<s>
The	O
Z22	B-Device
was	O
the	O
seventh	O
computer	O
model	O
Konrad	O
Zuse	O
developed	O
(	O
the	O
first	O
six	O
being	O
the	O
Z1	B-Device
,	O
Z2	B-Device
,	O
Z3	B-Device
,	O
Z4	B-Device
,	O
Z5	B-Device
and	O
Z11	B-Device
,	O
respectively	O
)	O
.	O
</s>
<s>
One	O
of	O
the	O
early	O
commercial	O
computers	O
,	O
the	O
Z22	B-Device
's	O
design	O
was	O
finished	O
about	O
1955	O
.	O
</s>
<s>
The	O
major	O
version	O
jump	O
from	O
Z11	B-Device
to	O
Z22	B-Device
was	O
due	O
to	O
the	O
use	O
of	O
vacuum	O
tubes	O
,	O
as	O
opposed	O
to	O
the	O
electromechanical	O
systems	O
used	O
in	O
earlier	O
models	O
.	O
</s>
<s>
By	O
the	O
end	O
of	O
1958	O
the	O
ZMMD-group	O
had	O
built	O
a	O
working	O
ALGOL	B-Language
58	I-Language
compiler	O
for	O
the	O
Z22	B-Device
computer	O
.	O
</s>
<s>
ZMMD	O
was	O
an	O
abbreviation	O
for	O
Zürich	O
(	O
where	O
Rutishauser	O
worked	O
)	O
,	O
München	O
(	O
workplace	O
of	O
Bauer	O
and	O
Samelson	O
)	O
,	O
Mainz	O
(	O
location	O
of	O
the	O
Z22	B-Device
computer	O
)	O
,	O
Darmstadt	O
(	O
workplace	O
of	O
Bottenbruch	O
)	O
.	O
</s>
<s>
In	O
1961	O
,	O
the	O
Z22	B-Device
was	O
followed	O
by	O
a	O
logically	O
very	O
similar	O
transistorized	O
version	O
,	O
the	O
Z23	B-Device
.	O
</s>
<s>
Already	O
in	O
1954	O
,	O
Zuse	O
had	O
come	O
to	O
an	O
agreement	O
with	O
Heinz	O
Zemanek	O
that	O
his	O
Zuse	O
KG	O
would	O
finance	O
the	O
work	O
of	O
Rudolf	O
Bodo	O
,	O
who	O
helped	O
Zemanek	O
build	O
the	O
early	O
European	O
transistorized	O
computer	O
Mailüfterl	B-Device
,	O
and	O
that	O
after	O
that	O
project	O
Bodo	O
should	O
work	O
for	O
the	O
Zuse	O
KG	O
—	O
there	O
he	O
helped	O
build	O
the	O
transistorized	O
Z23	B-Device
.	O
</s>
<s>
Furthermore	O
,	O
all	O
circuit	O
diagrams	O
of	O
the	O
Z22	B-Device
were	O
supplied	O
to	O
Bodo	O
and	O
Zemanek	O
.	O
</s>
<s>
The	O
University	O
of	O
Applied	O
Sciences	O
,	O
Karlsruhe	B-Algorithm
still	O
has	O
an	O
operational	O
Z22	B-Device
which	O
is	O
on	O
permanent	O
loan	O
at	O
the	O
ZKM	O
in	O
Karlsruhe	B-Algorithm
.	O
</s>
<s>
Altogether	O
55	O
Z22	B-Device
computers	O
were	O
produced	O
.	O
</s>
<s>
In	O
the	O
1970s	O
,	O
clones	O
of	O
the	O
Z22	B-Device
using	O
TTL	O
were	O
built	O
by	O
the	O
company	O
Thiemicke	O
Computer	O
.	O
</s>
<s>
The	O
typical	O
setup	O
of	O
a	O
Z22	B-Device
was	O
:	O
</s>
<s>
The	O
Z22	B-Device
operated	O
at	O
3kHz	O
operating	O
frequency	O
,	O
which	O
was	O
synchronous	O
with	O
the	O
speed	O
of	O
the	O
drum	B-General_Concept
storage	I-General_Concept
.	O
</s>
<s>
The	O
Z22	B-Device
also	O
had	O
glow-lamps	O
which	O
showed	O
the	O
memory	O
state	O
and	O
machine	O
state	O
as	O
output	O
.	O
</s>
<s>
The	O
Z22	B-Device
was	O
designed	O
to	O
be	O
easier	O
to	O
program	O
than	O
previous	O
first	B-Architecture
generation	I-Architecture
computers	I-Architecture
.	O
</s>
