<s>
The	O
Tandy	O
1000	O
is	O
the	O
first	O
in	O
a	O
line	O
of	O
IBM	B-Device
PC	I-Device
compatible	O
home	O
computer	O
systems	O
produced	O
by	O
the	O
Tandy	O
Corporation	O
for	O
sale	O
in	O
its	O
Radio	O
Shack	O
and	O
Radio	O
Shack	O
Computer	O
Center	O
chains	O
of	O
stores	O
.	O
</s>
<s>
In	O
December	O
1983	O
,	O
an	O
executive	O
with	O
Tandy	O
Corporation	O
,	O
maker	O
of	O
TRS-80	B-Device
computers	O
,	O
said	O
about	O
the	O
new	O
IBM	B-Device
PCjr	I-Device
:	O
"	O
I	O
'm	O
sure	O
a	O
lot	O
of	O
people	O
will	O
be	O
coming	O
out	O
with	O
PCjr	B-Device
look-alikes	O
.	O
</s>
<s>
While	O
preparing	O
the	O
Tandy	B-Device
2000	I-Device
—	O
the	O
company	O
's	O
first	O
MS-DOS	B-Application
computer	O
—	O
for	O
release	O
in	O
November	O
1983	O
,	O
Tandy	O
began	O
designing	O
the	O
Tandy	O
1000	O
,	O
code	O
named	O
"	O
August	O
"	O
.	O
</s>
<s>
Unlike	O
the	O
2000	O
it	O
would	O
be	O
PC	O
compatible	O
with	O
the	O
IBM	B-Device
PC	I-Device
,	O
and	O
support	O
the	O
PCjr	B-Device
graphics	O
standard	O
.	O
</s>
<s>
Released	O
in	O
November	O
1984	O
,	O
the	O
$	O
1,200	O
Tandy	O
1000	O
offers	O
the	O
same	O
functionality	O
as	O
the	O
PCjr	B-Device
,	O
but	O
with	O
an	O
improved	O
keyboard	O
and	O
better	O
expandability	O
and	O
compatibility	O
.	O
</s>
<s>
"	O
How	O
could	O
IBM	O
have	O
made	O
that	O
mistake	O
with	O
the	O
PCjr	B-Device
?	O
"	O
</s>
<s>
an	O
amazed	O
Tandy	O
executive	O
said	O
regarding	O
its	O
chiclet	B-Device
keyboard	I-Device
,	O
and	O
another	O
claimed	O
that	O
the	O
1000	O
"	O
is	O
what	O
the	O
PCjr	B-Device
should	O
have	O
been	O
"	O
.	O
</s>
<s>
The	O
Tandy	B-Device
2000	I-Device
—	O
not	O
completely	O
PC	O
compatible	O
—	O
quickly	O
failed	O
.	O
</s>
<s>
Although	O
the	O
press	O
saw	O
the	O
1000	O
as	O
former	O
personal-computer	O
leader	O
Tandy	O
admitting	O
that	O
it	O
could	O
no	O
longer	O
focus	O
on	O
proprietary	O
products	O
in	B-Device
a	I-Device
market	I-Device
the	I-Device
IBM	I-Device
PC	I-Device
dominated	I-Device
,	O
the	O
1000	O
sold	O
more	O
units	O
in	O
the	O
first	O
month	O
than	O
any	O
other	O
Tandy	O
product	O
and	O
by	O
early	O
1985	O
was	O
its	O
best-selling	O
computer	O
.	O
</s>
<s>
The	O
1000	O
has	O
joystick	B-Protocol
ports	I-Protocol
like	O
the	O
PCjr	B-Device
,	O
and	O
its	O
16-color	O
graphics	O
and	O
3-voice	O
sound	O
,	O
but	O
not	O
the	O
PCjr	B-Device
ROM	B-Protocol
cartridge	I-Protocol
ports	O
.	O
</s>
<s>
Since	O
IBM	O
discontinued	O
the	O
PCjr	B-Device
soon	O
after	O
the	O
release	O
of	O
the	O
1000	O
,	O
Tandy	O
quickly	O
removed	O
mentions	O
of	O
the	O
PCjr	B-Device
in	O
its	O
advertising	O
while	O
emphasizing	O
its	O
product	O
's	O
PC	O
compatibility	O
.	O
</s>
<s>
Although	O
Tandy	O
initially	O
marketed	O
the	O
1000	O
as	O
a	O
business	O
computer	O
like	O
the	O
IBM	B-Device
PC	I-Device
,	O
InfoWorld	O
stated	O
in	O
1985	O
that	O
the	O
company	O
"	O
produced	O
a	O
real	O
home	O
computer	O
"	O
.	O
</s>
<s>
The	O
1000	O
and	O
its	O
many	O
successors	O
were	O
successful	O
,	O
unlike	O
the	O
PCjr	B-Device
,	O
partly	O
because	O
it	O
was	O
sold	O
in	O
ubiquitous	O
Radio	O
Shack	O
stores	O
and	O
partly	O
because	O
the	O
computer	O
was	O
less	O
costly	O
,	O
easier	O
to	O
expand	O
,	O
and	O
almost	O
entirely	O
compatible	O
with	O
the	O
IBM	B-Device
PC	I-Device
.	O
</s>
<s>
The	O
PCjr	B-Device
's	O
enhanced	O
graphics	O
and	O
sound	O
standards	O
became	O
known	O
as	O
"	O
Tandy-compatible	O
"	O
.	O
</s>
<s>
With	O
its	O
graphics	O
,	O
sound	O
,	O
and	O
built-in	O
joystick	B-Protocol
ports	I-Protocol
,	O
the	O
1000	O
was	O
the	O
best	O
computer	O
for	O
PC	O
games	O
until	O
VGA	B-Protocol
graphics	I-Protocol
became	O
popular	O
in	O
the	O
1990s	O
.	O
</s>
<s>
Tandy	O
1000	O
computers	O
were	O
some	O
of	O
the	O
first	O
IBM	B-Device
PC	I-Device
clones	O
to	O
incorporate	O
a	O
complete	O
set	O
of	O
basic	O
peripherals	O
on	O
the	O
motherboard	O
using	O
proprietary	O
ASICs	O
,	O
the	O
forerunner	O
of	O
the	O
chipset	B-Device
.	O
</s>
<s>
Although	O
the	O
original	O
Tandy	O
1000	O
comes	O
in	O
an	O
IBM	O
PC-like	O
desktop	B-General_Concept
case	I-General_Concept
,	O
some	O
models	O
,	O
notably	O
the	O
1000	O
EX	O
and	O
1000	O
HX	O
,	O
use	O
home-computer-style	O
cases	O
with	O
the	O
keyboard	O
,	O
motherboard	O
and	O
disk	O
drives	O
in	O
one	O
enclosure	O
.	O
</s>
<s>
This	O
high	O
level	O
of	O
integration	O
made	O
these	O
machines	O
a	O
cost-effective	O
alternative	O
to	O
larger	O
and	O
more	O
complex	O
