<s>
It	O
uses	O
interchangeable	O
pre-formed	O
type	O
elements	O
,	O
each	O
with	O
typically	O
96	O
glyphs	B-Application
,	O
to	O
generate	O
high-quality	O
output	O
comparable	O
to	O
premium	O
typewriters	O
such	O
as	O
the	O
IBM	O
Selectric	O
,	O
but	O
two	O
to	O
three	O
times	O
faster	O
.	O
</s>
<s>
Daisy	O
wheel	O
printing	O
was	O
used	O
in	O
electronic	O
typewriters	O
,	O
word	B-General_Concept
processors	I-General_Concept
and	O
computers	O
from	O
1972	O
.	O
</s>
<s>
A	O
further	O
advantage	O
was	O
that	O
it	O
supported	O
the	O
entire	O
ASCII	B-Protocol
printing	O
character	O
set	O
.	O
</s>
<s>
From	O
1981	O
onwards	O
the	O
IBM	B-Device
PC	I-Device
's	O
introduction	O
of	O
"	O
Code	O
page	O
437	O
"	O
with	O
254	O
printable	O
glyphs	B-Application
(	O
including	O
40	O
shapes	O
specifically	O
for	O
drawing	O
forms	O
)	O
,	O
and	O
development	O
of	O
Xerox	O
Star-influenced	O
environments	O
such	O
as	O
the	O
Macintosh	B-Device
,	O
GEM	B-Application
and	O
Windows	B-Application
made	O
bit-mapped	O
approaches	O
more	O
desirable	O
,	O
driving	O
cost	O
reductions	O
for	O
laser	O
printing	O
and	O
higher	O
resolution	O
for	O
impact	O
dot	O
matrix	O
printing	O
.	O
</s>
<s>
In	O
use	O
a	O
servo	B-Algorithm
motor	I-Algorithm
rotates	O
the	O
daisy	O
wheel	O
to	O
position	O
the	O
required	O
character	O
between	O
the	O
hammer	O
and	O
the	O
ribbon	O
.	O
</s>
<s>
The	O
solenoid-operated	O
hammer	O
then	O
fires	O
,	O
driving	O
the	O
character	O
type	O
onto	O
the	O
ribbon	O
and	O
paper	O
to	O
print	O
the	O
character	O
on	O
the	O
paper	O
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
use	O
multiple	O
fonts	O
within	O
a	O
document	O
:	O
font	O
changing	O
is	O
facilitated	O
by	O
printer	O
device	B-Application
drivers	I-Application
which	O
can	O
position	O
the	O
carriage	O
to	O
the	O
center	O
of	O
the	O
platen	O
and	O
prompt	O
the	O
user	O
to	O
change	O
the	O
wheel	O
before	O
continuing	O
printing	O
.	O
</s>
<s>
Although	O
the	O
daisy	O
wheel	O
principle	O
is	O
basically	O
inappropriate	O
for	O
printing	O
bitmap	B-Algorithm
graphics	I-Algorithm
,	O
there	O
were	O
attempts	O
to	O
enable	O
them	O
to	O
do	O
so	O
.	O
</s>
<s>
Daisy	O
wheel	O
printers	O
are	O
capable	O
of	O
producing	O
simplified	O
graphics	O
in	O
the	O
form	O
of	O
ASCII	B-Protocol
art	O
.	O
</s>
<s>
Consideration	O
was	O
also	O
given	O
to	O
optimising	O
graphic	O
printing	O
by	O
changing	O
the	O
glyphs	B-Application
on	O
the	O
daisy	O
wheel	O
to	O
a	O
set	O
that	O
would	O
be	O
able	O
to	O
print	O
all	O
the	O
required	O
bitmap	O
combinations	O
more	O
quickly	O
,	O
without	O
requiring	O
an	O
impact	O
for	O
every	O
single	O
dot	O
.	O
</s>
