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Fastload/Emulation, MIDI, NFC Launch, Ethernet, REU, RTC, and more for Commodore 64/128:
Teensy
Retrocomputing
MIDI

Pre-order: TeensyROM+ Multi-Capable Cartridge for C64/128

Made by Travis' Sensorium

$59.00

No tax for United States [change]

This is a threshold pre-order. Learn more.

6 days left

Commited: 0 units

Maximum: 100 units available

Duration: 7 days

Lead time: 7 days

New design from our friends at 0ldSkull Retro
Be ready to roll with thousands of games, SIDs, and Demos

TeensyROM+ Multi-capable Cartridge for C64/128

Connect your Commodore to the 21st century

TeensyROM is a ROM emulator, super fast loader, MIDI Host+Device, NFC Host, and Internet interface cartridge for the Commodore 64 & 128, based on the Teensy 4.1

By purchasing from me (the designer) you are directly supporting this project, thank you!

This is the latest TeensyROM PCB revision (v0.4) which adds even more features and future possibilities (see below)

This is a fully assembled and tested TeensyROM+, including a pre-programmed Teensy 4.1.

Includes >100 files built-in: SIDs, games, utilities, tests, pictures, and more, ready to plug and play! Add an SD card for thousands more. :)

New TeensyROM+ low-profile purple case design provided exclusively by 0ldSkull Retro. Be sure to check out all their excellent offerings as well!

Features include: (100% of the features available in previous TR version)

  • ROM emulator: The perfect way to play CRT files, such as the highly recommended OneLoad64 collection.
  • Instant loader: Immediately load and run program (PRG) files
  • MIDI USB Host & Device, custom ASID Player: Use a MIDI keyboard, DAW, or ASID source to play your SID chip.
  • Ethernet interface: Connect to a Telnet BBS or use the integrated web browser to surf, search, and download.
  • Remote Control your C64 using
  • SID File Player with voice muting and speed control
  • Bitmap Picture viewer, Text/PETSCII viewer, Custom BASIC Commands, Autolaunch, and more
  • Lots of games, utilities, pics, and music built-in: no external media required to get started!
  • Multiple Hardware Interfaces: SD card, USB Drive, USB Device and host Ports, Ethernet Port
  • C64 Ultimate user? See this list of enhancements the TR brings to your C64U

TeensyROM+ revision (v0.4) adds the following capabilities:

  • Second Button: Triggers a freezer cart or other future features.
    • Super Snapshot v5 currently supported.
  • DMA Control: Take direct/fast control of your system. Lots of possibilities with this.
    • Initial implementation: 512K REU for C64
  • Battery backed Real Time Clock: Always display the correct time of day.
    • CR1225 Battery included for U.S. Shipments only, due to shipping restrictions*
  • External Reset Detect: Get back to the TR menu with any external reset button.

See the TeensyROM GitHub for complete documentation, FW revisions, etc. Join feature discussions, questions, and update announcements on the TeensyROM Discord Server Compatible with C64 and C128 machines/variants (ie C64U/U64), NTSC and PAL supported. PCB has ENIG (Electroless Nickel Immersion Gold) finish.

Feel free to contact me via this seller or direct e-mail if you have any questions.

Thank you!
-Travis/Sensorium

Links to code and documentation

Documentation (github.com)

Code (github.com)

Design Files (github.com)

Product HS Code: 847330

Shipping policy

I strive to process and ship all orders the same or next day from order. Tracking info will be provided promptly.

Please feel free to contact me if you have any questions about shipping or your order in general.

Why run a threshold pre-order campaign?

Thanks for your interest in the TeensyROM+!

More stock is on the way, and pre-orders are now open. This is your last chance to secure one at the current price—the price will increase by $5 once restocked.

Reserve yours here, and feel free to reach out with any questions.

Thanks again!

– Travis

The seller

Travis' Sensorium

Travis' Sensorium logo

Hillsboro, Oregon, United States
13 orders since Apr 16, 2026
Electronics and Embedded designs for your enjoyment.