IBM	O
PC/XT	O
and	O
PC/AT	B-Operating_System
-type	O
systems	O
,	O
which	O
require	O
multiple	O
add-in	O
cards	O
,	O
often	O
purchased	O
separately	O
,	O
to	O
implement	O
a	O
comparable	O
feature-set	O
to	O
the	O
Tandy	O
1000	O
.	O
</s>
<s>
Being	O
derived	O
from	O
IBM	O
's	O
PCjr	B-Device
architecture	O
,	O
the	O
Tandy	O
1000	O
offers	O
several	O
important	O
features	O
that	O
most	O
IBM	O
PC-compatibles	O
of	O
the	O
time	O
lacks	O
,	O
such	O
as	O
the	O
PCjr	B-Device
's	O
sound	O
generator	O
and	O
extended	O
CGA-compatible	O
graphics	O
controller	O
.	O
</s>
<s>
It	O
also	O
offers	O
multiple	O
built-in	O
I/O	O
ports	O
,	O
including	O
a	O
game	B-Protocol
port	I-Protocol
port	O
which	O
was	O
frequently	O
a	O
separate	O
add-on	O
card	O
on	O
non-Tandy	O
machines	O
.	O
</s>
<s>
The	O
original	O
line	O
is	O
equipped	O
with	O
the	O
Intel	B-Device
8088	I-Device
CPU	B-General_Concept
,	O
which	O
was	O
later	O
extended	O
to	O
faster	O
clock	O
speeds	O
and	O
also	O
the	O
8086	B-General_Concept
,	O
80286	B-General_Concept
and	O
toward	O
the	O
end	O
of	O
the	O
line	O
with	O
the	O
RSX	O
,	O
80386SX	O
processors	O
.	O
</s>
<s>
Tandy	O
1000	O
TL/2	O
,	O
Tandy	B-Device
1000	I-Device
RL/HD	I-Device
)	O
.	O
</s>
<s>
It	O
is	O
sure	O
to	O
put	O
a	O
whopping	O
dent	O
not	O
only	O
into	O
PCjr	B-Device
sales	O
,	O
but	O
into	O
sales	O
of	O
the	O
PC	O
'	O
senior	O
 '	O
as	O
well	O
"	O
.	O
</s>
<s>
He	O
favorably	O
mentioned	O
its	O
low	O
price	O
,	O
good	O
PC-software	O
compatibility	O
,	O
and	O
bundled	O
DeskMate	B-Device
(	O
"	O
you	O
might	O
never	O
need	O
another	O
software	O
package	O
for	O
your	O
computer	O
"	O
)	O
.	O
</s>
<s>
The	O
magazine	O
concluded	O
that	O
"	O
Tandy	O
's	O
machine	O
closely	O
emulates	O
the	O
most	O
basic	O
functions	O
of	O
an	O
IBM	B-Device
PC	I-Device
,	O
and	O
it	O
does	O
so	O
at	O
an	O
affordable	O
price	O
...	O
along	O
with	O
the	O
security	O
of	O
Tandy	O
's	O
substantial	O
support	O
network	O
"	O
,	O
but	O
wondered	O
if	O
people	O
would	O
buy	O
the	O
1000	O
if	O
IBM	O
lowered	O
the	O
price	O
of	O
the	O
PC	O
.	O
</s>
<s>
InfoWorld	O
noted	O
the	O
1000s	O
low	O
price	O
(	O
"	O
fully	O
one-third	O
less	O
than	O
a	O
comparably	O
equipped	O
IBM	B-Device
PC	I-Device
"	O
)	O
,	O
predicted	O
that	O
the	O
computer	O
was	O
really	O
intended	O
for	O
"	O
the	O
elusive	O
home	O
computer	O
market	O
"	O
,	O
and	O
speculated	O
that	O
"	O
in	O
retrospect	O
it	O
might	O
have	O
been	O
the	O
PCjr	B-Device
's	O
final	O
straw	O
"	O
.	O
</s>
<s>
The	O
magazine	O
called	O
the	O
1000	O
"	O
almost	O
as	O
fully	O
IBM	B-Device
PC	I-Device
compatible	O
as	O
a	O
computer	O
can	O
get	O
"	O
,	O
but	O
gave	O
DeskMate	B-Device
a	O
mixed	O
review	O
and	O
advised	O
customers	O
of	O
the	O
computer	O
's	O
inability	O
to	O
use	O
full-length	O
PC	O
expansion	O
cards	O
.	O
</s>
<s>
It	O
concluded	O
that	O
"	O
By	O
making	O
the	O
1000	O
inexpensive	O
and	O
adaptable	O
"	O
and	O
including	O
DeskMate	B-Device
,	O
"	O
Tandy	O
produced	O
a	O
real	O
home	O
computer	O
"	O
.	O
</s>
<s>
BYTE	B-Application
called	O
the	O
1000	O
"	O
a	O
good	O
,	O
reasonably	O
priced	O
IBM	B-Device
PC	I-Device
clone	O
that	O
has	O
most	O
of	O
the	O
best	O
features	O
of	O
the	O
IBM	B-Device
PC	I-Device
and	O
PCjr	B-Device
...	O
at	O
current	O
prices	O
it	O
is	O
a	O
very	O
good	O
alternative	O
"	O
.	O
</s>
<s>
It	O
noted	O
the	O
high	O
level	O
of	O
software	O
compatibility	O
and	O
the	O
good	O
keyboard	O
,	O
and	O
stated	O
that	O
DeskMate	B-Device
was	O
"	O
fairly	O
good	O
...	O
but	O
a	O
little	O
extra	O
programming	O
work	O
could	O
have	O
turned	O
 [ it ] 	O
into	O
a	O
much	O
better	O
program	O
"	O
,	O
noting	O
that	O
—	O
for	O
example	O
—	O
the	O
word	O
processor	O
did	O
not	O
have	O
a	O
Move	O
command	O
.	O
</s>
<s>
All	O
Tandy	O
1000	O
computers	O
feature	O
built-in	O
video	O
hardware	O
,	O
enhanced	O
sound	O
hardware	O
(	O
based	O
on	O
one	O
of	O
several	O
variants	O
of	O
the	O
Texas	B-Device
Instruments	I-Device
SN76496	I-Device
sound	O
generator	O
)	O
and	O
several	O
peripheral	O
interfaces	O
,	O
including	O
game	B-Protocol
ports	I-Protocol
compatible	O
with	O
those	O
on	O
the	O
TRS-80	B-Device
Color	I-Device
Computer	I-Device
,	O
an	O
IBM-standard	O
floppy-disk	O
controller	O
supporting	O
two	O
drives	O
,	O
and	O
a	O
parallel	B-Device
printer	I-Device
port	I-Device
,	O
all	O
integrated	O
into	O
the	O
motherboard	O
in	O
addition	O
to	O
the	O
hardware	O
standard	O
on	O
the	O
IBM	O
PC/XT	O
and	O
