<s>
The	O
Tandy	B-Device
2000	I-Device
is	O
a	O
personal	B-Device
computer	I-Device
introduced	O
by	O
Radio	O
Shack	O
in	O
September	O
1983	O
based	O
on	O
the	O
8MHz	O
Intel	B-Device
80186	I-Device
microprocessor	B-Architecture
running	O
MS-DOS	B-Application
.	O
</s>
<s>
By	O
comparison	O
,	O
the	O
IBM	B-Device
PC	I-Device
XT	I-Device
(	O
introduced	O
in	O
March	O
1983	O
)	O
used	O
the	O
older	O
4.77MHz	O
Intel	B-Device
8088	I-Device
processor	O
,	O
and	O
the	O
IBM	B-Operating_System
PC/AT	I-Operating_System
(	O
introduced	O
in	O
1984	O
)	O
would	O
later	O
use	O
the	O
newer	O
6MHz	O
Intel	B-General_Concept
80286	I-General_Concept
.	O
</s>
<s>
Due	O
to	O
the	O
16-bit-wide	O
data	O
bus	O
and	O
more	O
efficient	O
instruction	O
decoding	O
of	O
the	O
80186	B-Device
,	O
the	O
Tandy	B-Device
2000	I-Device
ran	O
significantly	O
faster	O
than	O
other	O
PC	O
compatibles	O
,	O
and	O
slightly	O
faster	O
than	O
the	O
PC	B-Operating_System
AT	I-Operating_System
.	O
</s>
<s>
(	O
Later	O
IBM	O
upgraded	O
the	O
80286	B-General_Concept
in	O
new	O
PC	B-Operating_System
AT	I-Operating_System
models	O
to	O
8MHz	O
,	O
though	O
with	O
wait	B-Device
states	I-Device
.	O
)	O
</s>
<s>
The	O
Tandy	B-Device
2000	I-Device
was	O
the	O
company	O
's	O
first	O
computer	O
built	O
around	O
an	O
Intel	O
x86	O
series	O
microprocessor	B-Architecture
;	O
previous	O
models	O
used	O
the	O
Zilog	B-General_Concept
Z80	I-General_Concept
and	O
Motorola	B-Device
6809	I-Device
CPUs	O
.	O
</s>
<s>
While	O
touted	O
as	O
being	O
compatible	O
with	O
the	O
IBM	B-Device
XT	I-Device
,	O
the	O
Tandy	B-Device
2000	I-Device
was	O
different	O
enough	O
that	O
most	O
existing	O
PC	O
software	O
that	O
was	O
not	O
purely	O
text-oriented	O
failed	O
to	O
work	O
properly	O
.	O
</s>
<s>
The	O
Tandy	B-Device
2000	I-Device
and	O
its	O
special	O
version	O
of	O
MS-DOS	B-Application
supported	O
up	O
to	O
768	O
KB	O
of	O
RAM	O
,	O
significantly	O
more	O
than	O
the	O
640	O
KB	O
limit	O
imposed	O
by	O
the	O
IBM	O
architecture	O
.	O
</s>
<s>
It	O
used	O
80-track	O
double-sided	O
quad-density	O
floppy	O
drives	O
of	O
720	O
KB	O
capacity	O
;	O
the	O
IBM	O
standard	O
at	O
the	O
time	O
of	O
the	O
introduction	O
of	O
the	O
Tandy	B-Device
2000	I-Device
was	O
only	O
360	O
KB	O
.	O
</s>
<s>
The	O
Tandy	B-Device
2000	I-Device
had	O
both	O
"	O
Tandy	O
"	O
and	O
"	O
TRS-80	B-Device
"	O
logos	O
on	O
its	O
case	O
,	O
marking	O
the	O
start	O
of	O
the	O
phaseout	O
of	O
the	O
"	O
TRS-80	B-Device
"	O
brand	O
.	O
</s>
<s>
The	O
introduction	O
of	O
IBM	O
's	O
Model	O
5150	O
Personal	B-Device
Computer	I-Device
in	O
August	O
1981	O
created	O
an	O
entirely	O
new	O
market	O
for	O
microcomputers	O
.	O
</s>
<s>
By	O
this	O
date	O
Tandy/Radio	O
Shack	O
had	O
been	O
in	O
