<s>
The	O
Happy	B-Device
Hacking	I-Device
Keyboard	I-Device
(	O
HHKB	B-Device
)	O
is	O
a	O
small	O
computer	B-Device
keyboard	I-Device
produced	O
by	O
PFU	O
Limited	O
of	O
Japan	O
,	O
codeveloped	O
with	O
Japanese	O
computer	O
scientist	O
and	O
pioneer	O
Eiiti	O
Wada	O
.	O
</s>
<s>
It	O
returns	O
the	O
control	B-Device
key	I-Device
to	O
its	O
original	O
position	O
as	O
on	O
the	O
early	O
84-key	O
IBM	B-Operating_System
Personal	I-Operating_System
Computer/AT	I-Operating_System
and	O
XT	B-Device
layouts	O
.	O
</s>
<s>
The	O
current	O
models	O
in	O
production	O
are	O
the	O
Happy	B-Device
Hacking	I-Device
Keyboard	I-Device
Professional	O
Classic	O
,	O
Professional	O
Hybrid	O
(	O
wired/wireless	O
dual	O
connectivity	O
)	O
,	O
and	O
Professional	O
Hybrid	O
Type-S	O
(	O
silenced	O
variant	O
of	O
Hybrid	O
)	O
all	O
in	O
either	O
dark	O
or	O
light	O
colorways	O
,	O
and	O
either	O
blank	O
or	O
printed	O
keycaps	O
.	O
</s>
<s>
Frustrated	O
that	O
each	O
new	O
computer	O
system	O
came	O
with	O
a	O
new	O
keyboard	B-Device
layout	O
that	O
became	O
increasingly	O
complex	O
,	O
Wada	O
sought	O
to	O
create	O
his	O
own	O
keyboard	B-Device
that	O
he	O
could	O
continue	O
to	O
use	O
with	O
various	O
different	O
computer	O
systems	O
.	O
</s>
<s>
Inspired	O
by	O
the	O
original	B-Device
Macintosh	I-Device
keyboard	B-Device
,	O
Professor	O
Wada	O
and	O
PFU	O
collaborated	O
to	O
design	O
the	O
Happy	B-Device
Hacking	I-Device
Keyboard	I-Device
with	O
the	O
following	O
philosophy	O
:	O
</s>
<s>
During	O
the	O
design	O
process	O
,	O
Wada	O
had	O
mock-ups	O
of	O
the	O
keyboard	B-Device
both	O
with	O
printed	O
and	O
blank	O
keycaps	O
;	O
he	O
found	O
that	O
his	O
students	O
quite	O
liked	O
blank	O
keycaps	O
and	O
the	O
tradition	O
of	O
HHKB	B-Device
's	O
with	O
blank	O
keycaps	O
continues	O
to	O
this	O
day	O
.	O
</s>
<s>
The	O
first	O
Happy	B-Device
Hacking	I-Device
keyboard	I-Device
(	O
HHKB	B-Device
)	O
was	O
released	O
in	O
1996	O
and	O
used	O
membrane	B-Device
keyswitches	O
.	O
</s>
<s>
It	O
used	O
PS/2	B-Protocol
,	O
Sun	O
,	O
and	O
ADB	B-Device
interfaces	O
to	O
connect	O
to	O
a	O
computer	O
with	O
a	O
detachable	O
cable	O
and	O
is	O
only	O
available	O
in	O
white	O
.	O
</s>
<s>
The	O
first	O
HHKB	B-Device
was	O
followed	O
by	O
the	O
release	O
of	O
the	O
HHKB	B-Device
Lite	O
and	O
HHKB	B-Device
Lite2	O
in	O
1999	O
and	O
2001	O
respectively	O
.	O
</s>
<s>
The	O
HHKB	B-Device
Lite	O
models	O
also	O
used	O
membrane	B-Device
keyswitches	O
but	O
have	O
a	O
slightly	O
different	O
layout	O
than	O
the	O
standard	O
HHKB	B-Device
.	O
</s>
<s>
The	O
HHKB	B-Device
Lite	O
is	O
the	O
first	O
HHKB	B-Device
model	O
to	O
be	O
available	O
in	O
black	O
and	O
the	O
HHKB	B-Device
Lite2	O
is	O
the	O
first	O
HHKB	B-Device
model	O
to	O
use	O
the	O
USB	B-Protocol
interface	O
.	O
</s>
<s>
The	O
first	O
HHKB	B-Device
Professional	O
(	O
not	O
to	O
be	O
confused	O
with	O
the	O
previously	O
mentioned	O
first	O
HHKB	B-Device
)	O
was	O
released	O
in	O
December	O
2003	O
and	O
is	O
available	O
in	O
either	O
white	O
or	O
charcoal	O
(	O
black	O
)	O
colorways	O
with	O
either	O
