<s>
The	O
IBM	B-Device
5151	I-Device
is	O
a	O
12	O
"	O
transistor	B-General_Concept
–	I-General_Concept
transistor	I-General_Concept
logic	I-General_Concept
(	O
TTL	B-General_Concept
)	O
monochrome	B-Device
monitor	I-Device
,	O
shipped	O
with	O
the	O
original	O
IBM	B-Device
Personal	I-Device
Computer	I-Device
for	O
use	O
with	O
the	O
IBM	B-Device
Monochrome	I-Device
Display	I-Device
Adapter	I-Device
.	O
</s>
<s>
A	O
few	O
other	O
cards	O
were	O
designed	O
to	O
work	O
with	O
it	O
,	O
such	O
as	O
the	O
Hercules	B-Device
Graphics	I-Device
Card	I-Device
.	O
</s>
<s>
It	O
uses	O
TTL	B-General_Concept
digital	O
inputs	O
through	O
a	O
9-pin	O
D-shell	O
connector	O
,	O
being	O
able	O
to	O
display	O
at	O
least	O
three	O
brightness	O
levels	O
,	O
according	O
to	O
the	O
different	O
pin	O
6	O
and	O
7	O
signals	O
.	O
</s>
<s>
It	O
is	O
also	O
plugged	O
into	O
the	O
female	O
AC	O
port	O
on	O
the	O
IBM	B-Device
PC	I-Device
power	O
supply	O
,	O
and	O
thus	O
did	O
not	O
have	O
a	O
power	O
switch	O
of	O
its	O
own	O
.	O
</s>
<s>
The	O
IBM	B-Device
5151	I-Device
uses	O
the	O
P39	O
phosphor	O
type	O
,	O
producing	O
a	O
bright	O
green	O
monochrome	O
image	O
intended	O
for	O
displaying	O
high-resolution	O
text	O
.	O
</s>
<s>
This	O
phosphor	O
has	O
high	O
persistence	O
,	O
which	O
decreases	O
display	B-General_Concept
flicker	I-General_Concept
but	O
causes	O
smearing	O
when	O
the	O
image	O
changes	O
.	O
</s>
