Commodore 128 Hardware

Ultra36

A menu-driven multi-ROM system for the Commodore 128. Keep your essential function ROMs together, select them from one interface, and create a menu image labelled for your exact configuration.

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One system, your ROM collection

Ultra36 is designed for the C128 internal function-ROM socket and supports either eight or sixteen 32KB banks. Its dedicated menu ROM provides quick bank selection alongside useful C128 system information and controls.

Menu-driven selection

Select a labelled ROM bank directly on the Commodore 128 without rebuilding a generic menu by hand.

8 or 16 banks

Build a 256KB image for eight banks or a 512KB image for the full sixteen-bank configuration.

Built for your setup

The online builder compiles Bank 0 with your display names and assembles the final image locally.

Predictable bank layout

Bank 0
Custom Ultra36 menu, compiled with your ROM names.
Bank 1
Essential empty bank for a clean C128 state and external cartridge compatibility.
Banks 2–7/15
Your 16KB or 32KB ROM images. The builder safely pads 16KB files to a full bank.

Specifications

  • PlatformCommodore 128
  • Bank size32KB
  • Configurations8 or 16 banks
  • Final image256KB or 512KB
  • ROM input16KB / 32KB
For Ultra36 owners

Build and maintain your device

The User Zone contains the custom Multi-ROM builder and will also host Tiny84A controller firmware and update instructions. A valid Ultra36 serial number is required to access these owner tools.

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Links and resources

Useful software, ROM collections, diagnostics, and development resources for Ultra36 and the Commodore 128.