<s>
HeadFirst	O
Public	O
Domain	O
was	O
a	O
library	O
of	O
public	B-Application
domain	I-Application
software	I-Application
for	O
the	O
BBC	B-Device
Micro	I-Device
and	O
Acorn	B-Device
Electron	I-Device
8-bit	O
computers	O
.	O
</s>
<s>
It	O
also	O
offered	O
several	O
discs	O
of	O
software	O
for	O
the	O
Acorn	B-Device
Archimedes	I-Device
.	O
</s>
<s>
It	O
was	O
a	O
bedroom	O
enterprise	O
and	O
HeadFirst	B-Device
PD	I-Device
produced	O
paper	O
catalogues	O
of	O
its	O
products	O
.	O
</s>
<s>
The	O
catalogues	O
invited	O
people	O
to	O
buy	O
discs	O
full	O
of	O
public	B-Application
domain	I-Application
software	I-Application
from	O
HeadFirst	B-Device
PD	I-Device
for	O
£1.25	O
per	O
disc	O
.	O
</s>
<s>
There	O
are	O
relatively	O
few	O
demos	O
on	O
the	O
Acorn	B-Device
Electron	I-Device
and	O
HeadFirst	B-Device
PD	I-Device
was	O
unusual	O
in	O
that	O
it	O
released	O
the	O
majority	O
of	O
its	O
software	O
for	O
the	O
Acorn	B-Device
Electron	I-Device
,	O
not	O
the	O
more-popular	O
BBC	B-Device
Micro	I-Device
.	O
</s>
<s>
Indeed	O
,	O
several	O
of	O
the	O
better	O
HeadFirst	B-Device
PD	I-Device
demos	O
were	O
Electron-only	O
.	O
</s>
<s>
There	O
are	O
several	O
different	O
'	O
versions	O
 '	O
of	O
some	O
HeadFirst	B-Device
PD	I-Device
discs	O
,	O
as	O
the	O
demos	O
were	O
sometimes	O
revisited	O
and	O
slightly	O
improved	O
.	O
</s>
<s>
The	O
early	O
HeadFirst	B-Device
PD	I-Device
catalogues	O
,	O
for	O
example	O
,	O
typically	O
had	O
one	O
demo	O
per	O
disc	O
.	O
</s>
<s>
Not	O
all	O
games	O
on	O
HeadFirst	B-Device
PD	I-Device
discs	O
were	O
in	O
fact	O
programmed	O
by	O
HeadFirst	B-Device
PD	I-Device
.	O
</s>
<s>
Some	O
titles	O
on	O
HeadFirst	B-Device
PD	I-Device
discs	O
also	O
appear	O
on	O
BBC	O
PD	O
discs	O
and	O
Mad	O
Rabbit	O
PD	O
discs	O
.	O
</s>
<s>
HeadFirst	B-Device
PD	I-Device
was	O
closed	O
down	O
in	O
1995	O
.	O
</s>
<s>
The	O
whole	O
library	O
of	O
HeadFirst	B-Device
PD	I-Device
discs	O
was	O
'	O
lost	O
 '	O
in	O
1995	O
when	O
the	O
library	O
stopped	O
supplying	O
discs	O
.	O
</s>
<s>
In	O
2008	O
,	O
the	O
library	O
was	O
re-discovered	O
by	O
Gareth	O
Boden	O
and	O
was	O
made	O
available	O
on	O
the	O
Acorn	B-Device
Electron	I-Device
World	O
web	O
site	O
.	O
</s>
<s>
The	O
best	O
known	O
demos	O
from	O
HeadFirst	B-Device
PD	I-Device
remain	O
the	O
Invaders	O
Demo	O
and	O
the	O
Vortex	O
Demo	O
.	O
</s>
<s>
HeadFirst	B-Device
PD	I-Device
also	O
produced	O
several	O
games	O
,	O
and	O
'	O
data-packs	O
'	O
to	O
such	O
popular	O
professional	O
titles	O
of	O
the	O
day	O
such	O
as	O
White	O
Magic	O
and	O
Repton	B-Application
Infinity	I-Application
.	O
</s>
<s>
HeadFirst	B-Device
PD	I-Device
also	O
produced	O
a	O
spin-off	O
library	O
of	O
images	O
for	O
use	O
with	O
the	O
Stop	O
Press	O
64	O
desktop	O
publishing	O
program	O
.	O
</s>