the	O
small-computer	O
market	O
for	O
four	O
years	O
,	O
since	O
its	O
August	O
1977	O
introduction	O
of	O
the	O
TRS-80	B-Device
Model	I-Device
I	I-Device
.	O
</s>
<s>
The	O
new	O
computer	O
division	O
followed	O
in	O
October	O
1979	O
with	O
the	O
TRS-80	B-Device
Model	I-Device
II	I-Device
—	O
a	O
high-end	O
business-oriented	O
system	O
.	O
</s>
<s>
In	O
1983	O
the	O
TRS-80	B-Device
Model	I-Device
4	I-Device
succeeded	O
the	O
Model	O
III	O
(	O
which	O
itself	O
had	O
replaced	O
the	O
Model	O
I	O
)	O
in	O
the	O
consumer	O
and	O
educational	O
markets	O
.	O
</s>
<s>
In	O
the	O
business	O
segment	O
the	O
TRS-80	B-Device
Model	O
12	O
and	O
Model	O
16	O
succeeded	O
the	O
Model	O
II	O
,	O
adding	O
higher-end	O
features	O
.	O
</s>
<s>
Until	O
the	O
IBM	B-Device
PC	I-Device
was	O
introduced	O
the	O
nearest	O
thing	O
to	O
an	O
industry	O
standard	O
in	O
small	O
computers	O
was	O
CP/M	O
-80	O
;	O
no	O
single	O
manufacturer	O
dominated	O
.	O
</s>
<s>
By	O
1983	O
the	O
IBM	B-Device
PC	I-Device
,	O
and	O
Tandy	O
's	O
discouraging	O
of	O
third-party	O
products	O
,	O
had	O
halved	O
the	O
company	O
's	O
market	O
share	O
and	O
stopped	O
profit	O
growth	O
.	O
</s>
<s>
Tandy	O
's	O
motive	O
for	O
moving	O
into	O
the	O
new	O
MS-DOS	B-Application
domain	O
was	O
twofold	O
:	O
to	O
capitalize	O
on	O
the	O
new	O
market	O
and	O
to	O
leverage	O
sales	O
opportunities	O
afforded	O
by	O
their	O
solid	O
position	O
in	O
small	O
computers	O
.	O
</s>
<s>
Marketing	O
management	O
believed	O
that	O
many	O
Tandy	O
customers	O
would	O
prefer	O
to	O
stay	O
with	O
Tandy	O
products	O
when	O
(	O
inevitably	O
,	O
it	O
seemed	O
)	O
they	O
made	O
the	O
jump	O
onto	O
the	O
burgeoning	O
IBM/Microsoft	O
bandwagon	O
;	O
it	O
was	O
figured	O
that	O
the	O
company	O
was	O
well-positioned	O
in	O
this	O
regard	O
because	O
of	O
its	O
large	O
base	O
of	O
customers	O
in	O
both	O
the	O
consumer	O
and	O
business	O
markets	O
(	O
with	O
its	O
Z80-based	O
TRS-80	B-Device
Models	O
I/III/4	O
and	O
68000-based	O
Models	O
12	O
and	O
16	O
,	O
respectively	O
)	O
.	O
</s>
<s>
Thus	O
the	O
company	O
would	O
become	O
the	O
market	O
leader	O
offering	O
the	O
hottest	O
new	O
trend	O
—	O
affordable	O
16-bit	O
computers	O
running	O
MS-DOS	B-Application
—	O
directly	O
to	O
the	O
computing	O
public	O
.	O
</s>
<s>
Therefore	O
,	O
Tandy	O
would	O
have	O
to	O
produce	O
an	O
IBM-style	O
computer	O
running	O
the	O
now	O
industry-standard	O
MS-DOS	B-Application
.	O
</s>
<s>
Most	O
other	O
big-name	O
computer	O
manufacturers	O
made	O
the	O
same	O
leap	O
into	O
the	O
PC/MS	O
-DOS	O
market	O
:	O
</s>
<s>
Shortly	O
after	O
IBM	O
's	O
introduction	O
of	O
its	O
286-based	O
PC/AT	B-Operating_System
,	O
one	O
reviewer	O
remarked	O
,	O
"	O
The	O
bottom	O
line	O
