I remember working for hours and hours, failing, to get a 32kb transfer to work between two Commodore 64's with 1650 Automodems. I wish I could remember the app

I remember working for hours and hours, failing, to get a 32kb transfer to work between two Commodore 64's with 1650 Automodems. I wish I could remember the app, it would be a nostalgia overload to see a screenshot of it again.