blank	O
or	O
printed	O
keycaps	O
.	O
</s>
<s>
Retroactively	O
known	O
as	O
the	O
HHKB	B-Device
Professional	O
1	O
,	O
this	O
is	O
the	O
first	O
HHKB	B-Device
model	O
to	O
use	O
the	O
famous	O
Topre	O
electrostatic	O
capacitive	O
keyswitches	O
that	O
all	O
subsequent	O
models	O
use	O
to	O
this	O
day	O
.	O
</s>
<s>
It	O
also	O
features	O
a	O
detachable	O
mini-USB	O
cable	O
which	O
is	O
used	O
to	O
connect	O
the	O
keyboard	B-Device
to	O
a	O
computer	O
.	O
</s>
<s>
The	O
HHKB	B-Device
Professional	O
2	O
was	O
released	O
in	O
March	O
2006	O
and	O
is	O
also	O
available	O
in	O
either	O
white	O
or	O
charcoal	O
(	O
black	O
)	O
with	O
either	O
blank	O
or	O
printed	O
keycaps	O
.	O
</s>
<s>
Its	O
main	O
feature	O
is	O
a	O
built-in	O
2-port	O
USB	B-Protocol
hub	O
for	O
connecting	O
mice	O
and	O
other	O
peripherals	O
.	O
</s>
<s>
In	O
2011	O
,	O
PFU	O
released	O
the	O
HHKB	B-Device
Professional	O
2	O
Type-S	O
.	O
Only	O
available	O
in	O
white	O
(	O
but	O
with	O
either	O
blank	O
or	O
printed	O
keycaps	O
)	O
,	O
the	O
HHKB	B-Device
Professional	O
2	O
Type-S	O
is	O
a	O
silenced	O
variant	O
of	O
the	O
HHKB	B-Device
Professional	O
2	O
containing	O
silenced	O
Topre	O
keyswitches	O
.	O
</s>
<s>
Another	O
variant	O
of	O
the	O
HHKB	B-Device
Professional	O
2	O
called	O
the	O
HHKB	B-Device
Professional	O
BT	O
,	O
was	O
released	O
in	O
2016	O
.	O
</s>
<s>
This	O
is	O
the	O
first	O
HHKB	B-Device
to	O
feature	O
Bluetooth	B-Protocol
connectivity	O
.	O
</s>
<s>
HHKB	B-Device
Professional	O
BT	O
models	O
run	O
on	O
AA	O
batteries	O
housed	O
in	O
a	O
"	O
battery	O
bump	O
"	O
on	O
the	O
rear	O
of	O
the	O
keyboard	B-Device
and	O
can	O
only	O
be	O
connected	O
using	O
Bluetooth	B-Protocol
(	O
although	O
these	O
models	O
have	O
a	O
micro-USB	O
port	O
,	O
it	O
can	O
only	O
be	O
used	O
to	O
power	O
the	O
keyboard	B-Device
in	O
place	O
of	O
batteries	O
and	O
not	O
for	O
data	O
transmission	O
)	O
.	O
</s>
<s>
The	O
third-generation	O
models	O
of	O
HHKB	B-Device
Professional	O
:	O
Classic	O
,	O
Hybrid	O
,	O
and	O
Hybrid	O
Type-S	O
–	O
were	O
released	O
in	O
December	O
2019	O
.	O
</s>
<s>
These	O
third-generation	O
models	O
feature	O
100%	O
PBT	O
keycaps	O
,	O
where	O
previous	O
models	O
used	O
ABS	O
for	O
the	O
space	B-Device
bar	I-Device
.	O
</s>
<s>
Furthermore	O
,	O
the	O
third-generation	O
models	O
feature	O
USB-C	O
connectivity	O
instead	O
of	O
mini-USB	O
.	O
</s>
<s>
HHKB	B-Device
Professional	O
Hybrid	O
models	O
run	O
on	O
AA	O
batteries	O
housed	O
in	O
a	O
"	O
battery	O
bump	O
"	O
,	O
similar	O
to	O
the	O
previous	O
HHKB	B-Device
Professional	O
BT	O
.	O
</s>
<s>
However	O
,	O
unlike	O
the	O
HHKB	B-Device
Professional	O
BT	O
,	O
these	O
models	O
can	O
also	O
be	O
used	O
with	O
a	O
wired	O
connection	O
via	O
the	O
USB-C	O
port	O
.	O
</s>
<s>
HHKB	B-Device
Professional	O
Hybrid	O
models	O
also	O
support	O
PFU	O
's	O
official	O
key	O
remapping	O
software	O
.	O
</s>
<s>
Some	O
of	O
the	O
Happy	B-Device
Hacking	I-Device
Keyboard	I-Device
design	O
tenets	O
,	O
as	O
dictated	O
by	O
Wada	O
,	O
include	O
a	O
minimal	O
60-key	O
design	O
,	O
no	O
cursor	O
or	O
