Transferring data from my PC to the Apple 1 Mini proved challenging.
The transfer requires a delay after each byte and a bit more delay after a carriage return.
Without these delays and a few other details, the transfer fails.

I added a simple utility that handles this upload process and I've been using it to test the small library of program code that I found for the Apple 1.
It uploads data at a whopping 29 bytes per second!
The utility seems to work very well at this point and I've enjoyed playing a few simple games on my Apple 1! :-)

Source code and binary for the utility is available from the GitHub repository.