<s>
GridCase	B-General_Concept
(	O
stylized	O
as	O
GRiDCASE	B-General_Concept
)	O
is	O
a	O
line	O
of	O
rugged	B-Device
tablets	B-Device
and	O
laptops	B-Device
by	O
Grid	O
Systems	O
Corporation	O
released	O
as	O
a	O
successor	O
of	O
the	O
GRiD	O
Compass	O
line	O
.	O
</s>
<s>
The	O
notable	O
model	O
-	O
GRiDCASE	B-General_Concept
1535EXP	O
-	O
is	O
a	O
rugged	B-Device
laptop	I-Device
designed	O
for	O
NASA	O
to	O
be	O
used	O
in	O
space	O
,	O
and	O
becomes	O
the	O
first	O
rugged	B-Device
portable	O
PC	O
to	O
attain	O
full	O
TEMPEST	O
accreditation	O
from	O
the	O
NSA	O
.	O
</s>
<s>
GRiDCASE	B-General_Concept
models1980's1990's2000's2010's2020's198519861987198819891990199119921993199419951996199719981999LaptopsRegular	O
rugged23152015301550Tandy	O
GRiD	O
laptops1580	O
colspan	O
=	O
"	O
6	O
"	O
Fully	O
ruggedSubnotebook	O
colspan	O
=	O
"	O
17	O
"	O
1510Regular	O
size	O
Tempest	O
colspan	O
=	O
"	O
2	O
"	O
1535	O
;	O
1537Tandy	O
GRiD	O
laptops1580T	O
(	O
Tempest	O
)	O
1580	O
XGA15901513	O
;	O
</s>
<s>
1985	O
;	O
low-contrast	O
LCD	O
screen	O
with	O
green	O
background	O
(	O
instead	O
of	O
orange/yellow	O
plasma	O
screen	O
with	O
black	O
background	O
on	O
a	O
Compass	O
laptops	B-Device
)	O
.	O
</s>
<s>
This	O
model	O
was	O
based	O
on	O
a	O
MSDOS	B-Application
2.11	I-Application
and	O
a	O
bunch	O
of	O
apps	O
burned	O
on	O
ROM	O
that	O
fit	O
in	O
the	O
ROM	O
tray	O
in	O
front	O
.	O
</s>
<s>
1986	O
;	O
returning	O
to	O
a	O
plasma	O
screens	O
(	O
but	O
with	O
red/orange	O
text	O
color	O
and	O
wide	O
aspect	B-General_Concept
ratio	I-General_Concept
)	O
.	O
</s>
<s>
1986	O
;	O
the	O
rugged	B-Device
version	O
of	O
GRiDCASE	B-General_Concept
3	O
with	O
electromagnetic	O
protection	O
.	O
</s>
<s>
Was	O
based	O
on	O
a	O
286	B-General_Concept
CPU	B-Device
.	O
</s>
<s>
The	O
modification	O
of	O
1530	O
-	O
the	O
Grid	B-General_Concept
GRiDCASE	I-General_Concept
1535EXP	I-General_Concept
is	O
a	O
rugged	B-Device
laptop	I-Device
with	O
a	O
80386	B-General_Concept
CPU	B-Device
,	O
an	O
optional	O
80387	O
floating	B-General_Concept
point	I-General_Concept
processor	I-General_Concept
and	O
up	O
to	O
8	O
Mbyte	O
of	O
DRAM	O
.	O
</s>
<s>
It	O
was	O
first	O
flown	O
into	O
space	O
in	O
December	O
1992	O
on	O
the	O
STS-53	O
for	O
use	O
of	O
the	O
HERCULES	B-Algorithm
geolocation	O
device	O
.	O
</s>
<s>
The	O
another	O
modification	O
-	O
the	O
Grid	B-General_Concept
GRiDCASE	I-General_Concept
1537EXP	O
-	O
has	O
another	O
screen	O
(	O
640x480	O
instead	O
of	O
640x400	O
,	O
but	O
with	O
less	O
physical	O
size	O
)	O
.	O
</s>
<s>
Pentium	O
and	O
pointing	B-Device
stick	I-Device
(	O
initial	O
model	O
,	O
1995	O
)	O
or	O
Pentium	O
II	O
and	O
touchpad	O
(	O
1580	O
XGA	O
,	O
1998	O
)	O
.	O
</s>
