<s>
The	O
DISER	O
Lilith	B-Device
is	O
a	O
custom	O
built	O
workstation	B-Device
computer	I-Device
based	O
on	O
the	O
Advanced	O
Micro	O
Devices	O
(	O
AMD	O
)	O
2901	B-General_Concept
bit	B-General_Concept
slicing	I-General_Concept
processor	O
,	O
created	O
by	O
a	O
group	O
led	O
by	O
Niklaus	O
Wirth	O
at	O
ETH	O
Zürich	O
.	O
</s>
<s>
The	O
project	O
began	O
in	O
1977	O
,	O
and	O
by	O
1984	O
several	O
hundred	O
workstations	B-Device
were	O
in	O
use	O
.	O
</s>
<s>
It	O
has	O
a	O
high	O
resolution	O
full	O
page	O
portrait	O
oriented	O
cathode	B-Device
ray	I-Device
tube	I-Device
display	I-Device
,	O
a	O
mouse	B-Device
,	O
a	O
laser	O
printer	O
interface	O
,	O
and	O
a	O
computer	B-Architecture
networking	I-Architecture
interface	O
.	O
</s>
<s>
Its	O
software	O
is	O
written	O
fully	O
in	O
Modula-2	B-Language
and	O
includes	O
a	O
relational	B-Application
database	I-Application
program	O
named	O
Lidas	B-Device
.	O
</s>
<s>
The	O
Lilith	B-Device
processor	O
architecture	O
is	O
a	O
stack	B-Application
machine	I-Application
.	O
</s>
<s>
Citing	O
from	O
Sven	O
Erik	O
Knudsen	O
's	O
contribution	O
to	O
"	O
The	O
Art	O
of	O
Simplicity	O
"	O
:	O
"	O
Lilith	B-Device
's	O
clock	O
speed	O
was	O
around	O
7	O
MHz	O
and	O
enabled	O
Lilith	B-Device
to	O
execute	O
between	O
1	O
and	O
2	O
million	O
instructions	O
(	O
called	O
M-code	O
)	O
per	O
second	O
.	O
</s>
<s>
(	O
...	O
)	O
Initially	O
,	O
the	O
main	O
memory	O
was	O
planned	O
to	O
have	O
65,536	O
16-bit	B-Device
words	O
memory	O
,	O
but	O
soon	O
after	O
its	O
first	O
version	O
,	O
it	O
was	O
enlarged	O
to	O
twice	O
that	O
capacity	O
.	O
</s>
<s>
For	O
regular	O
Modula-2	B-Language
programs	O
however	O
,	O
only	O
the	O
initial	O
65,536	O
words	O
were	O
usable	O
for	O
storage	O
of	O
variables.	O
"	O
</s>
<s>
The	O
development	O
of	O
Lilith	B-Device
was	O
influenced	O
by	O
the	O
Xerox	B-Device
Alto	I-Device
from	O
the	O
Xerox	O
PARC	O
(	O
1973	O
)	O
where	O
Niklaus	O
Wirth	O
spent	O
a	O
sabbatical	O
from	O
1976	O
to	O
1977	O
.	O
</s>
<s>
Unable	O
to	O
bring	O
back	O
one	O
of	O
the	O
Alto	B-Device
systems	O
to	O
Europe	O
,	O
Wirth	O
decided	O
to	O
build	O
a	O
new	O
system	O
from	O
scratch	O
between	O
1978	O
and	O
1980	O
,	O
selling	O
it	O
under	O
the	O
company	O
name	O
DISER	O
(	O
Data	O
Image	O
Sound	O
Processor	O
and	O
Emitter	O
Receiver	O
System	O
)	O
.	O
</s>
<s>
In	O
1985	O
,	O
he	O
had	O
a	O
second	O
sabbatical	O
leave	O
to	O
PARC	O
,	O
which	O
led	O
to	O
the	O
design	O
of	O
the	O
Oberon	B-Application
System	I-Application
.	O
</s>
<s>
Ceres	B-Device
,	O
the	O
follow-up	O
to	O
Lilith	B-Device
,	O
was	O
released	O
in	O
1987	O
.	O
</s>
<s>
The	O
Lilith	B-Device
operating	B-General_Concept
system	I-General_Concept
(	O
OS	O
)	O
,	O
named	O
Medos-2	O
,	O
was	O
developed	O
at	O
ETH	O
Zurich	O
,	O
by	O
Svend	O
Erik	O
Knudsen	O
with	O
advice	O
from	O
Wirth	O
.	O
</s>
<s>
It	O
is	O
a	O
single	O
user	O
,	O
object-oriented	B-Application
operating	I-Application
system	I-Application
built	O
from	O
modules	B-Architecture
of	O
Modula-2	B-Language
.	O
</s>
<s>
Its	O
design	O
influenced	O
design	O
of	O
the	O
OS	O
Excelsior	O
,	O
developed	O
for	O
the	O
Soviet	O
Kronos	B-Device
workstation	B-Device
(	O
see	O
below	O
)	O
,	O
by	O
the	O
Kronos	B-Device
Research	O
Group	O
(	O
KRG	O
)	O
.	O
</s>
<s>
From	O
1986	O
into	O
the	O
early	O
1990s	O
,	O
Soviet	O
Union	O
technologists	O
created	O
and	O
produced	O
a	O
line	O
of	O
printed	O
circuit	O
board	O
systems	O
,	O
and	O
workstations	B-Device
based	O
on	O
them	O
,	O
all	O
named	O
Kronos	B-Device
.	O
</s>
<s>
The	O
workstations	B-Device
were	O
based	O
on	O
Lilith	B-Device
,	O
and	O
made	O
in	O
small	O
numbers	O
.	O
</s>
<s>
The	O
computer	B-Device
mouse	I-Device
of	O
the	O
Lilith	B-Device
was	O
custom-designed	O
,	O
and	O
later	O
used	O
with	O
the	O
Smaky	B-Device
computers	O
.	O
</s>
