Grid Compass

Astronaut John Creighton posing with a Grid Compass aboard a Space Shuttle Discovery mission in 1985. It displays Mr. Spock of Star Trek

The Grid Compass (written GRiD by its manufacturer GRiD Systems Corporation) was arguably the first laptop computer, when the initial model, the 1101^[3] was 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 320 x 200-pixel (CGA) electroluminescent display, 340-kilobyte magnetic bubble memory, and a 1200 bit/s modem. Devices such as 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). The power input is ~110/220 V AC, 47-66 Hz, 75 W.

As a groundbreaking design, the Compass ran Grid-OS, its very own operating system. Its specialized software and high price (8-10,000 USD) meant that it was limited to specialized applications. The main buyer was the U.S. government. NASA used it on the Space Shuttle during the early 1980s, as it was both powerful and lightweight. The military Special Forces also purchased the machine, as it could be used by paratroopers in combat.

Along with the Gavilan SC and Sharp PC-5000 released the following year, the Grid Compass established much of the basic design of subsequent laptop computers, although the laptop concept itself owed much to the Dynabook project developed at Xerox PARC from the late 1960s. The Compass company subsequently earned significant returns on its patent rights as its innovations became commonplace. The first popular portable computer was the Osborne 1, sold at around the same time as the GRiD; it lacked the Compass's refinement and small size, but it was much more affordable and ran the popular CP/M operating system.

The Compass's manufacturer, Grid Systems Corp., was acquired by Tandy Corporation (RadioShack) in 1988.

External links

• GRiD UK
• GRiD Compass 1101 at oldcomputers.net
• GRiD ftp - See grid.txt
• GRiDs in Space
• GRiD at old-computers.com
• GRiD at Hrothgar's Cool Old Junk Page
• "Engineering the GRiD Compass" at Google Video

References

1. ^ ^{a b} "World's first laptop. Osborne 1 GRiD Compass 1101.". http://thelongestlistofthelongeststuffatthelongestdomainnameatlonglast.com/first407.html.  090519 thelong..last.com
2. ^ ^{a b c} "DAVES OLD COMPUTERS - PC compatibles". http://www.classiccmp.org/dunfield/pc/index.htm.  090519 classiccmp.org
3. ^ The model 1100 did not exist, except in marketing materials, the released machine was the model 1101. Pioneering the Laptop - The GRiD Compass