<s>
Card	B-Device
image	I-Device
is	O
a	O
traditional	O
term	O
for	O
a	O
character	O
string	O
,	O
usually	O
80	O
characters	O
in	O
length	O
,	O
that	O
was	O
,	O
or	O
could	O
be	O
,	O
contained	O
on	O
a	O
single	O
punched	B-Architecture
card	I-Architecture
.	O
</s>
<s>
IBM	B-Architecture
cards	I-Architecture
were	O
80	O
characters	O
in	O
length	O
.	O
</s>
<s>
Card	B-Device
image	I-Device
files	O
stored	O
on	O
magnetic	B-Architecture
tape	I-Architecture
or	O
disk	B-Device
were	O
usually	O
used	O
for	O
simulated	O
card	O
input	O
or	O
output	O
.	O
</s>
<s>
A	O
punched	B-Architecture
card	I-Architecture
typically	O
held	O
multiple	O
data	O
fields	O
,	O
some	O
numeric	O
,	O
some	O
alphabetic	O
.	O
</s>
<s>
Many	O
data	O
formats	O
,	O
such	O
as	O
the	O
FITS	O
image	O
file	O
format	O
,	O
still	O
use	O
card	B-Device
images	I-Device
as	O
basic	O
building	O
blocks	O
—	O
even	O
though	O
punched	B-Architecture
cards	I-Architecture
are	O
now	O
mostly	O
obsolete	O
.	O
</s>