,	O
in	O
later	O
Tandy	O
1000	O
models	O
,	O
PC/AT	B-Operating_System
motherboards	O
.	O
</s>
<s>
For	O
the	O
original	O
Tandy	O
1000	O
,	O
the	O
designers	O
omitted	O
a	O
direct	B-General_Concept
memory	I-General_Concept
access	I-General_Concept
(	O
DMA	B-General_Concept
)	O
controller	O
because	O
the	O
PCjr	B-Device
does	O
not	O
have	O
one	O
,	O
and	O
they	O
believed	O
that	O
those	O
who	O
needed	O
it	O
would	O
add	O
it	O
with	O
additional	O
memory	O
for	O
the	O
computer	O
;	O
they	O
omitted	O
the	O
RS-232	O
port	O
because	O
all	O
Tandy	O
printers	O
use	O
the	O
parallel	B-Device
port	I-Device
and	O
,	O
they	O
believed	O
,	O
most	O
customers	O
would	O
use	O
internal	O
modems	O
.	O
</s>
<s>
Unlike	O
most	O
PC	O
clones	O
,	O
several	O
Tandy	O
1000	O
computers	O
have	O
MS-DOS	B-Application
built	O
into	O
ROM	B-Device
and	O
can	O
boot	O
in	O
a	O
few	O
seconds	O
.	O
</s>
<s>
Tandy	O
bundled	O
DeskMate	B-Device
,	O
a	O
graphical	O
suite	O
of	O
consumer-oriented	O
applications	O
,	O
with	O
various	O
Tandy	O
1000	O
models	O
.	O
</s>
<s>
With	O
the	O
exception	O
of	O
the	O
RLX	O
and	O
RSX	O
,	O
the	O
Tandy	O
1000	O
machines	O
are	O
XT-class	O
machines	O
,	O
which	O
cannot	O
support	O
extended	B-Device
memory	I-Device
despite	O
some	O
models	O
using	O
80286	B-General_Concept
processors	O
.	O
</s>
<s>
The	O
RLX	O
is	O
an	O
oddity	O
,	O
as	O
it	O
is	O
an	O
XT-class	O
machine	O
that	O
supports	O
384KB	O
of	O
extended	B-Device
memory	I-Device
,	O
and	O
the	O
RSX	O
is	O
a	O
fully	O
AT-class	O
machine	O
which	O
can	O
support	O
up	O
to	O
9MB	O
of	O
extended	B-Device
memory	I-Device
.	O
</s>
<s>
With	O
the	O
exception	O
of	O
the	O
1000	O
EX	O
and	O
HX	O
,	O
Tandy	O
used	O
industry	O
standard	O
8-bit	O
XT	O
ISA	B-Architecture
slots	I-Architecture
in	O
their	O
desktop	O
models	O
,	O
including	O
the	O
SX	O
,	O
TX	O
,	O
SL	O
,	O
and	O
TL	O
series	O
,	O
but	O
the	O
actual	O
length	O
is	O
limited	O
to	O
10.5	O
inches	O
or	O
shorter	O
,	O
rather	O
than	O
the	O
industry	O
standard	O
XT	O
length	O
of	O
13	O
inches	O
.	O
</s>
<s>
While	O
many	O
8-bit	O
cards	O
meet	O
this	O
length	O
requirement	O
,	O
some	O
cards	O
such	O
as	O
hard	B-Device
cards	I-Device
,	O
EMS	O
memory	O
cards	O
,	O
and	O
multifunction	O
cards	O
that	O
require	O
the	O
standard	O
13	O
"	O
length	O
do	O
not	O
fit	O
in	O
the	O
1000	O
's	O
case	O
.	O
</s>
<s>
The	O
EX	O
and	O
HX	O
utilize	O
a	O
PLUS-style	O
connector	O
,	O
which	O
is	O
electronically	O
identical	O
to	O
an	O
8-bit	O
XT	O
ISA	B-Architecture
slot	I-Architecture
,	O
but	O
has	O
a	O
62-pin	O
Berg	B-Device
connector	I-Device
instead	O
of	O
a	O
card	O
edge	O
,	O
rendering	O
it	O
incompatible	O
with	O
ISA	B-Architecture
cards	I-Architecture
without	O
an	O
adapter	O
.	O
</s>
<s>
The	O
1000	O
RSX	O
features	O
two	O
16-bit	O
AT	O
ISA	B-Architecture
slots	I-Architecture
.	O
</s>
<s>
Most	O
of	O
the	O
desktop-type	O
Tandy	O
1000	O
units	O
can	O
accept	O
regular	O
8-bit	O
ISA	B-Architecture
bus	I-Architecture
MFM	B-Protocol
,	O
RLL	B-Protocol
and	O
SCSI	B-Architecture
controllers	O
like	O
typical	O
XT-class	O
machines	O
;	O
however	O
,	O
care	O
has	O
to	O
be	O
taken	O
when	O
configuring	O
the	O
cards	O
so	O
that	O
they	O
do	O
not	O
cause	O
conflicts	O
with	O
the	O
on-board	O
Tandy-designed	O
peripherals	O
.	O
</s>
<s>
For	O
most	O
Tandy	O
1000	O
models	O
(	O
other	O
than	O
the	O
compact	O
EX	O
and	O
HX	O
)	O
that	O
do	O
not	O
come	O
equipped	O
with	O
a	O
hard	O
drive	O
,	O
Tandy	O
offered	O
hard	O
disk	O
options	O
in	O
the	O
form	O
of	O
hardcards	B-Device
that	O
are	O
installed	O
in	O
one	O
of	O
the	O
computer	O
's	O
expansion	O
slots	O
and	O
consist	O
of	O
a	O
controller	O
and	O
drive	O
(	O
typically	O
a	O
3.5-inch	O
MFM	B-Protocol
or	O
RLL	B-Protocol
unit	O
with	O
a	O
Western	O
Digital	O
controller	O
)	O
mounted	O
together	O
on	O
a	O
metal	O
bracket	O
.	O
</s>
<s>
Their	O
own	O
20	O
MB	O
hard	B-Device
card	I-Device
was	O
offered	O
for	O
$799	O
,	O
though	O
compatible	O
third-party	O
units	O
were	O
available	O
.	O
</s>
<s>
Although	O
this	O
arrangement	O
providses	O
a	O
neat	O
physical	O
coupling	O
between	O
the	O
controller	O
and	O
the	O
disk	O
,	O
single-sector	O
internal	O
transfers	O
and	O
dependence	O
on	O
the	O
speed	O
of	O
the	O
host	O
machine	O
to	O
transfer	O
data	O
to	O
memory	O
means	O
that	O
a	O
trial-and-error	O
approach	O
was	O
still	O
needed	O
to	O
set	O
the	O
disk	O
interleave	B-Application
correctly	O
to	O
ensure	O
optimum	O
