<s>
The	O
Visual	B-Device
50	I-Device
is	O
a	O
terminal	O
created	O
by	O
Visual	O
Technology	O
,	O
Inc.	O
,	O
which	O
was	O
located	O
in	O
Tewksbury	O
,	O
Massachusetts	O
.	O
</s>
<s>
It	O
merged	O
with	O
White	O
Pine	O
Software	O
in	O
1993	O
,	O
which	O
became	O
CU-SeeMe	B-Protocol
Networks	O
,	O
in	O
turn	O
absorbed	O
into	O
RadVision	O
in	O
2001	O
.	O
</s>
<s>
The	O
terminal	O
consists	O
of	O
a	O
monitor	B-Device
which	O
is	O
the	O
main	O
component	O
and	O
a	O
keyboard	B-Device
.	O
</s>
<s>
It	O
was	O
used	O
as	O
a	O
computer	B-General_Concept
terminal	I-General_Concept
so	O
there	O
are	O
no	O
internal	O
drives	O
or	O
daughter	B-Device
cards	I-Device
.	O
</s>
<s>
The	O
primary	O
component	O
in	O
the	O
case	O
is	O
a	O
motherboard	B-Device
with	O
a	O
modem	O
port	O
,	O
keyboard	B-Device
port	O
,	O
and	O
an	O
aux	O
.	O
</s>
<s>
Termcap	B-Application
provides	O
support	O
for	O
the	O
Visual	B-Device
50	I-Device
by	O
way	O
of	O
the	O
entries	O
named	O
v50	O
,	O
vi50	O
,	O
v50am	O
,	O
or	O
visual50	O
,	O
depending	O
on	O
the	O
system	O
.	O
</s>
<s>
The	O
terminal	O
uses	O
on	O
an	O
SGS	O
(	O
now	O
STMicroelectronics	O
)	O
Z8400AB1	O
CPU	B-Device
,	O
based	O
on	O
the	O
Zilog	B-General_Concept
Z80A	I-General_Concept
CPU	B-Device
.	O
</s>
<s>
This	O
CPU	B-Device
has	O
an	O
8	O
bit	O
data	O
bus	O
and	O
a	O
16	O
bit	O
address	O
bus	O
,	O
and	O
runs	O
at	O
4MHz	O
.	O
</s>
<s>
The	O
keyboard	B-Device
is	O
a	O
Keytronic	O
A65-0248	O
,	O
attached	O
by	O
a	O
4	O
wire	O
telephone	O
cord	O
.	O
</s>
<s>
The	O
keyboard	B-Device
uses	O
an	O
Intel	B-Device
P8048H	I-Device
MCU	B-Architecture
,	O
a	O
common	O
MCU	B-Architecture
for	O
keyboards	B-Device
.	O
</s>
