<s>
Touch	B-Device
Typist	I-Device
Typing	I-Device
Tutor	I-Device
is	O
developed	O
by	O
Sector	O
Software	O
.	O
</s>
<s>
Touch	B-Device
Typist	I-Device
typing	I-Device
tutor	I-Device
is	O
the	O
earliest	O
example	O
of	O
typing	O
tutor	O
software	O
currently	O
still	O
on	O
sale	O
.	O
</s>
<s>
The	O
software	O
was	O
written	O
and	O
released	O
for	O
sale	O
in	O
1985	O
on	O
the	O
Sinclair	B-Device
QL	I-Device
computer	O
.	O
</s>
<s>
The	O
software	O
was	O
also	O
first	O
advertised	O
as	O
a	O
small	O
classified	O
advert	O
in	O
QL	O
World	O
magazine	O
,	O
but	O
soon	O
became	O
a	O
flagship	O
product	O
for	O
the	O
company	O
formed	O
to	O
sell	O
it	O
,	O
Sector	O
Software	O
.	O
</s>
<s>
Touch	B-Device
Typist	I-Device
soon	O
went	O
on	O
sale	O
in	O
WH	O
Smiths	O
as	O
well	O
as	O
in	O
many	O
smaller	O
computer	O
shops	O
which	O
were	O
supplied	O
by	O
the	O
now	O
defunct	O
company	O
Terry	O
Blood	O
Distribution	O
Ltd	O
.	O
</s>
<s>
The	O
software	O
was	O
originally	O
written	O
in	O
QL	O
Basic	O
on	O
the	O
Sinclair	B-Device
QL	I-Device
,	O
this	O
was	O
compiled	O
with	O
the	O
Digital	O
Precision	O
Superbasic	O
Compiler	O
and	O
released	O
on	O
Sinclair	O
Microdrive	O
cartridges	O
for	O
the	O
Sinclair	B-Device
QL	I-Device
computer	O
.	O
</s>
<s>
The	O
software	O
was	O
soon	O
converted	O
to	O
run	O
on	O
other	O
computers	O
including	O
the	O
Atari	B-Device
ST	I-Device
,	O
Commodore	B-Device
Amiga	I-Device
,	O
Acorn	B-Device
Archimedes	I-Device
,	O
Cambridge	O
Computers	O
Z88	O
Portable	B-Device
computer	I-Device
and	O
Microsoft	B-Application
Windows	I-Application
based	O
computers	O
.	O
</s>
<s>
Touch	B-Device
Typist	I-Device
has	O
been	O
on	O
continuous	O
sale	O
and	O
been	O
continually	O
developed	O
by	O
the	O
original	O
author	O
David	O
Batty	O
and	O
is	O
still	O
published	O
by	O
the	O
original	O
company	O
,	O
Sector	O
Software	O
of	O
Leyland	O
Lancashire	O
.	O
</s>
<s>
The	O
current	O
version	O
of	O
the	O
software	O
is	O
written	O
in	O
Microsoft	B-Language
Visual	I-Language
Basic	I-Language
,	O
versions	O
for	O
other	O
platforms	O
have	O
all	O
been	O
written	O
in	O
other	O
versions	O
of	O
compiled	O
BASIC	O
.	O
</s>
<s>
The	O
first	O
version	O
of	O
the	O
software	O
had	O
a	O
Space	B-Application
Invaders	I-Application
game	O
built	O
into	O
it	O
that	O
the	O
users	O
were	O
allowed	O
to	O
play	O
once	O
for	O
every	O
20	O
lessons	O
they	O
completed	O
.	O
</s>
<s>
The	O
Sinclair	B-Device
QL	I-Device
had	O
128KB	O
of	O
memory	O
,	O
but	O
after	O
the	O
operating	B-General_Concept
system	I-General_Concept
had	O
taken	O
its	O
share	O
of	O
it	O
,	O
only	O
97KB	O
were	O
left	O
for	O
programs	O
to	O
run	O
.	O
</s>
<s>
Touch	B-Device
Typist	I-Device
was	O
95K	O
in	O
size	O
so	O
there	O
was	O
only	O
2KB	O
of	O
memory	O
left	O
in	O
which	O
to	O
add	O
a	O
game	O
.	O
</s>
<s>
In	O
order	O
to	O
include	O
a	O
game	O
without	O
losing	O
anything	O
from	O
the	O
software	O
,	O
a	O
space	B-Application
invaders	I-Application
game	O
was	O
written	O
in	O
MC68000	B-Device
machine	B-Language
code	I-Language
,	O
the	O
whole	O
game	O
and	O
graphics	O
took	O
just	O
2K	O
of	O
memory	O
.	O
</s>
