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Controller Works

city42 Prototypes

city42 Prototypes

Regular price £194.92 GBP
Regular price £293.55 GBP Sale price £194.92 GBP
Sale Sold out

This listing is for the city42 prototype units. These units are tested and ready to ship. There is a separate listing for the production units of the city42.

The city42 is a 42 key low profile ergonomic unibody split keyboard inspired by the Corne (CRKBD) and designed for Kailh Choc switches. Key features include:

  • Fully pre-built with no assembly required.
  • CNC milled, anodized aluminum case including top and bottom plate. Switches mount directly in the integrated top plate for extra rigidity.
  • RP2040 processor with 16 MB flash memory
  • 40mm Cirque trackpad controller
  • Per-key LEDs
  • "Chocolate" spacing: switches are spaced 18mm (width) x 17mm (height) apart
  • USB-C port with over-current and ESD protection
  • Hot-swap sockets for Kailh "choc" PG1350 low profile switches. Switches come pre-installed and tested if ordered with a keyboard.
  • Pre-loaded with QMK Firmware and Via GUI support
  • Premium construction: RoHS components, lead-free solder paste on all PCBs.
Powered by QMK Firmware

    Required for Operation:

    • 42 Kailh "Chocolate" switches
    • 40 Kailh "Chocolate" 1u keycaps
    • 2 Kailh "Chocolate" 1.5u keycaps
    • 1 USB-C cable

    Product Comparison

    Feature city42 Low Profile Corne Chocolate
    Soldering Pre-built DIY
    Depends on micro-controller board, TRRS
    Processor RP2040 ATMega32U4
    Program Memory 16 MB 1 KB
    Clock 133 MHz 16 MHz
    Firmware QMK
    Keymap Via, Vial
    Via, Vial
    Spacing Chocolate MX
    Lighting Per-key Per-key and back-light optional
    Display N/A OLED module
    Pointing 40mm Cirque trackpad N/A
    Backplate CNC machined aluminum
    Switches Kailh Chocolate only
    Keycaps Chocolate spacing only MX spacing
    Circuit Protection ESD and over-current on USB-C N/A



    Aluminum case and FR4 main board.

    Shipping & Returns

    International shipping can be complex. Please ask on chat for custom shipping quotes for international orders. Key cap sets can be shipped in a small bag or in the original packaging for an additional charge.


    Care Instructions

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