is	O
that	O
the	O
Tandy	B-Device
2000	I-Device
is	O
still	O
one	O
of	O
the	O
hottest	O
single-user	O
machines	O
on	O
the	O
market	O
,	O
and	O
a	O
full	O
year	O
after	O
its	O
introduction	O
,	O
its	O
superiority	O
remains	O
unchallenged.	O
"	O
</s>
<s>
Applications	O
software	O
compatible	O
with	O
the	O
MS-DOS	B-Application
operating	O
system	O
would	O
run	O
properly	O
on	O
the	O
Tandy	B-Device
2000	I-Device
.	O
</s>
<s>
This	O
means	O
that	O
the	O
software	O
had	O
to	O
access	O
the	O
computer	O
's	O
hardware	O
(	O
particularly	O
the	O
video	O
display	O
)	O
strictly	O
through	O
calls	O
to	O
the	O
operating	O
system	O
's	O
BIOS	B-Operating_System
.	O
</s>
<s>
However	O
,	O
programs	O
written	O
to	O
run	O
under	O
the	O
similar	O
PC	B-Operating_System
DOS	I-Operating_System
operating	O
system	O
on	O
an	O
actual	O
IBM	B-Device
PC	I-Device
computer	O
often	O
bypassed	O
calls	O
to	O
the	O
operating	O
system	O
because	O
the	O
IBM	B-Operating_System
BIOS	I-Operating_System
was	O
poorly	O
designed	O
and	O
implemented	O
.	O
</s>
<s>
To	O
function	O
with	O
adequate	O
speed	O
of	O
execution	O
,	O
and	O
to	O
perform	O
operations	O
not	O
provided	O
for	O
by	O
the	O
IBM	B-Operating_System
BIOS	I-Operating_System
,	O
applications	O
programmers	O
often	O
coded	O
their	O
programs	O
to	O
directly	O
address	O
the	O
hardware	O
of	O
the	O
IBM	B-Device
PC	I-Device
.	O
</s>
<s>
Therefore	O
any	O
computer	O
such	O
as	O
the	O
Tandy	B-Device
2000	I-Device
that	O
had	O
hardware	O
that	O
differed	O
in	O
its	O
details	O
from	O
an	O
IBM	B-Device
PC	I-Device
would	O
not	O
execute	O
programs	O
the	O
same	O
way	O
,	O
which	O
most	O
often	O
manifested	O
incorrect	O
results	O
by	O
those	O
programs	O
.	O
</s>
<s>
Its	O
strategy	O
of	O
offering	O
a	O
high-performance	O
PC	O
was	O
the	O
origin	O
of	O
the	O
Tandy	B-Device
2000	I-Device
's	O
technical	O
specifications	O
.	O
</s>
<s>
Some	O
of	O
the	O
rival	O
computers	O
improved	O
the	O
PC	O
hardware	O
and	O
matched	O
the	O
Tandy	B-Device
2000	I-Device
in	O
one	O
or	O
two	O
dimensions	O
,	O
but	O
none	O
offered	O
across-the-board	O
enhancement	O
.	O
</s>
<s>
Except	O
as	O
noted	O
,	O
they	O
ran	O
MS-DOS	B-Application
but	O
were	O
incompatible	O
with	O
the	O
IBM	B-Operating_System
PC	I-Operating_System
at	I-Operating_System
the	O
hardware	O
level	O
.	O
</s>
<s>
More	O
expansion	O
"	O
than	O
the	O
IBM	B-Device
PC	I-Device
or	O
"	O
other	O
MS-DOS	B-Application
computers	O
"	O
.	O
</s>
<s>
While	O
admitting	O
in	O
1984	O
that	O
many	O
MS-DOS	B-Application
programs	O
did	O
not	O
support	O
the	O
computer	O
,	O
the	O
company	O
stated	O
that	O
"	O
the	O
most	O
popular	O
,	O
sophisticated	O
software	O
on	O
the	O
market	O
"	O
was	O
available	O
,	O
either	O
immediately	O
