1983: Apple Lisa with Graphical User Interface and Mouse
The Apple Lisa first appeared in January 1983 and initially had two 5.25" 871K floppy disk drives. The system was quite innovative, featuring a graphical user interface and utilizing a mouse as an input device, The system had a 5MB external hard drive called the ProFile and a massive 1MB of RAM (64K was a lot at this time), both of which contributed to its whopping $9995 retail price. The high price and Apple's proprietary hold over software development resulted in poor sales. Fortunately the company had a lower cost GUI computer under development called the Macintosh.