transfer	O
rates	O
.	O
</s>
<s>
Starting	O
with	O
the	O
Tandy	O
1000	O
TL/2	O
,	O
XT	O
IDE	B-Protocol
controllers	O
are	O
integrated	O
onto	O
the	O
motherboard	O
.	O
</s>
<s>
However	O
,	O
these	O
are	O
incompatible	O
with	O
common	O
AT	B-Protocol
IDE	I-Protocol
hard	O
drives	O
.	O
</s>
<s>
The	O
TL/2	O
,	O
TL/3	O
,	O
RL	O
and	O
RLX	O
all	O
use	O
the	O
XT	O
IDE	B-Protocol
interface	O
,	O
where	O
the	O
later	O
(	O
and	O
significantly	O
upgraded	O
)	O
RSX	O
is	O
the	O
only	O
Tandy	O
1000	O
model	O
computer	O
to	O
use	O
a	O
standard	O
AT	B-Protocol
IDE	I-Protocol
interface	O
.	O
</s>
<s>
One	O
option	O
for	O
modern	O
users	O
of	O
these	O
systems	O
is	O
to	O
install	O
and	O
use	O
XT	O
ISA	B-Architecture
CompactFlash	O
adapter	O
;	O
this	O
is	O
also	O
the	O
most	O
practical	O
way	O
to	O
install	O
a	O
hard	O
drive	O
into	O
a	O
Tandy	O
1000	O
EX	O
or	O
HX	O
,	O
using	O
an	O
adapter	O
cable	O
that	O
adapts	O
the	O
male	O
PLUS-style	O
connector	O
to	O
an	O
8-bit	O
ISA	B-Architecture
card-edge	O
slot	O
.	O
</s>
<s>
Tandy	O
1000	O
,	O
SX	O
,	O
and	O
TX	O
use	O
a	O
proprietary	O
8-pin	O
round	O
DIN	O
connector	O
for	O
the	O
keyboard	O
port	O
that	O
is	O
compatible	O
with	O
the	O
older	O
TRS	O
computers	O
but	O
not	O
compatible	O
with	O
the	O
IBM	B-Operating_System
PC/AT	I-Operating_System
or	O
PS/2	B-Device
standard	O
.	O
</s>
<s>
The	O
SL/TL	O
and	O
later	O
use	O
a	O
more	O
directly	O
PC/XT	O
-compatible	O
keyboard	O
protocol	O
,	O
and	O
the	O
1000	O
RSX	O
used	O
a	O
PC/AT	B-Operating_System
and	O
PS/2	B-Device
-compatible	O
protocol	O
.	O
</s>
<s>
Tandy	O
1000	O
uses	O
a	O
proprietary	O
6-pin	O
female	O
round	O
connector	O
for	O
the	O
joystick	B-Protocol
port	I-Protocol
that	O
on	O
the	O
SX/TX	O
i	O
adjacent	O
to	O
the	O
keyboard	O
port	O
in	O
the	O
front	O
of	O
the	O
computer	O
.	O
</s>
<s>
As	O
with	O
the	O
keyboard	O
,	O
it	O
is	O
compatible	O
with	O
the	O
older	O
TRS-80	B-Device
and	O
Tandy	B-Device
color	I-Device
computer	I-Device
models	O
,	O
but	O
not	O
compatible	O
with	O
the	O
IBM	O
standard	O
15-pin	O
male	O
game	B-Protocol
port	I-Protocol
.	O
</s>
<s>
Some	O
DOS	O
games	O
do	O
not	O
work	O
with	O
these	O
joystick	B-Protocol
ports	I-Protocol
,	O
but	O
those	O
that	O
support	O
Tandy	O
1000	O
graphics	O
and	O
sound	O
work	O
.	O
</s>
<s>
Early	O
Tandy	O
1000	O
models	O
use	O
a	O
non-standard	O
card-edge	O
parallel	B-Device
printer	I-Device
port	I-Device
rather	O
than	O
industry	O
standard	O
DB-25	O
printer	B-Device
port	I-Device
.	O
</s>
<s>
It	O
requires	O
a	O
Tandy-1000	O
compatible	O
printer	O
cable	O
to	O
connect	O
to	O
a	O
standard	O
printer	O
parallel	B-Device
port	I-Device
.	O
</s>
<s>
Tandy	O
shipped	O
PCs	O
with	O
their	O
own	O
customized	O
version	O
of	O
MS-DOS	B-Application
,	O
which	O
are	O
compatible	O
with	O
Tandy	O
graphics	O
and	O
keyboard	O
.	O
</s>
<s>
The	O
most	O
current	O
version	O
of	O
MS-DOS	B-Application
for	O
Tandy	O
1000	O
is	O
DOS	O
3.22	O
.	O
</s>
<s>
Tandy	O
1000s	O
came	O
shipped	O
with	O
one	O
of	O
several	O
varieties	O
of	O
DeskMate	B-Device
,	O
the	O
company	O
's	O
own	O
GUI	B-Application
productivity	O
software	O
suite	O
.	O
</s>
<s>
In	O
addition	O
,	O
the	O
hardware	O
detection	O
routine	O
for	O
the	O
installer	O
of	O
Microsoft	B-Application
MS-DOS	I-Application
6	O
can	O
corrupt	O
the	O
serial	O
EEPROM	B-General_Concept
of	O
Tandy	O
1000	O
HX	O
machines	O
.	O
</s>
<s>
Tandy	O
1000s	O
can	O
work	O
with	O
Windows	B-Application
1.0	I-Application
,	O
2.0	B-Application
,	O
and	O
3.0	B-Application
but	O
not	O
3.1	B-Application
,	O
with	O
the	O
exception	O
of	O
the	O
RLX	O
which	O
can	O
run	O
Windows	B-Application
3.1	I-Application
in	O
Standard	O
mode	O
,	O
and	O
the	O
RSX	O
which	O
fully	O
supports	O
Windows	B-Application
3.1	I-Application
in	O
386	O
Enhanced	O
mode	O
.	O
</s>
<s>
The	O
layout	O
of	O
the	O
keyboard	O
prefigured	O
the	O
IBM	B-Device
Model	I-Device
M	I-Device
keyboard	I-Device
,	O
with	O
function	O
keys	O
arranged	O
in	O
a	O
row	O
at	O
the	O
top	O
,	O
instead	O
of	O
on	O
the	O
left	O
as	O
in	O
the	O
PC	O
and	O
PC	O
XT/AT	O
.	O
</s>
<s>
Later	O
models	O
of	O
the	O
Tandy	O
1000	O
series	O
,	O
such	O
as	O
the	O
1000	O
SL	O
,	O
TL	O
,	O
and	O
RL	O
series	O
use	O
a	O
keyboard	O
more	O
similar	O
and	O
compatible	O
with	O
the	O
IBM	B-Device
PS/2	I-Device
series	O
keyboard	O
connector	O
and	O
layout	O
.	O
</s>
<s>
As	O
the	O
Tandy	O
1000	O
uses	O
the	O
same	O
game	B-Protocol
ports	I-Protocol
as	O
the	O
