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Controller Works

city42 Prototypes

city42 Prototypes

Regular price 8,352.16TL
Regular price 12,578.55TL Sale price 8,352.16TL
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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