or	O
"	O
over	O
the	O
next	O
six	O
months	O
"	O
.	O
</s>
<s>
Two	O
models	O
of	O
Tandy	B-Device
2000	I-Device
were	O
introduced	O
:	O
a	O
dual-drive	O
floppy-only	O
model	O
for	O
and	O
the	O
2000HD	O
with	O
a	O
single	O
floppy	O
drive	O
and	O
a	O
half-height	O
10	O
MB	O
hard	O
drive	O
for	O
.	O
</s>
<s>
For	O
comparison	O
,	O
at	O
this	O
time	O
the	O
low-end	O
TRS-80	B-Device
Model	I-Device
4	I-Device
with	O
two	O
floppy	O
drives	O
cost	O
and	O
the	O
high-end	O
Model	O
16	O
with	O
two	O
floppy	O
drives	O
cost	O
.	O
</s>
<s>
The	O
Tandy	B-Device
2000	I-Device
received	O
a	O
lukewarm	O
welcome	O
by	O
the	O
market	O
and	O
the	O
computer	O
press	O
because	O
of	O
its	O
inability	O
to	O
run	O
most	O
popular	O
MS-DOS	B-Application
applications	O
.	O
</s>
<s>
This	O
is	O
also	O
why	O
so	O
many	O
of	O
the	O
other	O
PC-style	O
computers	O
by	O
other	O
manufacturers	O
were	O
not	O
hardware-compatible	O
with	O
the	O
IBM	B-Device
PC	I-Device
.	O
</s>
<s>
Though	O
the	O
company	O
supported	O
the	O
machine	O
with	O
hardware	O
add-ons	O
and	O
software	O
tailored	O
specially	O
for	O
it	O
(	O
including	O
bestsellers	O
like	O
Lotus	B-Application
1-2-3	I-Application
Release	O
1A	O
and	O
AutoCAD	B-Algorithm
)	O
,	O
the	O
computer	O
failed	O
to	O
gain	O
popular	O
acceptance	O
and	O
was	O
never	O
developed	O
further	O
.	O
</s>
<s>
It	O
would	O
not	O
be	O
until	O
late	O
1986	O
,	O
with	O
the	O
introduction	O
of	O
the	O
Tandy	B-Device
3000	I-Device
,	O
that	O
Tandy	O
offered	O
a	O
PC-style	O
computer	O
with	O
performance	O
comparable	O
with	O
the	O
Tandy	B-Device
2000	I-Device
.	O
</s>
<s>
The	O
Tandy	B-Device
2000	I-Device
was	O
marketed	O
through	O
early	O
1988	O
with	O
continual	O
price	O
cuts	O
.	O
</s>
<s>
Eventually	O
they	O
were	O
closed	O
out	O
for	O
$999	O
and	O
the	O
remaining	O
unsold	O
computers	O
were	O
converted	O
into	O
Radio	O
Shack	O
store	O
operations	O
terminals	O
(	O
which	O
,	O
coincidentally	O
,	O
had	O
been	O
one	O
of	O
the	O
backup	O
plans	O
for	O
the	O
original	O
TRS-80	B-Device
Model	I-Device
I	I-Device
)	O
.	O
</s>
<s>
The	O
Tandy	B-Device
2000	I-Device
was	O
nominally	O
BIOS-compatible	O
with	O
the	O
IBM	B-Device
XT	I-Device
,	O
which	O
allowed	O
well-behaved	O
DOS	O
software	O
to	O
run	O
on	O
both	O
platforms	O
.	O
</s>
<s>
However	O
,	O
most	O
DOS	O
software	O
of	O
the	O
time	O
bypassed	O
the	O
operating	O
system	O
and	O
BIOS	B-Operating_System
and	O
directly	O
accessed	O
the	O
hardware	O
(	O
especially	O
video	O
and	O
external	O
ports	O
)	O
to	O
achieve	O
higher	O
performance	O
,	O
rendering	O
such	O
software	O
incompatible	O
with	O
the	O
Tandy	B-Device
2000	I-Device
.	O
</s>
<s>
The	O
base-model	O
Tandy	B-Device
2000	I-Device
supported	O
only	O
a	O
text-mode	O
