Dayna Communications, Inc., was a privately held[1] American computer company, active from 1984 to 1997 and based in Salt Lake City, Utah.

[4] In May 1985, the company delivered the MacCharlie, a hardware add-on for the Macintosh 128K that was essentially a headless IBM PC clone, complete with one or two 5.25-inch floppy drives, that clipped onto the side of the Mac.

It connected to the Mac via a serial cable; users could run PC software through a terminal application provided through included floppy disks.

The product received positive reviews, with The New York Times calling it "a brilliant idea" that gave Apple the potential to "grow in businesses or households already committed to IBM hardware and software".

[5] The product was however a market failure, with Sadleir overspending on advertising while ignoring the needs of customers he had surveyed, the majority of which specifically wanted a means of transferring files captured in the IBM PC's FAT filesystem to the Mac while not necessarily desiring a means of running IBM PC software on the Mac.

[4] Meanwhile, the Novell collaboration eventually bore fruit with DaynaNet, a network operating system for the Mac based on and featuring interoperability with NetWare.