<s>
The	O
HP	B-Device
7470	I-Device
was	O
a	O
small	O
low-cost	O
desktop	O
pen	O
plotter	B-Operating_System
introduced	O
by	O
Hewlett	O
Packard	O
's	O
San	O
Diego	O
division	O
in	O
1982	O
.	O
</s>
<s>
The	O
HP	B-Device
7470	I-Device
had	O
two	O
pens	O
,	O
one	O
on	O
either	O
side	O
and	O
plotted	O
on	O
ANSI	O
A	O
(	O
8.5	O
x	O
11	O
inch	O
)	O
or	O
A4-sized	O
paper	O
.	O
</s>
<s>
The	O
HP	B-Device
7475	I-Device
used	O
a	O
rotating	O
carousel	O
with	O
six	O
pens	O
.	O
</s>
<s>
That	O
plotter	B-Operating_System
was	O
used	O
in	O
greeting	O
card	O
kiosks	O
.	O
</s>
<s>
This	O
design	O
was	O
also	O
scaled	O
up	O
for	O
very	O
large	O
pen	O
plotters	B-Operating_System
.	O
</s>
<s>
These	O
were	O
driven	O
by	O
the	O
HP-GL	B-Language
plotter	B-Operating_System
language	O
which	O
used	O
ASCII	B-Protocol
commands	O
such	O
as	O
PA	O
300	O
,	O
4500	O
;	O
PD	O
;	O
.	O
</s>
<s>
The	O
plotter	B-Operating_System
had	O
three	O
electrical	O
interfaces	O
:	O
HP-IB	O
,	O
RS-232	O
,	O
and	O
HP-IL	B-Architecture
for	O
HP	O
handheld	O
calculators	O
.	O
</s>
<s>
Pen	O
plotters	B-Operating_System
became	O
obsolete	O
with	O
the	O
adoption	O
of	O
ink-jet	O
printers	O
,	O
and	O
processors	O
fast	O
enough	O
to	O
rasterize	O
complex	O
images	O
.	O
</s>
<s>
Houston	O
Instrument	O
and	O
other	O
manufacturers	O
would	O
follow	O
with	O
similar	O
plotters	B-Operating_System
.	O
</s>