display	O
in	O
monochrome	O
.	O
</s>
<s>
The	O
text-mode	O
address	O
space	O
was	O
in	O
a	O
different	O
location	O
but	O
third-party	O
memory-resident	O
software	O
hacks	O
remedied	O
this	O
by	O
copying	O
the	O
PC-compatible	O
text-mode	O
memory	O
to	O
the	O
Tandy	B-Device
2000	I-Device
's	O
text	O
space	O
at	O
a	O
rate	O
of	O
5	O
–	O
10	O
times	O
per	O
second	O
.	O
</s>
<s>
The	O
display	O
was	O
upgradable	O
to	O
support	O
pixel-addressable	O
graphics	O
via	O
the	O
Tandy	B-Device
2000	I-Device
Graphics	O
Adapter	O
,	O
a	O
circuit	O
board	O
that	O
fit	O
into	O
an	O
expansion	O
slot	O
.	O
</s>
<s>
There	O
were	O
only	O
three	O
non-Tandy	O
monitors	O
that	O
worked	O
with	O
the	O
Tandy	B-Device
2000	I-Device
graphics	O
card	O
,	O
all	O
of	O
which	O
are	O
long	O
out	O
of	O
production	O
.	O
</s>
<s>
The	O
required	O
horizontal	O
scan	O
frequency	O
for	O
the	O
Tandy	B-Device
2000	I-Device
is	O
26.4kHz	O
.	O
</s>
<s>
The	O
Tandy	B-Device
2000	I-Device
used	O
quad-density	O
5.25	O
"	O
floppy	O
disks	O
formatted	O
at	O
720k	O
.	O
</s>
<s>
Normal	O
PCs	B-Device
of	O
the	O
time	O
had	O
40-track	O
double-density	O
floppy	O
drives	O
and	O
could	O
not	O
read	O
quad-density	O
due	O
to	O
the	O
drive	O
heads	O
being	O
too	O
wide	O
to	O
read	O
the	O
narrower	O
tracks	O
.	O
</s>
<s>
1.2MB	O
5.25	O
"	O
drives	O
(	O
introduced	O
on	O
the	O
IBM	B-Operating_System
AT	I-Operating_System
)	O
could	O
read	O
quad-density	O
disks	O
as	O
they	O
were	O
80-track	O
and	O
had	O
thinner	O
heads	O
.	O
</s>
<s>
Various	O
utility	O
programs	O
for	O
DOS	O
existed	O
that	O
allowed	O
nonstandard	O
formats	O
,	O
such	O
as	O
the	O
Tandy	B-Device
2000	I-Device
's	O
disks	O
,	O
to	O
be	O
read	O
.	O
</s>
<s>
Much	O
like	O
1.2MB	O
drives	O
,	O
the	O
Tandy	B-Device
2000	I-Device
had	O
problems	O
reliably	O
writing	O
360k	O
PC	O
disks	O
due	O
to	O
the	O
smaller	O
heads	O
not	O
completely	O
erasing	O
the	O
tracks	O
and	O
causing	O
40-track	O
drives	O
to	O
become	O
confused	O
by	O
residual	O
magnetic	O
signals	O
on	O
the	O
outer	O
edge	O
of	O
the	O
track	O
.	O
</s>
<s>
Tandy	O
distributed	O
the	O
computer	O
with	O
a	O
utility	O
called	O
PC-Maker	O
that	O
would	O
read	O
and	O
format	O
40-track	O
disks	O
in	O
the	O
2000s	O
80-track	O
drives	O
,	O
and	O
were	O
readable	O
in	O
drives	O
on	O
ordinary	O
PCs	B-Device
.	O
</s>
<s>
The	O
floppy	O
controller	O
on	O
the	O
Tandy	B-Device
2000	I-Device
will	O
accept	O
3.5	O
"	O
low-density	O
720	O
KB	O
floppy	O
drives	O
.	O
</s>
<s>
As	O
of	O
May	O
2019	O
,	O
there	O
is	O
an	O
abandonware	O
site	O
(	O
winworldpc.com	O
)	O
that	O
has	O
available	O
for	O
download	O
a	O
disk	O
image	O
for	O
the	O
latest	O
version	O
of	O
MS-DOS	B-Application
for	O
the	O
Tandy	B-Device
2000	I-Device
