<s>
The	O
BCL	B-Device
Molecular	I-Device
18	O
was	O
a	O
range	O
of	O
18-bit	B-General_Concept
computers	O
designed	O
and	O
manufactured	O
in	O
the	O
UK	O
from	O
1970	O
until	O
the	O
late	O
1980s.The	O
machines	O
were	O
originally	O
manufactured	O
by	O
Systemation	O
Limited	O
and	O
sold	O
by	O
Business	O
Mechanisation	O
Limited	O
.	O
</s>
<s>
The	O
NOVA	O
was	O
a	O
16	O
bit	O
design	O
but	O
the	O
Molecular	O
was	O
18	B-General_Concept
bit	I-General_Concept
allowing	O
signed	O
arithmetic	O
and	O
a	O
memory	O
parity	O
check	O
bit	O
.	O
</s>
<s>
Introduced	O
the	O
DD1600	O
CDC	O
9427	O
top-loading	O
disk	B-Device
drive	I-Device
one	O
fixed	O
one	O
removable	O
and/or	O
a	O
large	O
multi-platter	O
CDC	O
removable	O
disk	B-Device
drive	I-Device
.	O
</s>
<s>
Programming	O
still	O
done	O
in	O
octal	O
notation	O
machine	O
code	O
in	O
longhand	O
using	O
coding	O
sheets.Core	O
Memory	O
or	O
static	O
RAM	O
,	O
Introduced	O
the	O
CDC	O
Hawk	O
9427H	O
disk	B-Device
drive	I-Device
,	O
up	O
to	O
4	O
supported	O
per	O
controller	O
,	O
max	O
2	O
controllers	O
and/or	O
a	O
large	O
multi-platter	O
CDC	O
D8000	O
removable	O
disk	B-Device
drive	I-Device
.	O
</s>
<s>
Later	O
Bank	O
switching	O
memory	O
introduced	O
(	O
32K	O
18	B-General_Concept
bit	I-General_Concept
words	O
base	O
memory	O
plus	O
up	O
to	O
8	O
X	O
32K	O
banks	O
)	O
.	O
</s>
<s>
First	O
sold	O
with	O
CDC	O
Hawk	O
9427H	O
drives	O
later	O
CDC	O
Lark	O
2	O
disk	B-Device
drives	I-Device
.	O
</s>
<s>
32K	O
18	B-General_Concept
bit	I-General_Concept
words	O
of	O
base	O
memory	O
plus	O
up	O
to	O
8	O
32K	O
banks	O
.	O
</s>
<s>
32K	O
18	B-General_Concept
bit	I-General_Concept
words	O
of	O
base	O
memory	O
plus	O
up	O
to	O
8	O
32K	O
banks	O
.	O
</s>
