<s>
The	O
Kodak	O
Professional	O
Digital	O
Camera	O
System	O
or	O
DCS	O
,	O
later	O
unofficially	O
named	O
DCS	B-Device
100	I-Device
,	O
was	O
the	O
first	O
commercially	O
available	O
digital	B-Device
single-lens	I-Device
reflex	I-Device
(	O
DSLR	B-Device
)	O
camera	O
.	O
</s>
<s>
It	O
was	O
a	O
customized	O
camera	O
back	O
bearing	O
the	O
digital	O
image	O
sensor	O
,	O
mounted	O
on	O
a	O
Nikon	B-Algorithm
F3	I-Algorithm
body	O
and	O
released	O
by	O
Kodak	O
in	O
May	O
1991	O
;	O
the	O
company	O
had	O
previously	O
shown	O
the	O
camera	O
at	O
Photokina	O
in	O
1990	O
.	O
</s>
<s>
Aimed	O
at	O
the	O
photo	O
journalism	O
market	O
in	O
order	O
to	O
improve	O
the	O
speed	O
with	O
which	O
photographs	O
could	O
be	O
transmitted	O
back	O
to	O
the	O
studio	O
or	O
newsroom	O
,	O
the	O
DCS	O
had	O
a	O
resolution	B-Algorithm
of	O
1.3	O
megapixels	O
.	O
</s>
<s>
The	O
DCS	B-Device
100	I-Device
was	O
publicly	O
presented	O
for	O
the	O
first	O
time	O
in	O
Arles	O
(	O
France	O
)	O
,	O
at	O
the	O
Journées	O
de	O
l'Image	O
Pro	O
by	O
Mr	O
Ray	O
H	O
.	O
DeMoulin	O
,	O
the	O
worldwide	O
President	O
of	O
the	O
Eastman	O
Kodak	O
Company	O
.	O
</s>
<s>
A	O
1.3	O
megapixel	O
imager	O
had	O
been	O
produced	O
by	O
Kodak	O
’s	O
Microelectronics	O
Technology	O
Division	O
and	O
the	O
logical	O
next	O
step	O
was	O
to	O
build	O
a	O
high	B-Algorithm
resolution	I-Algorithm
digital	O
imaging	O
system	O
around	O
it	O
.	O
</s>
<s>
The	O
battery	O
power	O
and	O
a	O
hard	B-Device
drive	I-Device
were	O
integrated	O
into	O
a	O
tethered	O
remote	O
system	O
to	O
be	O
worn	O
on	O
the	O
shoulder	O
while	O
the	O
photographer	O
worked	O
.	O
</s>
<s>
Finally	O
,	O
since	O
the	O
1.3MP	O
imager	O
was	O
smaller	O
than	O
the	O
full	B-Algorithm
35mm	O
film	O
frame	O
,	O
colored	O
templates	O
were	O
added	O
to	O
the	O
viewfinder	O
to	O
indicate	O
the	O
area	O
the	O
imager	O
would	O
capture	O
.	O
</s>
<s>
The	O
DCS	B-Device
100	I-Device
retained	O
many	O
of	O
the	O
characteristics	O
of	O
the	O
prototype	O
,	O
including	O
a	O
separate	O
shoulder	O
carried	O
Digital	O
Storage	O
Unit	O
(	O
DSU	O
)	O
to	O
store	O
and	O
to	O
visualize	O
the	O
images	O
,	O
and	O
to	O
house	O
the	O
batteries	O
.	O
</s>
<s>
The	O
DSU	O
contained	O
a	O
200	O
megabyte	O
hard	B-Device
disk	I-Device
drive	I-Device
that	O
could	O
store	O
up	O
to	O
156	O
images	O
without	O
compression	B-General_Concept
,	O
or	O
up	O
to	O
600	O
images	O
using	O
a	O
JPEG	O
compatible	O
compression	B-General_Concept
board	O
that	O
was	O
offered	O
later	O
as	O
an	O
optional	O
extra	O
.	O
</s>
<s>
An	O
external	O
keyboard	B-Device
allowed	O
entry	O
of	O
captions	O
and	O
other	O
image	O
information	O
.	O
</s>
<s>
Internally	O
,	O
It	O
has	O
a	O
3.5	O
"	O
SCSI	B-Architecture
hard	B-Device
drive	I-Device
.	O
</s>
<s>
It	O
connects	O
to	O
a	O
computer	O
via	O
an	O
external	O
SCSI	B-Architecture
interface	O
.	O
</s>
<s>
It	O
appears	O
as	O
a	O
non-disk	O
SCSI	B-Architecture
device	O
,	O
and	O
can	O
be	O
accessed	O
by	O
a	O
TWAIN-based	O
plugin	O
for	O
Photoshop	O
3	O
.	O
</s>
<s>
There	O
were	O
many	O
models	O
of	O
the	O
DCS	B-Device
100	I-Device
with	O
different	O
buffers	O
,	O
monochrome	O
,	O
color	O
,	O
transmission	O
versions	O
with	O
keyboard	B-Device
and	O
modem	O
.	O
</s>
