Floppy EMUlator (also known as "SIO2Linux")
by Pavel Machek and Preston Crow

A C program for Intel Pentium based PC's running the Linux operating system.
Like "SIO2PC" and "APE" for MSDOS PC's, this program allows you to connect
an Atari 8-bit's SIO serial port to your PC's RS232 serial port and use your
PC as though it were a disk drive.