C64 Ultimate Sender

Send a PRG or CRT you find online straight to your Commodore 64 Ultimate to run it.

Turn any PRG or CRT link into a one-click launch on your real Commodore 64. C64 Ultimate Sender talks to a Commodore 64 Ultimate (1541 Ultimate / Ultimate 64) on your local network using its built-in REST API. When you find a C64 program (.prg) or cartridge (.crt) online, send it to the machine and it resets and runs immediately — no downloading, copying to SD card, or menu navigation. How to use it: • Right-click any link to a .prg or .crt file and choose "Send to C64 Ultimate". • Or open the toolbar popup to paste a file URL, or pick a file from your computer, and press Send. • Set your device's IP address in the popup (default 192.168.4.39) and use the Test button to confirm the connection. Notes: • Works entirely on your own local network. The extension does not collect, store remotely, or transmit any of your data to the developer or third parties. • The first time you send to your device, Chrome asks permission to access your local network — allow it so the extension can reach the machine. • If a title downloads but does not boot, switch the upload mode (raw/multipart) in the popup; one suits your firmware. This is an independent hobbyist tool and is not affiliated with the makers of the Ultimate hardware or with Commodore.