It is indeed a Marty McFly reference. The original demo I was trying to run was called 8088 MPH and is full of Back to the Future references.

I was trying to Run Back To The Future, so I figured I'd call my emulator either Marty or McFly.

Unfortunately I found out about the FM Towns later, so I renamed it from Marty to MartyPC so you could google "MartyPC Emulator" properly.