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

This is a fully assembled and tested TeensyROM board, including a pre-loaded Teensy 4.1. It has a bunch of built-in utilities and games, ready to plug and play

TeensyROM is a fully open source project that I'm offering for only slightly above the cost of materials alone (see costed bill of materials in documentation)

See full documentation and design details here: https://github.com/SensoriumEmbedded/TeensyROM

Repository also contains a 3D printed case design that you can download and print at home

Questions, feature discussions, and updates discussed on the TeensyROM Discord Server: https://discord.gg/2EYYscWmRt

PCB has ENIG (Electroless Nickel Immersion Gold) finish

C64, MIDI keyboard/cables, and USB/SD drives not included

TeensyROM Features Compatable with C64 and C128 machines/variants, NTSC and PAL supported

Super fast Loading (.PRG/P00) or ROM emulation (.CRT) directly from

USB thumb Drive

SD card

Teensy Internal Flash Memory

Transfer directly from PC

C# Windows app included

MIDI in/out via USB Host connection

Play your SID with a USB MIDI keyboard

Use with popular software such as Cynthcart, Station64, etc

Supports all regular MIDI messages in and out

Can use your C64 to play a MIDI sound capable device

Sequential, Datel/Siel, Passport/Sentech, and Namesoft MIDI cartridges emulated

Use a USB Hub for multiple instruments+thumb drive access

MIDI in via USB Device connection

Stream .SID or .MIDI files/data from a modern computer directly to your Commodore machine SID chip

Play MIDI files out of your PC into C64 apps such as Cynthcart or the MIDI2SID app

Play .SID files out of your PC using the ASID MIDI protocol to hear any SID file on original hardware

Internet communication via Ethernet connection

Connect to your favorite C64/128 Telnet BBS

Use with released software such as CCGMS, StrikeTerm2014, DesTerm128, etc

Swiftlink cartridge + 38.4k modem emulation

Send AT commands from terminal software to configure the Ethernet connection

Sets C64 system time from internet

Firmware updates directly from SD card or USB thumb drive

Just drop the .hex file on an SD card or USB drive, no need for extra software to update

Key parameters stored in internal EEPROM

Startup, Ethernet, timezone, etc retained after power down

See full documentation and design details here: https://github.com/SensoriumEmbedded/TeensyROM