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. The first model was released in 1985.
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 with red plasma screen
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.[5]
1990;[6] This model has an integrated pointing device,[6] and was based on an Intel 80386sx processor.
The 1550sx version has 4 MB RAM, a 100 MB hard disk, a 1.44 MB 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.[8]