Tandy	B-Device
Color	I-Device
Computer	I-Device
series	O
,	O
the	O
26-3025	O
Color	O
Mouse	O
and	O
26-3125	O
Deluxe	O
Mouse	O
are	O
compatible	O
with	O
the	O
Tandy	O
1000	O
,	O
though	O
not	O
all	O
DOS	O
software	O
and	O
drivers	O
recognize	O
them	O
.	O
</s>
<s>
The	O
Tandy	O
Digi-Mouse	O
requires	O
a	O
separate	O
controller	O
that	O
was	O
available	O
in	O
either	O
ISA	B-Architecture
or	O
PLUS	O
format	O
.	O
</s>
<s>
Systems	O
with	O
RS-232C	O
serial	O
ports	O
can	O
use	O
standard	O
serial	O
mice	O
,	O
and	O
later	O
systems	O
,	O
such	O
as	O
the	O
1000	O
RL	O
,	O
feature	O
a	O
PS/2	B-Device
mouse	O
connector	O
.	O
</s>
<s>
Radio	O
Shack	O
offered	O
a	O
one-button	O
joystick	O
with	O
its	O
proprietary	O
6-pin	O
DIN	O
joystick	O
connector	O
that	O
is	O
compatible	O
with	O
the	O
older	O
TRS-80	B-Device
Color	I-Device
Computer	I-Device
but	O
not	O
standard	O
15-pin	O
IBM	B-Device
PC	I-Device
game	B-Protocol
ports	I-Protocol
often	O
found	O
on	O
sound	O
cards	O
and	O
i/o	O
multifunction	O
ISA	B-Architecture
cards	I-Architecture
.	O
</s>
<s>
Third	O
party	O
modems	O
with	O
speeds	O
of	O
14k	O
baud	O
should	O
work	O
provided	O
they	O
are	O
eight-bit	O
ISA	B-Architecture
,	O
and	O
fit	O
.	O
</s>
<s>
Radio	O
Shack	O
sold	O
the	O
Tandy	O
DMP-130A	O
dot	B-General_Concept
matrix	I-General_Concept
printers	O
to	O
go	O
along	O
with	O
their	O
Tandy	O
1000	O
line	O
,	O
along	O
with	O
compatible	O
card-edged	O
printer	O
cable	O
.	O
</s>
<s>
Tandy	O
wanted	O
to	O
compete	O
in	O
the	O
education	O
,	O
school	O
and	O
home	O
markets	O
dominated	O
by	O
the	O
Apple	B-Device
IIe	I-Device
.	O
</s>
<s>
In	O
1987	O
,	O
the	O
company	O
partnered	O
with	O
Diamond	O
and	O
through	O
Radio	O
Shack	O
sold	O
the	O
Diamond	O
Trackstar	O
128	O
series	O
Apple	B-Device
IIe	I-Device
compatibility	O
board	O
for	O
$399	O
,	O
and	O
offered	O
free	O
installation	O
in	O
their	O
Tandy	O
1000	O
series	O
.	O
</s>
<s>
This	O
peripheral	O
is	O
similar	O
to	O
the	O
Apple	B-Device
IIe	I-Device
Card	I-Device
sold	O
later	O
for	O
certain	O
Macintosh	O
models	O
;	O
it	O
is	O
a	O
fully	O
functional	O
Apple	B-Device
IIe	I-Device
clone	O
with	O
128KB	O
RAM	O
and	O
6502	O
CPU	B-General_Concept
and	O
double	O
high-resolution	O
graphics	O
,	O
which	O
allows	O
Tandy	O
1000	O
computers	O
to	O
run	O
software	O
written	O
for	O
the	O
Apple	B-Device
IIe	I-Device
and	O
IIc	O
platform	O
.	O
</s>
<s>
It	O
was	O
also	O
marketed	O
to	O
home	O
users	O
and	O
businesses	O
interested	O
in	O
having	O
both	O
MS-DOS	B-Application
and	O
Apple	O
II	O
compatibility	O
.	O
</s>
<s>
The	O
board	O
has	O
a	O
pass-through	O
RGB	O
cable	O
and	O
floppy	O
drive	O
cable	O
,	O
and	O
requires	O
an	O
open	O
10-inch	O
8-bit	O
ISA	B-Architecture
slot	I-Architecture
,	O
and	O
uses	O
a	O
boot	O
disk	O
to	O
boot	O
into	O
Apple	O
mode	O
.	O
</s>
<s>
The	O
boot	O
disk	O
has	O
both	O
DOS	O
and	O
Apple	O
software	O
and	O
is	O
copy-protected	B-Application
.	O
</s>
<s>
Compatibility	O
is	O
fairly	O
good	O
and	O
allows	O
Tandy	O
1000	O
owners	O
to	O
run	O
most	O
Apple	O
II	O
software	O
on	O
their	O
Tandy	O
1000	O
machine	O
for	O
less	O
than	O
the	O
cost	O
of	O
owning	O
separate	O
IBM	B-Device
PC	I-Device
and	O
Apple	O
II	O
systems	O
.	O
</s>
<s>
RL/HD	O
:	O
20	O
MBXT-IDE	O
,	O
optional	O
;	O
typically	O
20	O
,	O
30	O
or	O
40	O
MBAT-IDE	O
;	O
typically	O
52	O
MB	O
(	O
504	O
MB	O
max	O
.	O
</s>
<s>
MS-DOS	B-Application
2.11	O
,	O
DeskMate	B-Device
1.0	O
,	O
and	O
a	O
keyboard	O
with	O
the	O
same	O
layout	O
as	O
the	O
Tandy	B-Device
2000	I-Device
's	O
are	O
included	O
with	O
the	O
computer	O
.	O
</s>
<s>
Like	O
the	O
PCjr	B-Device
,	O
the	O
Tandy	O
1000	O
motherboard	O
does	O
not	O
supply	O
DMA	B-General_Concept
,	O
but	O
unlike	O
that	O
system	O
,	O
it	O
can	O
have	O
DMA	B-General_Concept
added	O
with	O
a	O
memory	O
expansion	O
board	O
.	O
</s>
<s>
This	O
revision	O
fixed	O
bugs	O
,	O
scans	O
expansion	O
cards	O
for	O
bootable	O
ROMs	O
,	O
and	O
adds	O
a	O
socket	O
for	O
an	O
Intel	B-Device
8087	I-Device
math	O
coprocessor	O
.	O
</s>
<s>
Two	O
major	O
upgrades	O
over	O
the	O
original	O
Tandy	O
1000	O
are	O
the	O
inclusion	O
of	O
a	O
DMA	B-General_Concept
controller	I-General_Concept
,	O
which	O
improved	O
the	O
speed	O
of	O
diskette	O
operations	O
and	O
IBM	O
PC-compatibility	O
of	O
these	O
systems	O
,	O
and	O
the	O
addition	O
of	O
two	O
additional	O
ISA	B-Architecture
expansion	O
slots	O
,	O
to	O
offer	O
a	O
total	O
of	O
five	O
8-bit	O
ISA	B-Architecture
