Linking to emulator

Has anyone got any idea why this emulator won’t link directly? It accepts code from the address bar and links from scruss.com okay https://scruss.com/blog/2018/07/02/moar-10print-nonsense/

I want to be able to enter code into the emulator directly via a link. When I try I just get a grey screen. The emulator itself is in 6128.rom which is in the same directory on the server as 6128.rom

Thanks