<s>
ReGIS	B-Application
,	O
short	O
for	O
Remote	O
Graphic	O
Instruction	O
Set	O
,	O
is	O
a	O
vector	O
graphics	O
markup	O
language	O
developed	O
by	O
Digital	O
Equipment	O
Corporation	O
(	O
DEC	O
)	O
for	O
later	O
models	O
of	O
their	O
famous	O
VT	B-Device
series	I-Device
of	O
computer	B-General_Concept
terminals	I-General_Concept
.	O
</s>
<s>
ReGIS	B-Application
supports	O
rudimentary	O
vector	O
graphics	O
consisting	O
of	O
lines	O
,	O
circular	O
arcs	O
,	O
and	O
similar	O
shapes	O
.	O
</s>
<s>
Terminals	O
supporting	O
ReGIS	B-Application
generally	O
allow	O
graphics	O
and	O
text	O
to	O
be	O
mixed	O
on-screen	O
,	O
which	O
makes	O
construction	O
of	O
graphs	O
and	O
charts	O
relatively	O
easy	O
.	O
</s>
<s>
ReGIS	B-Application
was	O
first	O
introduced	O
on	O
the	O
VT125	O
in	O
July	O
1981	O
,	O
followed	O
shortly	O
thereafter	O
by	O
the	O
VK100	O
"	O
GIGI	O
"	O
which	O
combined	O
the	O
VT125	O
display	O
system	O
with	O
composite	O
video	O
output	O
and	O
a	O
BASIC	B-Language
interpreter	O
.	O
</s>
<s>
Later	O
versions	O
of	O
the	O
VT	B-Device
series	I-Device
included	O
ReGIS	B-Application
,	O
often	O
with	O
color	O
support	O
as	O
well	O
.	O
</s>
<s>
This	O
included	O
the	O
VT240	B-Device
and	I-Device
241	I-Device
and	O
the	O
VT330	B-Application
and	I-Application
340	I-Application
.	O
</s>
<s>
ReGIS	B-Application
is	O
also	O
supported	O
by	O
a	O
small	O
number	O
of	O
terminal	B-Application
emulator	I-Application
systems	O
.	O
</s>
<s>
ReGIS	B-Application
replaced	O
an	O
earlier	O
system	O
known	O
as	O
waveform	O
graphics	O
that	O
had	O
been	O
introduced	O
on	O
the	O
VT55	B-Application
and	O
later	O
used	O
on	O
the	O
VT105	B-Application
.	O
</s>
<s>
DEC	O
normally	O
provided	O
backward	O
compatibility	O
with	O
their	O
terminals	O
,	O
but	O
in	O
this	O
case	O
the	O
waveform	O
system	O
was	O
simply	O
dropped	O
when	O
ReGIS	B-Application
was	O
introduced	O
.	O
</s>
<s>
ReGIS	B-Application
consists	O
of	O
five	O
primary	O
drawing	O
commands	O
and	O
a	O
selection	O
of	O
status	O
and	O
device	O
control	O
commands	O
.	O
</s>
<s>
ReGIS	B-Application
mode	O
is	O
entered	O
by	O
specifying	O
the	O
escape	O
code	O
sequence	O
,	O
and	O
exited	O
with	O
.	O
</s>
<s>
The	O
sequence	O
is	O
the	O
generic	O
Device	O
Control	O
String	O
(	O
DCS	O
)	O
used	O
in	O
the	O
VT	B-Device
series	I-Device
of	O
terminals	O
,	O
and	O
is	O
also	O
used	O
for	O
a	O
variety	O
of	O
other	O
commands	O
.	O
</s>
<s>
Any	O
command	O
that	O
moved	O
the	O
pen	O
leaves	O
it	O
there	O
for	O
the	O
next	O
operation	O
,	O
similar	O
to	O
the	O
operation	O
of	O
a	O
mechanical	O
plotter	B-Operating_System
.	O
</s>
<s>
Later	O
models	O
,	O
starting	O
with	O
the	O
VT240	B-Device
and	O
VT241	B-Device
,	O
provide	O
the	O
full	O
480	O
pixel	O
vertical	O
resolution	O
.	O
</s>
<s>
Some	O
ReGIS	B-Application
terminals	O
support	O
color	O
,	O
using	O
a	O
series	O
of	O
registers	O
.	O
</s>
<s>
Finally	O
,	O
ReGIS	B-Application
allows	O
commands	O
to	O
be	O
stored	O
into	O
a	O
macrograph	O
and	O
then	O
recalled	O
using	O
the	O
@	O
operator	O
.	O
</s>
<s>
This	O
code	O
enters	O
ReGIS	B-Application
mode	O
and	O
uses	O
the	O
S	O
command	O
to	O
erase	O
the	O
screen	O
with	O
(	O
E	O
)	O
and	O
then	O
turns	O
on	O
the	O
visible	O
cursor	O
with	O
(	O
C1	O
)	O
.	O
</s>