slots	I-Architecture
.	O
</s>
<s>
The	O
Tandy	O
1000	O
SX	O
uses	O
a	O
7.16MHz	O
8088-2	O
processor	O
,	O
has	O
384KB	O
of	O
memory	O
(	O
upgradeable	O
to	O
640KB	O
on	O
the	O
motherboard	O
)	O
,	O
comes	O
with	O
either	O
one	O
or	O
two	O
5.25	O
"	O
internal	O
floppy	O
disk	O
drives	O
,	O
and	O
has	O
the	O
light	O
pen	O
port	O
(	O
not	O
a	O
serial	O
port	O
)	O
like	O
the	O
original	O
Tandy	O
1000	O
.	O
</s>
<s>
The	O
1000	O
SX	O
comes	O
with	O
MS-DOS	B-Application
3.2	O
and	O
DeskMate	B-Device
II	O
on	O
5.25	O
"	O
360KB	O
diskettes	O
.	O
</s>
<s>
This	O
is	O
to	O
permit	O
the	O
installation	O
of	O
an	O
upgraded	O
graphics	O
card	O
,	O
typically	O
an	O
EGA	B-Device
or	O
VGA	B-Protocol
card	I-Protocol
,	O
in	O
an	O
expansion	O
slot	O
.	O
</s>
<s>
The	O
Tandy	O
1000	O
TX	O
is	O
similar	O
to	O
the	O
1000	O
SX	O
with	O
its	O
detached	O
keyboard	O
,	O
unique	O
parallel	B-Device
port	I-Device
edge	O
connector	O
,	O
and	O
XT-style	O
architecture	O
in	O
a	O
slightly	O
modified	O
case	O
.	O
</s>
<s>
The	O
major	O
difference	O
is	O
the	O
80286	B-General_Concept
CPU	B-General_Concept
clocked	O
at	O
8MHz	O
.	O
</s>
<s>
It	O
features	O
a	O
16-bit-wide	O
memory	O
bus	O
,	O
although	O
the	O
on-board	O
peripherals	O
and	O
ISA	B-Architecture
slots	I-Architecture
are	O
8	O
bits	O
wide	O
.	O
</s>
<s>
This	O
extra	O
128KB	O
can	O
only	O
be	O
used	O
for	O
and	O
by	O
the	O
on-board	O
video	O
controller	O
,	O
so	O
it	O
is	O
impractical	O
to	O
expand	O
the	O
on-board	O
memory	O
beyond	O
640KB	O
if	O
a	O
VGA	B-Protocol
graphics	I-Protocol
card	O
is	O
installed	O
.	O
</s>
<s>
The	O
computer	O
comes	O
bundled	O
with	O
Personal	O
DeskMate	B-Device
2	O
.	O
</s>
<s>
They	O
were	O
offered	O
in	O
a	O
compact	O
,	O
all-in-one	O
chassis	O
that	O
features	O
a	O
7.16MHz	O
8088	B-Device
(	O
capable	O
of	O
clocking	O
down	O
to	O
4.77MHz	O
)	O
,	O
256KB	O
of	O
memory	O
(	O
expandable	O
to	O
640KB	O
with	O
a	O
PLUS	O
memory	O
expansion	O
board	O
)	O
,	O
PCjr	B-Device
-	O
and	O
CGA-compatible	O
Tandy	O
Video	O
graphics	O
controller	O
,	O
a	O
keyboard	O
and	O
,	O
depending	O
on	O
the	O
model	O
,	O
either	O
a	O
single	O
5.25	O
"	O
360KB	O
floppy	O
drive	O
,	O
or	O
one	O
to	O
two	O
3.5	O
"	O
720KB	O
floppy	O
drives	O
.	O
</s>
<s>
A	O
PLUS	O
card	O
connector	O
is	O
electrically	O
identical	O
to	O
an	O
ISA	B-Architecture
slot	I-Architecture
connector	O
,	O
but	O
uses	O
a	O
Berg-style	B-Device
62-pin	O
connector	O
instead	O
of	O
a	O
62-contact	O
ISA	O
card-edge	O
connector	O
.	O
</s>
<s>
Radio	O
Shack	O
later	O
sold	O
an	O
adapter	O
card	O
allowing	O
installation	O
of	O
a	O
PLUS	O
card	O
into	O
a	O
standard	O
ISA	B-Architecture
slot	I-Architecture
,	O
such	O
as	O
those	O
in	O
the	O
larger	O
Tandy	O
1000	O
models	O
.	O
</s>
<s>
Like	O
the	O
original	O
Tandy	O
1000	O
,	O
the	O
EX	O
and	O
HX	O
do	O
not	O
have	O
a	O
built-in	O
DMA	B-General_Concept
controller	I-General_Concept
,	O
though	O
one	O
can	O
be	O
added	O
using	O
the	O
PLUS	O
memory	O
expansion	O
board	O
.	O
</s>
<s>
The	O
1000	O
EX	O
comes	O
with	O
MS-DOS	B-Application
2.11	O
and	O
Personal	O
Deskmate	B-Device
on	O
5.25	O
"	O
360KB	O
diskettes	O
.	O
</s>
<s>
The	O
MS-DOS	B-Application
is	O
a	O
version	O
specialized	O
for	O
and	O
only	O
bootable	O
on	O
the	O
Tandy	O
1000	O
;	O
it	O
includes	O
a	O
version	O
of	O
BASICA	O
(	O
Microsoft	O
's	O
Advanced	O
GW-BASIC	O
)	O
with	O
support	O
for	O
the	O
enhanced	O
CGA	O
graphics	O
modes	O
(	O
a.k.a.	O
</s>
<s>
It	O
also	O
has	O
Tandy	O
MS-DOS	B-Application
2.11R	O
in	O
ROM	B-Device
,	O
which	O
can	O
be	O
accessed	O
by	O
starting	O
the	O
computer	O
with	O
no	O
bootable	O
disk	O
.	O
</s>
<s>
Another	O
improvement	O
over	O
the	O
EX	O
is	O
the	O
addition	O
of	O
a	O
serial	O
EEPROM	B-General_Concept
to	O
store	O
configuration	O
information	O
,	O
enabling	O
similar	O
functionality	O
to	O
later	O
CMOS	O
NVRAMs	O
.	O
</s>
<s>
By	O
comparison	O
,	O
earlier	O
Tandy	O
1000	O
models	O
,	O
like	O
IBM	B-Device
PC	I-Device
and	O
PC/XT	O
systems	O
,	O
use	O
DIP	O
switches	O
and	O
jumpers	O
for	O
startup	O
configuration	O
settings	O
.	O
</s>
<s>
By	O
putting	O
the	O
basic	O
elements	O
of	O
DOS	O
and	O
DeskMate	B-Device
in	O
ROM	B-Device
and	O
eliminating	O
the	O
memory	O
test	O
on	O
startup	O
,	O
the	O
HX	O
boots	O
quickly	O
compared	O
to	O
other	O
contemporary	O
MS-DOS	B-Application
machines	O
,	O
despite	O
having	O
no	O
immediate	O
provisions	O
for	O
a	O
hard	O
disk	O
drive	O
.	O
</s>
<s>
In	O
addition	O
