GridCase (stylized as GRiDCASE) is a line of rugged tablets and laptops by Grid Systems Corporation released as a successor of the GRiD Compass line. History The first model was released in 1985. The notable model - GRiDCASE 1535EXP - is a rugged laptop designed for NASA to be used in space, and becomes the first rugged portable PC to attain full TEMPEST accreditation from the NSA. Models Former line GRiDCASE 2 1985; low-contrast LCD screen with green background (instead of orange/yellow plasma screen with black background on a Compass laptops). This model was based on a MSDOS 2.11 and a bunch of apps burned on ROM that fit in the ROM tray in front. GRiDCASE 3 1986; returning to a plasma screens (but with red/orange text color and wide aspect ratio). The internal power supply can be ejected and a battery-pack is installed in its place. 3D view:http://vintage-laptops.com/en/grid-case-3 GRiDCASE 3 Tempest 1986; the rugged version of GRiDCASE 3 with electromagnetic protection. 3D view:http://vintage-laptops.com/en/grid-case-tempest GRiDCASE 1520 1988; can be equipped with plasma or LCD screen. Was based on a 286 CPU. 3D view:http://vintage-laptops.com/en/grid-case-1520 GRiDCASE 1530 The modification of 1530 - the Grid GRiDCASE 1535EXP is a rugged laptop with a 80386 CPU, an optional 80387 floating point processor and up to 8 Mbyte of DRAM. It was first flown into space in December 1992 on the STS-53 for use of the HERCULES geolocation device. The another modification - the Grid GRiDCASE 1537EXP - has another screen (640x480 instead of 640x400, but with less physical size). The power input is 100-240 V AC 50/60/400 Hz, 80 W. The 400 Hz utility frequency is common on airplanes and submarines. 3D view:http://vintage-laptops.com/en/grid-case-1537e GRiDCASE 1550 1990; This model has integrated pointing device, an was based on a Intel 80386sx processor. The 1550sx wersion has 4M RAM, have a 100 M hard disk, a 1.44 M floppy drive, a hardly visible B/W VGA-LCD screen, a built in 2400 bps modem and weights 5.5 Kg (12 lbs.) without battery or power supply. 3D view:http://vintage-laptops.com/en/grid-case-1550sx Tandy GRiD laptops In the period from 1990-1994, the Tandy Corp. together with the GRiD Systems Corp.produced the following models: GRiD 1450SX -3D view:http://vintage-laptops.com/en/grid-1450sx GRiD 1810 -3D view:http://vintage-laptops.com/en/grid-1810 GRiD 1660 and 1660C -3D view:http://vintage-laptops.com/en/grid-1660 GRiD 1680 and 1680C -3D view:http://vintage-laptops.com/en/grid-1680 GRiD 1720, 1750, 1755 -3D view:http://vintage-laptops.com/en/grid-1755 GRiD 4025N and 4025NC -3D view:http://vintage-laptops.com/en/grid-4025nc GRiD Defence Systems GRiDCASE Reintroduced in 1995 line. GRiDCASE 1580