.	O
</s>
<s>
It	O
includes	O
instructions	O
for	O
using	O
the	O
IBM	O
1.2MB	O
5.25-inch	O
disk	O
drive	O
(	O
80-track	O
)	O
to	O
create	O
a	O
system	O
disk	O
bootable	O
in	O
the	O
Tandy	B-Device
2000	I-Device
5.25-inch	O
drive	O
.	O
</s>
<s>
This	O
procedure	O
can	O
also	O
be	O
used	O
to	O
create	O
a	O
bootable	O
3.5-inch	O
system	O
disk	O
using	O
an	O
ordinary	O
720KB	O
3.5-inch	O
PC	O
drive	O
;	O
this	O
will	O
boot	O
a	O
Tandy	B-Device
2000	I-Device
if	O
its	O
5.25-inch	O
boot	O
drive	O
is	O
replaced	O
with	O
a	O
low-density	O
720	O
KB	O
3.5	O
inch	O
PC	O
drive	O
.	O
</s>
<s>
The	O
keyboard	O
was	O
an	O
entirely	O
new	O
design	O
made	O
expressly	O
for	O
the	O
Tandy	B-Device
2000	I-Device
.	O
</s>
<s>
The	O
arrangement	O
of	O
the	O
function	O
keys	O
was	O
changed	O
from	O
that	O
of	O
the	O
IBM	B-Device
PC/XT	I-Device
,	O
which	O
had	O
ten	O
on	O
the	O
left	O
hand	O
side	O
of	O
the	O
keyboard	O
in	O
two	O
columns	O
of	O
five	O
.	O
</s>
<s>
The	O
serial	O
port	O
hardware	O
was	O
completely	O
different	O
from	O
the	O
PC/XT	B-Device
'	O
s	O
.	O
</s>
<s>
PC-compatible	O
terminal	O
emulation	O
software	O
had	O
to	O
either	O
maintain	O
strict	O
BIOS	B-Operating_System
usage	O
of	O
the	O
serial	O
hardware	O
,	O
or	O
else	O
use	O
a	O
FOSSIL	B-Protocol
driver	O
,	O
a	O
software	O
wrapper	O
that	O
virtualized	O
the	O
serial	O
hardware	O
(	O
see	O
also	O
DEC	B-Device
Rainbow	I-Device
)	O
,	O
allowing	O
the	O
terminal	O
software	O
to	O
work	O
on	O
a	O
wider	O
variety	O
of	O
hardware	O
.	O
</s>
<s>
Several	O
terminal	O
programs	O
were	O
available	O
for	O
the	O
Tandy	B-Device
2000	I-Device
,	O
making	O
it	O
possible	O
to	O
log	O
on	O
to	O
BBS	B-Application
's	O
,	O
e-mail	O
,	O
and	O
other	O
remote	O
systems	O
.	O
</s>
<s>
The	O
Tandy	B-Device
2000	I-Device
required	O
a	O
specific	O
version	O
of	O
MS-DOS	B-Application
that	O
would	O
run	O
only	O
on	O
this	O
machine	O
.	O
</s>
<s>
Standard	O
MS-DOS	B-Application
or	O
PC	B-Operating_System
DOS	I-Operating_System
(	O
for	O
generic	O
IBM-compatibles	O
)	O
would	O
not	O
run	O
on	O
a	O
Tandy	B-Device
2000	I-Device
.	O
</s>
<s>
It	O
was	O
standard	O
practice	O
and	O
Microsoft	O
's	O
expectation	O
at	O
the	O
time	O
that	O
a	O
customized	O
version	O
of	O
MS-DOS	B-Application
would	O
be	O
prepared	O
for	O
each	O
different	O
machine	O
,	O
with	O
I/O	O
drivers	O
designed	O
for	O
the	O
hardware	O
of	O
that	O
model	O
.	O
</s>
<s>
The	O
highest	O
version	O
of	O
DOS	O
that	O
Tandy	O
Corporation	O
released	O
for	O
the	O
Tandy	B-Device
2000	I-Device
was	O
2.11.03	O
,	O
with	O
a	O
few	O
minor	O
third-party	O
patches	O
after	O
the	O
fact	O
.	O
</s>
<s>
A	O
modified	O
version	O
of	O
Windows	B-Application
1.0	I-Application
was	O
able	O
to	O
run	O
on	O
the	O
