The Grid Compass 1100 (written GRiD by its manufacturer) was arguably the first laptop computer, introduced in April 1982. The computer was designed by British industrial designer Bill Moggridge in 1979, and first sold three years later. The design used a clamshell case (where the screen folds flat to the rest of the computer when closed), which was made from a magnesium alloy. The computer featured an Intel 8086 processor, a 320x200-pixel (CGA) electroluminescent display, 340-kilobyte magnetic bubble memory, and a 1200 bit/s modem. Devices like hard drives and floppy drives could be connected via the 488 I/O (also known as the GPIB or General Purpose Instrumentation Bus). This port made it possible to connect multiple devices in a daisy-chain. It weighed 5 kg (11 lb).