to	O
Tandy	O
MS-DOS	B-Application
2.11R	O
,	O
the	O
HX	O
shipped	O
with	O
Personal	O
Deskmate	B-Device
2	O
.	O
</s>
<s>
Most	O
versions	O
of	O
MS-DOS	B-Application
works	O
with	O
the	O
1000	O
HX	O
,	O
including	O
DOS	O
3.x	O
and	O
some	O
later	O
versions	O
;	O
DOS	O
4.0	O
is	O
incompatible	O
,	O
and	O
the	O
installer	O
for	O
MS-DOS	B-Application
6	O
can	O
corrupt	O
the	O
contents	O
of	O
the	O
serial	O
EEPROM	B-General_Concept
.	O
</s>
<s>
Sound	O
capabilities	O
now	O
include	O
an	O
8-bit	O
monaural	O
DAC/ADC	O
similar	O
in	O
function	O
to	O
parallel	B-Device
port	I-Device
sound	O
devices	O
(	O
such	O
as	O
the	O
Covox	O
Speech	O
Thing	O
and	O
Disney	O
Sound	O
Source	O
)	O
but	O
extended	O
to	O
support	O
DMA	B-General_Concept
transfers	O
,	O
microphone	O
input	O
capability	O
,	O
and	O
sampling	O
rates	O
up	O
to	O
48kHz	O
.	O
</s>
<s>
The	O
SL/TL	O
allow	O
the	O
on-board	O
floppy	O
controller	O
,	O
parallel	B-Device
port	I-Device
and	O
serial	O
ports	O
to	O
be	O
disabled	O
,	O
which	O
the	O
earlier	O
models	O
do	O
not	O
.	O
</s>
<s>
The	O
SL	O
and	O
TL	O
were	O
shipped	O
with	O
MS-DOS	B-Application
3.3	O
and	O
DeskMate	B-Device
3	O
in	O
ROM	B-Device
,	O
and	O
feature	O
a	O
serial	O
EEPROM	B-General_Concept
memory	I-General_Concept
chip	I-General_Concept
to	O
store	O
BIOS	O
settings	O
.	O
</s>
<s>
The	O
machines	O
can	O
also	O
run	O
generic	O
MS-DOS	B-Application
3.x	O
,	O
5.x	O
,	O
and	O
6.x	O
and	O
Windows	O
2.x	O
and	O
3.0	B-Application
operating	O
systems	O
,	O
although	O
Windows	O
is	O
limited	O
to	O
real-mode	O
operations	O
.	O
</s>
<s>
In	O
common	O
with	O
many	O
PC	O
clones	O
of	O
the	O
era	O
,	O
MS-DOS	B-Application
4	O
is	O
problematic	O
and	O
generally	O
avoided	O
.	O
</s>
<s>
The	O
Tandy	O
1000	O
SL	O
and	O
SL/2	O
feature	O
an	O
Intel	B-General_Concept
8086	I-General_Concept
processor	O
running	O
at	O
8MHz	O
.	O
</s>
<s>
This	O
is	O
socketed	O
,	O
and	O
thus	O
upgradeable	O
with	O
an	O
NEC	B-Device
V30	I-Device
.	O
</s>
<s>
Both	O
machines	O
can	O
be	O
expanded	O
to	O
,	O
although	O
the	O
graphics	O
controller	O
reserves	O
a	O
portion	O
of	O
this	O
memory	O
,	O
yielding	O
only	O
to	O
the	O
operating	O
system	O
,	O
even	O
on	O
systems	O
using	O
add-in	O
ISA	B-Architecture
graphic	O
cards	O
.	O
</s>
<s>
The	O
SL	O
series	O
offers	O
five	O
8-bit	O
XT-compatible	O
ISA	B-Architecture
slots	I-Architecture
,	O
and	O
does	O
not	O
come	O
with	O
pre-installed	O
real-time	O
clock	O
chips	O
,	O
making	O
them	O
optional	O
upgrades	O
in	O
the	O
form	O
of	O
the	O
plug-in	O
Dallas	O
DS1216E	O
SmartWatch	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
fitting	O
a	O
hard	O
drive	O
to	O
an	O
SL	O
that	O
already	O
has	O
the	O
upper	O
and	O
lower	O
5.25	O
"	O
bays	O
populated	O
may	O
require	O
either	O
the	O
removal	O
of	O
one	O
of	O
the	O
devices	O
in	O
those	O
bays	O
,	O
or	O
the	O
installation	O
of	O
a	O
hard	O
disk	O
card-style	O
bracket	O
which	O
seats	O
in	O
one	O
of	O
the	O
ISA	B-Architecture
slots	I-Architecture
.	O
</s>
<s>
The	O
Tandy	O
1000	O
TL	O
and	O
TL/2	O
uses	O
8MHz	O
Intel	B-General_Concept
80286	I-General_Concept
processors	O
,	O
whereas	O
the	O
TL/3	O
uses	O
a	O
10MHz	O
80286	B-General_Concept
.	O
</s>
<s>
The	O
TL	O
offers	O
five	O
8-bit	O
XT-compatible	O
ISA	B-Architecture
slots	I-Architecture
,	O
while	O
the	O
TL/2	O
and	O
TL/3	O
offer	O
four	O
slots	O
and	O
an	O
on-board	O
8-bit	O
,	O
XT	O
IDE-compatible	O
hard	O
disk	O
interface	O
,	O
which	O
is	O
not	O
compatible	O
with	O
standard	O
AT	B-Protocol
IDE	I-Protocol
hard	O
drives	O
.	O
</s>
<s>
As	O
the	O
processors	O
on	O
the	O
TL-series	O
are	O
socketed	O
,	O
it	O
is	O
possible	O
to	O
install	O
386SX	O
or	O
Cyrix	O
486SLC-based	O
processor	O
upgrades	O
,	O
though	O
the	O
benefit	O
of	O
installing	O
more	O
advanced	O
processors	O
is	O
limited	O
beyond	O
merely	O
providing	O
a	O
speed	O
increase	O
due	O
to	O
the	O
computers	O
 '	O
XT-based	O
architecture	O
,	O
and	O
their	O
resulting	O
inability	O
to	O
access	O
extended	B-Device
memory	I-Device
above	O
1	O
MB	O
.	O
</s>
<s>
They	O
have	O
a	O
much	O
more	O
compact	O
case	O
,	O
with	O
at	O
least	O
512KB	O
of	O
memory	O
pre-installed	O
,	O
smaller	O
PS/2	B-Device
-style	O
keyboard	O
and	O
mouse	O
ports	O
,	O
and	O
at	O
least	O
one	O
ISA	B-Architecture
expansion	O
slot	O
.	O
</s>
<s>
The	O
RL-series	O
and	O
RSX	O
include	O
provisions	O
for	O
an	O
internal	O
hard	O
disk	O
drive	O
,	O
depending	O
on	O
the	O
model	O
:	O
the	O
RL-series	O