function	O
keys	O
,	O
and	O
standard	O
keyboard	B-Device
pitch	O
,	O
all	O
optimized	O
for	O
use	O
in	O
Unix	B-Application
environments	O
.	O
</s>
<s>
Happy	B-Device
Hacking	I-Device
Keyboards	I-Device
lack	O
a	O
numeric	B-Device
keypad	I-Device
,	O
and	O
keys	O
outside	O
the	O
typewriter	O
key	O
area	O
are	O
mainly	O
accessible	O
through	O
the	O
Fn	B-Device
key	I-Device
.	O
</s>
<s>
The	O
keys	O
are	O
arranged	O
in	O
a	O
layout	O
resembling	O
the	O
Sun	O
Type	O
3	O
keyboard	B-Device
.	O
</s>
<s>
The	O
control	B-Device
key	I-Device
is	O
placed	O
where	O
most	O
keyboards	B-Device
place	O
the	O
caps	B-Device
lock	I-Device
.	O
</s>
<s>
This	O
is	O
the	O
only	O
control	B-Device
key	I-Device
on	O
the	O
keyboard	B-Device
.	O
</s>
<s>
The	O
esc	B-Device
key	I-Device
is	O
located	O
to	O
the	O
left	O
of	O
the	O
1	O
key	O
;	O
the	O
tilde	O
key	O
normally	O
found	O
there	O
is	O
at	O
the	O
right	O
end	O
of	O
the	O
same	O
row	O
.	O
</s>
<s>
The	O
delete	B-Device
key	I-Device
is	O
located	O
directly	O
above	O
the	O
enter	B-Device
key	I-Device
;	O
the	O
key	O
normally	O
found	O
there	O
is	O
the	O
second-rightmost	O
key	O
on	O
the	O
row	O
above	O
it	O
.	O
</s>
<s>
Further	O
,	O
this	O
is	O
a	O
true	O
delete	B-Device
key	I-Device
,	O
not	O
a	O
historically	O
named	O
backspace	B-Device
.	O
</s>
<s>
The	O
meta	B-Device
keys	I-Device
are	O
located	O
between	O
the	O
space	B-Device
bar	I-Device
and	O
the	O
alt	B-Device
keys	I-Device
.	O
</s>
<s>
On	O
the	O
far	O
side	O
of	O
the	O
keyboard	B-Device
there	O
are	O
DIP	O
switches	O
.	O
</s>
<s>
Turn	O
the	O
delete	B-Device
key	I-Device
into	O
a	O
backspace	B-Device
.	O
</s>
<s>
remains	O
backspace	B-Device
,	O
and	O
(	O
top-right	O
key	O
)	O
remains	O
delete	O
.	O
</s>
<s>
Swap	O
the	O
alt	O
and	O
meta	B-Device
keys	I-Device
.	O
</s>
<s>
Enable/disable	O
downstream	O
USB	B-Protocol
ports	O
on	O
USB	B-Protocol
models	O
.	O
</s>
<s>
Its	O
size	O
is	O
roughly	O
half	O
the	O
size	O
of	O
DIN	B-Application
A4	O
paper	O
.	O
</s>
<s>
Model	O
name	O
Model	O
#	O
Color	O
Switch	O
type	O
Interface	O
Blank	O
keycaps	O
Introduced	O
EOL	O
Notes	O
Happy	B-Device
Hacking	I-Device
Keyboard	I-Device
PD-KB02	O
White	O
Membrane	B-Device
PS/2	B-Protocol
,	O
Sun	O
,	O
ADB	B-Device
rowspan	O
=	O
"	O
17	O
"	O
Dec	O
20	O
,	O
1996	O
Dec	O
10	O
,	O
2006	O
Buzzer	O
(	O
Sun	O
)	O
,	O
Power	O
supply	O
switch	O
(	O
Sun/Mac	O
)	O
PD-KB02N	O
Happy	B-Device
Hacking	I-Device
Keyboard	I-Device
Lite	O
PD-KB100W	O
White	O
PS/2	B-Protocol
Jun	O
7	O
,	O
1999	O
Was	O
also	O
available	O
in	O
black	O
and	O
white	O
unlabeled	O
versions	O
Happy	B-Device
Hacking	I-Device
Keyboard	I-Device
Lite	O
2	O
PD-KB200W/P	O
White	O
Mar	O
15	O
,	O
2001	O
Dec	O
19	O
,	O
2008	O
Arrow	O
keys	O
,	O
2-port	O
USB	B-Protocol
hub	O
.	O
</s>
<s>
PD-KB200B/P	O
Black	O
PD-KB200W/U	O
White	O
USB	B-Protocol
PD-KB200B/U	O
Black	O
PD-KB210W/U	O
White	O
PD-KB210B/U	O
Black	O
PD-KB220W/U	O
White	O
PD-KB220B/U	O
Black	O
PD-KB220MKW	O
White	O
Mac	O
version	O
,	O
has	O
command	O
and	O
option	O
keys	O
in	O
addition	O
to	O
the	O
other	O
Lite	O
2	O
features	O
.	O
</s>
