB Gamepad to PC Mouse/Keyboard

From the very first IBM PC in 1981 until the end of PS/2 ports in early 2000s, this Protocol Card covers it all!

Apple Desktop Bus (ADB)

• ADB Keyboard
• ADB Mouse
• Mapping USB Gamepad to ADB Mouse/Keyboard

From Apple IIGS in 1986 to PowerMac G3 in 1999, and everything in-between!

More to Come!

Of course, more Protocol Cards are planned, and you can make your own too!

Videos

Click me to see USB4VC in action!

Click me for LGR Review!

Click me for Michael MJD Review!

Highlights

• USB Keyboard/Mouse/Gamepads on Vintage Computers!

• Modular & Swappable Protocol Cards

• Wireless / Bluetooth

• Ultra Low Latency (0.5ms)

• OLED Display

• USB-C Powered

• Fully Open-source

• Make-your-own Protocol Card Instruction Provided

Why / Project Goals

Before the homogeneity of USB peripherals today, computer input devices were a wild west of proprietary peripherals, as different platforms used their own connectors and protocols for keyboards, mice, and gamepads.

With the popularity of retro computing today, it poses several issues:

• Many of those peripherals are simply hard to find, commanding a premium on online marketplaces. They are only getting rarer, and without them, the computer itself is useless.

• After decades of service, many can be degraded and unreliable (e.g. foam & foil keyboards), requiring extensive restoration.

• Let's be honest here, most early peripherals simply does not feel that great. Mushy membrane keyboards, sticky ball mice, plasticky gamepads, etc. And of course, the good ones gets very expensive.

• On the other hand, high quality USB peripherals can be had for a very reasonable price today with vastly superior tactility, precision, and ergonomics.

• Thus, this project aims to make retro computers simply more enjoyable to use.

• I also hope it can lower the barrier of entry for certain machines, put more computers back in action, help preserving existing rare peripherals, and generally help more people get into this hobby!

But of course, one can argue that using period-correct peripherals is simply part of the hobby, but just like HDMI upscalers or floppy emus, it's nice to have the option to enhance the experience.

How it Works

USB4VC consists of two halves: Baseboard and swappable Protocol Cards.

Baseboard contains user buttons, OLED screen, and a Raspberry Pi. It processes USB input events, which are sent to Protocol Card.

Each Protocol Card has a dedicated microcontroller and the appropriate circuitry and connectors for a specific platform.

By splitting duties, RPi can focus on input parsing, and Protocol Card handles timing critical signal generation, resulting in a flexible architecture and reliable performance.

USB peripherals can be connected via cables, wireless dongles, or Bluetooth.

Q&A

Which Raspberry Pi can I use?

Any RPi with a 40-pin header should work, although Model B/B+ is preferred. See this table for details, sort by GPIO column.

USB4VC has been officially tested on Raspberry Pi 2/3/4 Model B.

Raspberry Pi Zeros should work too, but would need a USB hub.

No need to get the latest and greatest. An older RPi is plenty fast enough!

What about latency?

0.5ms to 1ms depending on the Raspberry Pi generation.

1ms is one thousandth of a second. More info here.

Can you develop a Protocol Card for ___ ?

I'd love to! But I would need a working machine with working peripherals.

So if you're in UK and is happy to lend me one for a while, let me know!

Can I make my own Protocol Cards?

Of course! See this document.

What does USB4VC stand for?

USB for Vintage Computers. Although come to think of it, it's perfect for vintage consoles too! 🤔

Useful Links

• Project Main Page

• Getting Started Guide

• Technical Details / Make Your Own Protocol Cards