Tandy	B-Device
2000	I-Device
.	O
</s>
<s>
MS-DOS	B-Application
for	O
the	O
Tandy	B-Device
2000	I-Device
resided	O
entirely	O
in	O
RAM	O
,	O
unlike	O
the	O
IBM	B-Device
PCs	I-Device
which	O
contained	O
the	O
BIOS	B-Operating_System
portion	O
of	O
the	O
OS	O
in	O
ROM	O
.	O
</s>
<s>
The	O
complete	O
MS-DOS	B-Application
system	O
(	O
BIOS	B-Operating_System
and	O
BDOS	O
)	O
occupied	O
about	O
53	O
KB	O
of	O
RAM	O
.	O
</s>
<s>
This	O
means	O
that	O
the	O
RAM	O
required	O
to	O
run	O
applications	O
on	O
the	O
Tandy	B-Device
2000	I-Device
was	O
a	O
little	O
greater	O
.	O
</s>
<s>
However	O
,	O
the	O
Tandy	B-Device
2000	I-Device
fared	O
better	O
in	O
comparison	O
to	O
the	O
later	O
IBM	B-Operating_System
PC-AT	I-Operating_System
in	O
that	O
the	O
AT	O
was	O
required	O
to	O
run	O
MS-DOS	B-Application
version	O
3.x	O
in	O
order	O
to	O
operate	O
its	O
1.2	O
MB	O
floppy	O
drives	O
and	O
hard	O
drive	O
.	O
</s>
<s>
Version	O
3	O
of	O
MS-DOS	B-Application
was	O
rather	O
larger	O
than	O
Version	O
2.x	O
running	O
on	O
the	O
Tandy	B-Device
2000	I-Device
.	O
</s>
<s>
It	O
also	O
proved	O
advantageous	O
that	O
the	O
Tandy	B-Device
2000	I-Device
's	O
OS	O
resided	O
entirely	O
in	O
RAM	O
and	O
therefore	O
could	O
be	O
updated	O
and	O
hacked	O
with	O
rather	O
less	O
effort	O
.	O
</s>
<s>
It	O
was	O
highly	O
customized	O
for	O
the	O
Tandy	B-Device
2000	I-Device
hardware	O
,	O
particularly	O
its	O
high-resolution	O
color	O
graphics	O
.	O
</s>
<s>
Tandy/Radio	O
Shack	O
produced	O
print	O
advertising	O
featuring	O
Bill	O
Gates	O
of	O
Microsoft	O
extolling	O
the	O
superior	O
performance	O
of	O
the	O
Tandy	B-Device
2000	I-Device
and	O
how	O
it	O
was	O
advantageous	O
in	O
Microsoft	O
's	O
development	O
of	O
Windows	B-Application
1.0	I-Application
.	O
</s>
<s>
Software	O
packages	O
that	O
were	O
released	O
for	O
the	O
Tandy	B-Device
2000	I-Device
included	O
WordPerfect	B-Application
4.2	O
(	O
WP5.1	O
could	O
work	O
with	O
software	O
patches	O
)	O
,	O
Lotus	B-Application
1-2-3	I-Application
,	O
Ashton-Tate	O
'	O
s	O
Framework	B-Application
,	O
DBase	B-Application
,	O
MultiMate	B-Protocol
,	O
Pfs:Write	B-Application
,	O
AutoCAD	B-Algorithm
,	O
Lumena	O
(	O
from	O
Time	O
Arts	O
)	O
shareware	B-License
office	O
programs	O
,	O
and	O
the	O
complete	O
line	O
of	O
Microsoft	O
language	O
products	O
.	O
</s>
<s>
Microsoft	O
released	O
a	O
version	O
of	O
Xenix	B-Application
for	O
the	O
Tandy	B-Device
2000	I-Device
(	O
used	O
with	O
Western	O
Digital	O
's	O
ViaNet	O
network	B-Protocol
card	I-Protocol
,	O
distributed	O
by	O
Tandy	O
)	O
.	O
</s>
<s>
Better	O
BASIC	O
for	O
both	O
the	O
Tandy	B-Device
2000	I-Device
and	O
the	O
PC	O
was	O
used	O
to	O
write	O
BBS	B-Application
software	O
for	O
the	O
Tandy	B-Device
