<s>
The	O
CST	B-Device
Thor	I-Device
series	O
of	O
personal	B-Device
computers	I-Device
are	O
Sinclair	O
QL-compatible	O
systems	O
designed	O
and	O
produced	O
by	O
Cambridge	O
Systems	O
Technology	O
during	O
the	O
late	O
1980s	O
.	O
</s>
<s>
The	O
original	O
Thor	O
PC	O
(	O
also	O
called	O
Thor	O
1	O
,	O
sometimes	O
also	O
retrospectively	O
referred	O
to	O
as	O
the	O
Thor	O
8	O
)	O
,	O
was	O
launched	O
in	O
1986	O
,	O
as	O
a	O
logical	O
progression	O
of	O
CST	O
's	O
QL	O
peripheral	O
business	O
after	O
production	O
of	O
the	O
Sinclair	B-Device
QL	I-Device
was	O
halted	O
.	O
</s>
<s>
The	O
remaining	O
stock	O
of	O
QL	O
parts	O
were	O
purchased	O
from	O
Sinclair	O
,	O
and	O
the	O
standard	O
QL	O
motherboard	B-Device
(	O
including	O
a	O
7.5MHz	O
Motorola	B-Device
68008	I-Device
CPU	O
and	O
128	O
KiB	O
of	O
RAM	B-Architecture
)	O
was	O
augmented	O
with	O
a	O
CST-designed	O
expansion	O
board	O
providing	O
512	O
KiB	O
of	O
additional	O
RAM	B-Architecture
,	O
extra	O
ROMs	O
,	O
a	O
non-volatile	O
real-time	O
clock	O
,	O
floppy	B-Device
disk	I-Device
,	O
SCSI	B-Architecture
,	O
Centronics	O
parallel	O
,	O
IBM	B-Operating_System
PC/AT	I-Operating_System
-style	O
keyboard	O
and	O
mouse	B-Device
interfaces	O
enclosed	O
in	O
a	O
low-profile	O
metal	O
desktop	O
case	O
with	O
a	O
built-in	O
power	O
supply	O
.	O
</s>
<s>
Mass	O
storage	O
options	O
consisted	O
of	O
one	O
(	O
Thor	O
1F	O
)	O
or	O
two	O
(	O
Thor	O
2F	O
)	O
3.5-inch	O
floppy	B-Device
drives	I-Device
or	O
one	O
floppy	B-Device
drive	I-Device
and	O
one	O
20	O
MB	O
Rodime	O
RO652	O
SCSI	B-Architecture
hard	B-Device
disk	I-Device
(	O
Thor	O
2WF	O
)	O
.	O
</s>
<s>
The	O
ROMs	O
contained	O
Eidersoft	O
's	O
ICE	O
GUI	B-Application
and	O
some	O
QDOS	B-Operating_System
extensions	O
.	O
</s>
<s>
Also	O
,	O
supplied	O
with	O
the	O
Thor	O
was	O
a	O
specially-commissioned	O
version	O
of	O
the	O
Psion	B-Application
Xchange	O
application	O
software	O
suite	O
(	O
an	O
enhanced	O
edition	O
of	O
the	O
Psion	B-Application
applications	O
bundled	O
with	O
the	O
QL	O
)	O
.	O
</s>
<s>
Prices	O
for	O
the	O
Thor	O
PC	O
ranged	O
from	O
£599	O
to	O
£1399	O
,	O
excluding	O
monitor	O
,	O
mouse	B-Device
and	O
VAT	O
.	O
</s>
<s>
The	O
Thor	O
20	O
and	O
Thor	O
21	O
are	O
variants	O
of	O
the	O
Thor	O
PC	O
,	O
launched	O
in	O
April	O
1987	O
and	O
fitted	O
with	O
a	O
68020	B-Device
processor	O
on	O
a	O
daughterboard	O
in	O
place	O
of	O
the	O
original	O
CPU	O
.	O
</s>
<s>
The	O
Thor	O
21	O
is	O
also	O
fitted	O
with	O
the	O
68881	B-General_Concept
floating-point	B-Algorithm
co-processor	O
,	O
running	O
at	O
the	O
same	O
speed	O
as	O
the	O
CPU	O
.	O
</s>
<s>
The	O
Thor	O
20	O
and	O
21	O
were	O
shipped	O
with	O
a	O
68020	B-Device
macro	O
assembler	O
and	O
linker	O
,	O
plus	O
Motorola	O
processor	O
documentation	O
.	O
</s>
<s>
They	O
were	O
intended	O
as	O
a	O
vehicle	O
for	O
the	O
development	O
of	O
software	O
for	O
a	O
projected	O
enhanced	O
68020-based	O
model	O
,	O
later	O
shelved	O
.	O
</s>
<s>
The	O
Thor	O
XVI	O
was	O
developed	O
in	O
collaboration	O
with	O
the	O
Danish	O
company	O
DanSoft	O
and	O
was	O
announced	O
at	O
the	O
Personal	B-Device
Computer	I-Device
World	O
Show	O
in	O
September	O
1987	O
.	O
</s>
<s>
Unlike	O
the	O
previous	O
models	O
,	O
the	O
Thor	O
XVI	O
's	O
hardware	O
is	O
of	O
a	O
completely	O
new	O
design	O
,	O
based	O
around	O
an	O
8MHz	O
68000	B-Device
processor	O
plus	O
a	O
2MHz	O
68B02	B-Device
co-processor	O
for	O
audio	O
and	O
I/O	O
processing	O
.	O
</s>
<s>
512	O
KiB	O
of	O
RAM	B-Architecture
is	O
included	O
as	O
standard	O
(	O
expandable	O
to	O
2	O
MiB	O
,	O
later	O
6.5	O
MiB	O
)	O
.	O
</s>
<s>
Floppy	B-Device
disk	I-Device
,	O
SCSI	B-Architecture
,	O
Centronics	O
,	O
dual	O
S5/8	O
serial	B-Protocol
ports	I-Protocol
,	O
PC/AT	B-Operating_System
keyboard	O
,	O
mouse	B-Device
,	O
QL	O
expansion	O
bus	O
and	O
QLAN	O
network	B-Protocol
interfaces	I-Protocol
are	O
provided	O
.	O
</s>
<s>
Mass	O
storage	O
options	O
are	O
similar	O
to	O
the	O
previous	O
Thors	O
,	O
plus	O
40	O
MB	O
hard	B-Device
disk	I-Device
and	O
diskless	B-Device
network	I-Device
workstation	I-Device
configurations	O
.	O
</s>
<s>
The	O
Thor	O
XVI	O
includes	O
in	O
ROM	B-Device
a	O
QDOS-compatible	O
operating	B-General_Concept
system	I-General_Concept
derived	O
from	O
QDOS	B-Operating_System
1.13	O
,	O
called	O
Argos	O
.	O
</s>