features	O
a	O
built-in	O
XT-IDE	O
hard	O
drive	O
interface	O
,	O
while	O
the	O
RSX	O
features	O
an	O
AT-compatible	O
IDE	B-Protocol
interface	O
.	O
</s>
<s>
The	O
keyboard	O
connectors	O
of	O
the	O
RL-series	O
,	O
while	O
similar	O
to	O
and	O
mechanically	O
compatible	O
with	O
PS/2	B-Device
-style	O
connectors	O
,	O
are	O
not	O
fully	O
compatible	O
with	O
typical	O
PS/2	B-Device
keyboards	O
,	O
as	O
the	O
keyboard	O
uses	O
the	O
XT	O
keyboard	O
protocol	O
.	O
</s>
<s>
The	O
RSX	O
,	O
however	O
,	O
incorporates	O
the	O
AT	O
keyboard	O
protocol	O
,	O
making	O
it	O
the	O
first	O
1000-series	O
system	O
to	O
offer	O
more	O
complete	O
compatibility	O
with	O
typical	O
PS/2	B-Device
keyboards	O
,	O
and	O
AT	O
keyboards	O
using	O
an	O
adapter	O
.	O
</s>
<s>
The	O
RL	O
and	O
RL/HD	O
features	O
a	O
surface-mounted	O
8086	B-General_Concept
processor	O
,	O
512KB	O
of	O
RAM	O
(	O
expandable	O
to	O
768KB	O
to	O
provide	O
128KB	O
for	O
video	O
and	O
640KB	O
conventional	O
memory	O
)	O
,	O
a	O
DB-25	O
unidirectional	O
parallel	B-Device
port	I-Device
instead	O
of	O
the	O
edge-connector	O
ports	O
,	O
and	O
the	O
SL	O
's	O
enhanced	O
graphics	O
and	O
sound	O
.	O
</s>
<s>
These	O
models	O
also	O
has	O
MS-DOS	B-Application
and	O
a	O
portion	O
of	O
DeskMate	B-Device
in	O
ROM	B-Device
,	O
and	O
can	O
therefore	O
boot	O
much	O
faster	O
than	O
many	O
other	O
computers	O
on	O
the	O
market	O
.	O
</s>
<s>
It	O
has	O
a	O
10MHz	O
286	B-General_Concept
(	O
surface-mounted	O
)	O
and	O
512	O
KB	O
of	O
RAM	O
,	O
and	O
unlike	O
other	O
286-based	O
Tandy	O
1000	O
models	O
,	O
it	O
supports	O
384KB	O
of	O
extended	B-Device
memory	I-Device
when	O
RAM	O
is	O
expanded	O
to	O
the	O
maximum	O
1	O
MB	O
.	O
</s>
<s>
However	O
,	O
it	O
is	O
not	O
a	O
full	O
AT-class	O
machine	O
,	O
as	O
it	O
still	O
has	O
an	O
8-bit	O
ISA	B-Architecture
bus	I-Architecture
(	O
as	O
with	O
the	O
RL	O
,	O
one	O
half-size	O
expansion	O
slot	O
)	O
and	O
only	O
8	O
IRQs	O
and	O
4	O
DMA	B-General_Concept
channels	O
.	O
</s>
<s>
While	O
the	O
three-voice	O
sound	O
chip	O
and	O
DAC	O
are	O
still	O
present	O
,	O
Tandy	O
video	O
was	O
dropped	O
in	O
favor	O
of	O
an	O
AcuMos	O
VGA	B-Protocol
controller	O
offering	O
256	O
KB	O
of	O
video	O
memory	O
and	O
standard	O
VGA	B-Protocol
graphics	I-Protocol
resolutions	O
.	O
</s>
<s>
The	O
parallel	B-Device
port	I-Device
is	O
bidirectional	O
,	O
a	O
first	O
for	O
the	O
Tandy	O
1000	O
series	O
.	O
</s>
<s>
A	O
more	O
upscale	O
offering	O
,	O
the	O
RSX	O
offers	O
a	O
25MHz	O
80386SX	O
processor	O
,	O
1	O
MB	O
RAM	O
,	O
two	O
16-bit	O
ISA	B-Architecture
slots	I-Architecture
,	O
AcuMos	O
SVGA	O
video	O
,	O
a	O
bidirectional	O
parallel	B-Device
port	I-Device
,	O
and	O
standard	O
PS/2	B-Device
keyboard	O
and	O
mouse	O
ports	O
.	O
</s>
<s>
With	O
two	O
4	O
MB	O
SIMMs	O
installed	O
,	O
the	O
1000	O
RSX	O
can	O
be	O
expanded	O
to	O
9	O
MB	O
RAM	O
without	O
using	O
an	O
ISA	B-Architecture
slot	I-Architecture
.	O
</s>
<s>
The	O
RSX/HD	O
variant	O
comes	O
with	O
a	O
52	O
MB	O
hard	O
drive	O
using	O
an	O
AT-compatible	O
IDE	B-Protocol
interface	O
;	O
replacement	O
hard	O
drives	O
up	O
to	O
504	O
MB	O
can	O
be	O
substituted	O
.	O
</s>
<s>
The	O
DAC	O
can	O
be	O
used	O
to	O
emulate	O
the	O
Covox	O
Speech	O
Thing	O
via	O
MS-DOS	B-Application
device	O
drivers	O
for	O
limited	O
sound	O
support	O
.	O
</s>
<s>
This	O
works	O
with	O
Chuck	B-Application
Yeager	I-Application
's	I-Application
Air	I-Application
Combat	I-Application
.	O
</s>
<s>
The	O
ACUMOS	O
VGA	B-Protocol
graphics	I-Protocol
can	O
be	O
software-updated	O
with	O
Cirrus	O
Logic	O
BIOS	O
(	O
via	O
MS-DOS	B-Application
driver	O
)	O
to	O
allow	O
VESA/SVGA	O
to	O
function	O
in	O
Windows	O
95	O
,	O
as	O
the	O
Windows	O
3.xx	O
Tandy	O
VGA	B-Protocol
drivers	O
are	O
insufficient	O
for	O
Windows	O
95	O
.	O
</s>
<s>
Software	O
that	O
supported	O
Tandy	O
's	O
graphics	O
are	O
typically	O
labelled	O
on	O
the	O
package	O
as	O
Tandy	O
1000/PCjr	O
compatible	O
.	O
</s>
<s>
The	O
enhanced	O
graphics	O
and	O
sound	O
often	O
tax	O
the	O
processor	O
,	O
so	O
an	O
80286	B-General_Concept
processor	O
or	O
faster	O
is	O
often	O
recommended	O
for	O
best	O
results	O
.	O
</s>
<s>
Examples	O
of	O
such	O
software	O
include	O
Mario	B-Application
Teaches	I-Application
Typing	I-Application
,	O
Star	O
Trek	O
,	O
Freddy	B-Application
Pharkas	I-Application
:	I-Application
Frontier	I-Application
Pharmacist	I-Application
,	O
and	O
Sargon	B-Application
.	O
</s>
