<s>
EFTP	B-Protocol
was	O
a	O
very	O
simple	O
file	B-Protocol
transfer	I-Protocol
protocol	O
developed	O
as	O
part	O
of	O
the	O
PARC	B-Protocol
Universal	I-Protocol
Packet	I-Protocol
protocol	I-Protocol
suite	I-Protocol
at	O
Xerox	O
PARC	O
in	O
the	O
late	O
1970s	O
.	O
</s>
<s>
It	O
was	O
the	O
inspiration	O
for	O
the	O
Trivial	B-Device
File	I-Device
Transfer	I-Device
Protocol	I-Device
(	O
TFTP	B-Device
)	O
in	O
the	O
TCP/IP	B-Protocol
suite	I-Protocol
.	O
</s>
<s>
As	O
with	O
its	O
descendant	O
,	O
TFTP	B-Device
,	O
it	O
did	O
not	O
use	O
the	O
reliable	O
byte	O
stream	O
protocol	O
of	O
the	O
suite	O
(	O
Byte	O
Stream	O
Protocol	O
in	O
the	O
case	O
of	O
PUP	O
)	O
;	O
rather	O
,	O
it	O
ran	O
directly	O
on	O
top	O
of	O
the	O
basic	O
internetwork	B-Architecture
layer	O
.	O
</s>
<s>
(	O
An	O
early	O
version	O
of	O
EFTP	B-Protocol
ran	O
on	O
top	O
of	O
bare	O
Ethernet	O
packets	B-Protocol
.	O
)	O
</s>
<s>
Also	O
,	O
like	O
TFTP	B-Device
,	O
it	O
was	O
a	O
simple	O
lock-step	O
protocol	O
;	O
there	O
was	O
only	O
ever	O
one	O
packet	B-Protocol
outstanding	O
at	O
any	O
time	O
,	O
and	O
every	O
packet	B-Protocol
received	O
by	O
either	O
party	O
caused	O
one	O
packet	B-Protocol
to	O
be	O
sent	O
in	O
reply	O
(	O
until	O
the	O
termination	O
of	O
the	O
transfer	O
)	O
.	O
</s>
<s>
Unlike	O
TFTP	B-Device
,	O
it	O
made	O
no	O
provisions	O
for	O
sending	O
the	O
file-name	O
as	O
part	O
of	O
transfers	O
,	O
so	O
it	O
could	O
only	O
be	O
used	O
either	O
in	O
places	O
that	O
did	O
n't	O
need	O
a	O
file	O
name	O
(	O
as	O
with	O
spooling	B-Device
)	O
,	O
or	O
in	O
conjunction	O
with	O
another	O
protocol	O
that	O
provided	O
the	O
file-name	O
(	O
as	O
in	O
booting	B-Operating_System
)	O
.	O
</s>
<s>
Since	O
EFTP	B-Protocol
was	O
so	O
simple	O
,	O
it	O
was	O
easy	O
to	O
implement	O
in	O
a	O
very	O
small	O
amount	O
of	O
memory	B-General_Concept
,	O
an	O
important	O
consideration	O
at	O
that	O
time	O
.	O
</s>
<s>
It	O
was	O
used	O
for	O
booting	B-Operating_System
Xerox	B-Device
Altos	I-Device
over	O
the	O
Ethernet	O
,	O
and	O
also	O
to	O
send	O
files	O
to	O
the	O
print	B-Device
spoolers	I-Device
of	O
laser	O
printers	O
.	O
</s>
<s>
Various	O
expansions	O
of	O
the	O
initialism	O
EFTP	B-Protocol
have	O
been	O
given	O
,	O
including	O
Easy	B-Protocol
File	I-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
,	O
Ether	B-Protocol
File	I-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
,	O
and	O
Experimental	B-Protocol
File	I-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
.	O
</s>
