<s>
The	O
ITT	B-Device
2020	I-Device
was	O
an	O
Apple	B-Device
II	I-Device
computer	O
clone	B-General_Concept
manufactured	O
by	O
ITT	O
under	O
license	O
from	O
Apple	O
Computer	O
(	O
the	O
first	O
licensed	O
clone	B-General_Concept
)	O
,	O
specifically	O
for	O
the	O
European	O
market	O
.	O
</s>
<s>
The	O
major	O
difference	O
,	O
and	O
the	O
reason	O
ITT	O
believed	O
this	O
personal	O
computer	O
would	O
be	O
a	O
success	O
,	O
was	O
that	O
the	O
color	O
video	O
signal	O
conformed	O
to	O
the	O
European	O
PAL	B-Language
standard	O
,	O
rather	O
than	O
the	O
American	O
NTSC	O
standard	O
.	O
</s>
<s>
This	O
meant	O
color	O
graphics	O
could	O
be	O
viewed	O
using	O
a	O
standard	O
European	O
monitor	O
or	O
TV	O
set	O
,	O
rather	O
than	O
having	O
to	O
import	O
an	O
NTSC	O
monitor	O
from	O
America	O
or	O
Japan	O
as	O
was	O
the	O
case	O
for	O
the	O
Apple	B-Device
II	I-Device
.	O
</s>
<s>
When	O
Apple	O
Computer	O
started	O
shipping	O
the	O
Apple	B-Device
II	I-Device
Europlus	O
,	O
ITT	O
withdrew	O
from	O
the	O
market	O
,	O
although	O
the	O
Europlus	O
did	O
not	O
support	O
color	O
.	O
</s>
<s>
ITT	O
also	O
supplied	O
a	O
113.75	O
kB	O
single-sided	O
floppy	B-Device
disk	I-Device
drive	I-Device
that	O
was	O
identical	O
to	O
the	O
AppleII	O
disk	O
drive	O
,	O
supporting	O
13	O
sectors	O
under	O
DOS	O
3.2	O
on	O
a	O
floppy	B-Device
disk	I-Device
.	O
</s>
<s>
The	O
ITT	B-Device
2020	I-Device
used	O
a	O
higher	O
clock	O
frequency	O
,	O
necessary	O
for	O
the	O
PAL	B-Language
signal	O
.	O
</s>
<s>
A	O
crystal	O
was	O
used	O
(	O
Four	O
times	O
the	O
PAL	B-Language
subcarrier	O
frequency	O
of	O
)	O
,	O
whereas	O
the	O
Apple	B-Device
II	I-Device
used	O
a	O
crystal	O
-	O
four	O
times	O
the	O
NTSC	O
subcarrier	O
frequency	O
of	O
.	O
</s>
<s>
In	O
the	O
ITT	B-Device
2020	I-Device
,	O
the	O
crystal	O
frequency	O
was	O
divided	O
by	O
17	O
to	O
give	O
the	O
microprocessor	O
a	O
clock	O
frequency	O
of	O
.	O
</s>
<s>
In	O
the	O
Apple	B-Device
II	I-Device
,	O
the	O
frequency	O
was	O
divided	O
by	O
14	O
to	O
give	O
a	O
microprocessor	O
clock	O
frequency	O
of	O
.	O
</s>
<s>
This	O
was	O
done	O
to	O
avoid	O
the	O
many	O
accidental	O
resets	O
earlier	O
(	O
and	O
Apple	B-Device
II	I-Device
)	O
users	O
complained	O
about	O
.	O
</s>
<s>
The	O
bug	O
in	O
the	O
routine	O
in	O
the	O
Apple	B-Device
II	I-Device
that	O
required	O
users	O
to	O
a	O
patch	O
,	O
was	O
resolved	O
in	O
the	O
ITT	B-Device
2020	I-Device
.	O
</s>
<s>
The	O
DOS	O
ITT	O
supplied	O
with	O
the	O
2020	O
was	O
Apple	B-Operating_System
DOS	I-Operating_System
3.2	O
.	O
</s>
<s>
Any	O
Apple	B-Device
II	I-Device
program	O
using	O
graphics	O
had	O
problems	O
on	O
the	O
ITT	B-Device
2020	I-Device
.	O
</s>
<s>
The	O
colors	O
were	O
different	O
to	O
those	O
on	O
the	O
Apple	B-Device
II	I-Device
in	O
both	O
hi-res	O
and	O
lo-res	O
modes	O
.	O
</s>
<s>
Because	O
of	O
the	O
difference	O
in	O
clock	O
frequency	O
,	O
programs	O
on	O
the	O
ITT	B-Device
2020	I-Device
(	O
without	O
graphics	O
)	O
ran	O
2%	O
faster	O
(	O
benchmark	O
tests	O
confirmed	O
this	O
)	O
.	O
</s>
<s>
BSAVE	B-Protocol
and	O
BLOAD	B-Protocol
of	O
graphics	O
images	O
did	O
not	O
work	O
,	O
as	O
the	O
9th	O
bit	O
was	O
not	O
included	O
in	O
the	O
file	O
.	O
</s>
<s>
The	O
most	O
significant	O
difference	O
between	O
the	O
ITT	B-Device
2020	I-Device
and	O
the	O
Apple	B-Device
II	I-Device
is	O
the	O
Hi-res	O
graphics	O
resolution	O
.	O
</s>
<s>
ITT	O
increased	O
the	O
horizontal	O
resolution	O
from	O
the	O
280	O
pixels	O
the	O
Apple	B-Device
II	I-Device
used	O
,	O
to	O
360	O
pixels	O
.	O
</s>
<s>
This	O
made	O
many	O
Apple	B-Device
II	I-Device
programs	O
incompatible	O
with	O
this	O
computer	O
.	O
</s>
<s>
The	O
higher	O
resolution	O
was	O
a	O
necessary	O
consequence	O
of	O
the	O
higher	O
frequency	O
of	O
the	O
PAL	B-Language
color	O
subcarrier	O
.	O
</s>
<s>
In	O
order	O
to	O
provide	O
enough	O
bits	O
to	O
the	O
video	O
shift	O
register	O
to	O
generate	O
the	O
higher	O
PAL	B-Language
subcarrier	O
frequency	O
,	O
9	O
bits	O
per	O
memory	O
location	O
were	O
needed	O
,	O
rather	O
than	O
the	O
7	O
bits	O
the	O
Apple	B-Device
II	I-Device
used	O
.	O
</s>
<s>
The	O
bitmap	O
graphics	O
compatibility	O
with	O
the	O
Apple	B-Device
II	I-Device
could	O
be	O
improved	O
by	O
installing	O
a	O
third	O
party	O
Hires	O
conversion	O
board	O
.	O
</s>
<s>
This	O
significantly	O
improves	O
compatibility	O
with	O
software	O
intended	O
for	O
the	O
original	O
Apple	B-Device
II	I-Device
manipulating	O
graphics	O
memory	O
directly	O
.	O
</s>
<s>
However	O
,	O
even	O
with	O
this	O
board	O
enabled	O
the	O
colors	O
still	O
differ	O
from	O
the	O
original	O
Apple	B-Device
II	I-Device
.	O
</s>
