I recently saw a video made by the famous "The 8 Bit Guy" about PE6502 computer. At 19:41, he successfully sent a text file from his Windows 95 laptop to the PE6502 using only a standard serial cable.
I got interested in this topic and looked if anyone had ever come up with something similar to send text to the Commodore 64 (I am a C64 newbie btw).
I found that there were many similar projects, but they all used UserPort on the C64 side, rather than SerialPort, and I am not sure why they used that port. They also required special software for the C64.
Is it possible to transfer text or files from PC to C64 without any software on the C64 side, using similar method as on 8BitGuy's video? If so, how to do it?