2000	I-Device
and	O
later	O
ported	O
to	O
the	O
IBM	B-Device
PC	I-Device
.	O
</s>
<s>
Radio	O
Shack	O
's	O
Deskmate	B-Device
was	O
also	O
used	O
with	O
the	O
Tandy	B-Device
2000	I-Device
and	O
the	O
Tandy	O
1000	O
.	O
</s>
<s>
MicroPro	B-Application
's	O
Wordstar	B-Application
(	O
versions	O
3.3	O
and	O
4.0	O
only	O
)	O
would	O
run	O
on	O
the	O
Tandy	B-Device
2000	I-Device
provided	O
the	O
user	O
ran	O
the	O
WINSTALL	O
installation	O
utility	O
and	O
,	O
when	O
prompted	O
for	O
the	O
type	O
of	O
video	O
display	O
to	O
be	O
used	O
,	O
selected	O
"	O
ROM	B-Operating_System
BIOS	I-Operating_System
"	O
.	O
</s>
<s>
The	O
only	O
version	O
of	O
Lotus	B-Application
1-2-3	I-Application
offered	O
for	O
the	O
Tandy	B-Device
2000	I-Device
was	O
Release	O
1A	O
.	O
</s>
<s>
This	O
extra	O
space	O
for	O
data	O
,	O
with	O
the	O
additional	O
128	O
KB	O
of	O
RAM	O
available	O
to	O
a	O
fully	O
expanded	O
Tandy	B-Device
2000	I-Device
,	O
made	O
it	O
possible	O
to	O
construct	O
larger	O
worksheets	O
than	O
later	O
PCs	B-Device
running	O
Release	O
2	O
(	O
until	O
the	O
advent	O
of	O
machines	O
with	O
Expanded	B-Device
memory	I-Device
)	O
.	O
</s>
<s>
For	O
nearly	O
two	O
years	O
following	O
its	O
introduction	O
,	O
the	O
Tandy	B-Device
2000	I-Device
was	O
the	O
top	O
performer	O
for	O
processing	O
large	O
models	O
in	O
Lotus	B-Application
1-2-3	I-Application
.	O
</s>
<s>
The	O
Tandy	B-Device
2000	I-Device
's	O
720	O
KB	O
floppy	O
drives	O
were	O
a	O
distinct	O
advantage	O
for	O
running	O
Lotus	O
,	O
because	O
they	O
were	O
large	O
enough	O
to	O
store	O
even	O
the	O
largest	O
worksheets	O
on	O
a	O
single	O
diskette	O
.	O
</s>
<s>
This	O
is	O
in	O
stark	O
contrast	O
to	O
the	O
IBM	B-Device
PC	I-Device
and	O
XT	O
with	O
360	O
KB	O
floppy	O
disks	O
.	O
</s>
<s>
The	O
Tandy	B-Device
2000	I-Device
's	O
large-capacity	O
floppy	O
disks	O
made	O
backup	O
maintenance	O
relatively	O
effortless	O
.	O
</s>
<s>
After	O
Tandy	O
dropped	O
support	O
of	O
the	O
Tandy	B-Device
2000	I-Device
,	O
a	O
group	O
of	O
users	O
formed	O
the	O
Tandy	B-Device
2000	I-Device
Orphans	O
,	O
with	O
software	O
reviews	O
,	O
software	O
and	O
hardware	O
hacks	O
,	O
and	O
a	O
shareware/freeware	O
repository	O
.	O
</s>
<s>
It	O
was	O
discovered	O
by	O
amateur	O
programmers	O
that	O
many	O
commercial	O
MS-DOS	B-Application
applications	O
needed	O
only	O
minor	O
modifications	O
to	O
function	O
on	O
the	O
Tandy	B-Device
2000	I-Device
's	O
unique	O
hardware	O
.	O
</s>
<s>
There	O
was	O
also	O
a	O
BBS	B-Application
based	O
in	O
Texas	O
that	O
had	O
an	O
extensive	O
library	O
of	O
compatible	O
software	O
available	O
for	O
download	O
;	O
neither	O
the	O
BBS	B-Application
nor	O
its	O
web-based	O
descendant	O
is	O
active	O
today	O
.	O
</s>
