<s>
RCA	O
's	O
VP	O
3000	O
Interactive	O
Data	B-General_Concept
Terminals	I-General_Concept
were	O
a	O
family	O
of	O
portable	O
computer	B-General_Concept
terminals	I-General_Concept
housed	O
in	O
compact	O
keyboard-like	O
cases	O
,	O
but	O
notable	O
for	O
their	O
use	O
of	O
a	O
color-coded	O
membrane	B-Device
keyboard	I-Device
.	O
</s>
<s>
The	O
systems	O
supported	O
color	O
output	O
to	O
a	O
television	O
with	O
20	O
and	O
40	O
character-per-line	O
modes	O
,	O
and	O
an	O
optional	O
built-in	O
modem	B-Application
.	O
</s>
<s>
The	O
VP	O
series	O
started	O
life	O
as	O
an	O
upgrade	O
to	O
RCA	O
's	O
COSMAC	B-Device
VIP	I-Device
kit-computer	O
,	O
originally	O
to	O
be	O
known	O
as	O
the	O
VIP	O
II	O
.	O
</s>
<s>
Instead	O
,	O
the	O
design	O
was	O
re-purposed	O
as	O
a	O
terminal	O
system	O
by	O
replacing	O
the	O
ROMs	B-Device
with	O
ones	O
containing	O
a	O
simple	O
terminal	B-Application
program	I-Application
and	O
optionally	O
adding	O
a	O
modem	B-Application
.	O
</s>
<s>
The	O
main	O
model	O
,	O
the	O
VP	O
3501	O
included	O
a	O
300bit/s	O
modem	B-Application
,	O
an	O
RF	O
modulator	O
for	O
connection	O
to	O
any	O
conventional	O
color	O
television	O
,	O
and	O
the	O
keyboard	O
included	O
a	O
16-key	O
numeric	B-Device
keypad	I-Device
.	O
</s>
<s>
The	O
VP	O
3303	O
removed	O
the	O
modem	B-Application
and	O
keypad	O
,	O
while	O
the	O
VP	O
3301	O
removed	O
the	O
RF	O
modulator	O
as	O
well	O
.	O
</s>
<s>
The	O
VP	O
611	O
replaced	O
the	O
616	O
's	O
serial	O
port	O
with	O
an	O
8-bit	O
parallel	B-Device
port	I-Device
,	O
suitable	O
for	O
being	O
feeding	O
into	O
a	O
typical	O
microcomputer	B-Architecture
keyboard	O
controller	O
like	O
the	O
one	O
on	O
most	O
S-100	B-Architecture
bus	I-Architecture
machines	O
.	O
</s>
