<s>
The	O
Teletype	B-Application
Model	I-Application
28	I-Application
is	O
a	O
product	O
line	O
of	O
page	O
printers	O
,	O
typing	O
and	O
non-typing	O
tape	O
perforator	O
and	O
tape	O
reperforators	O
,	O
fixed	O
head	O
single	O
contact	O
and	O
pivoted	O
head	O
multi-contact	O
transmitter-distributors	O
,	O
and	O
receiving	O
selector	O
equipment	O
.	O
</s>
<s>
The	O
Teletype	B-Application
Model	I-Application
28	I-Application
is	O
more	O
rugged	O
and	O
more	O
expensive	O
than	O
later	O
Teletype	O
Model	O
32	O
machines	O
.	O
</s>
<s>
The	O
earliest	O
known	O
source	O
for	O
this	O
Teletype	O
Corporation	O
equipment	O
naming	O
discrepancy	O
comes	O
from	O
Digital	O
Equipment	O
Corporation	O
documentation	O
where	O
the	O
September	O
1963	O
PDP-4	O
Brochure	O
calls	O
the	O
Teletype	B-Application
Model	I-Application
28	I-Application
KSR	O
a	O
"	O
KSR-28	O
"	O
in	O
the	O
paragraph	O
titled	O
"	O
Printer-Keyboard	O
and	O
Control	O
Type	O
65	O
"	O
.	O
</s>
<s>
This	O
naming	O
discrepancy	O
continued	O
from	O
the	O
Teletype	B-Application
Model	I-Application
28	I-Application
to	O
other	O
Teletype	O
equipment	O
in	O
later	O
DEC	O
documentation	O
.	O
</s>
<s>
The	O
design	O
objective	O
for	O
the	O
Model	O
28	O
was	O
a	O
machine	O
that	O
would	O
run	O
at	O
100	O
words	B-Device
per	I-Device
minute	I-Device
with	O
less	O
maintenance	O
than	O
that	O
required	O
by	O
a	O
contemporary	O
teletypewriter	O
running	O
at	O
60	O
words	B-Device
per	I-Device
minute	I-Device
.	O
</s>
<s>
The	O
Model	O
28	O
equipment	O
adjustments	O
are	O
made	O
by	O
turning	O
screws	O
and	O
not	O
by	O
bending	O
metal	O
bars	O
and	O
levers	O
as	O
is	O
done	O
in	O
the	O
later	O
Model	O
32	O
and	O
Model	B-Application
33	I-Application
series	O
of	O
teleprinters	O
.	O
</s>
<s>
100	O
words	B-Device
per	I-Device
minute	I-Device
(	O
wpm	B-Device
)	O
,	O
but	O
other	O
speeds	O
are	O
available	O
.	O
</s>
<s>
These	O
speeds	O
include	O
60	O
wpm	B-Device
,	O
61	O
wpm	B-Device
,	O
65	O
wpm	B-Device
,	O
66	O
wpm	B-Device
,	O
67	O
wpm	B-Device
,	O
71	O
wpm	B-Device
,	O
75	O
wpm	B-Device
,	O
81	O
wpm	B-Device
,	O
88	O
wpm	B-Device
,	O
100	O
wpm	B-Device
,	O
106	O
wpm	B-Device
,	O
107	O
wpm	B-Device
and	O
200	O
wpm	B-Device
(	O
on	O
some	O
paper	O
tape	O
equipment	O
)	O
.	O
</s>
<s>
The	O
Teletype	B-Application
Model	I-Application
28	I-Application
KSR	O
,	O
first	O
delivered	O
to	O
the	O
United	O
States	O
Navy	O
in	O
1951	O
,	O
represented	O
approximately	O
twelve	O
years	O
of	O
research	O
and	O
design	O
.	O
</s>
<s>
The	O
Teletype	B-Application
Model	I-Application
28	I-Application
KSR	O
was	O
produced	O
as	O
a	O
floor	O
,	O
table	O
and	O
wall	O
model	O
.	O
</s>
<s>
The	O
Teletype	B-Application
Model	I-Application
28	I-Application
ASR	O
,	O
introduced	O
in	O
1957	O
,	O
was	O
designed	O
and	O
built	O
using	O
existing	O
stand-alone	O
components	O
and	O
packaged	O
as	O
a	O
console	O
.	O
</s>
<s>
The	O
Teletype	B-Application
Model	I-Application
28	I-Application
ASR	O
is	O
40	O
inches	O
high	O
,	O
36	O
inches	O
wide	O
and	O
18.5	O
inches	O
deep	O
,	O
excluding	O
the	O
keyboard	O
.	O
</s>
<s>
The	O
Teletype	B-Application
Model	I-Application
28	I-Application
ASR	O
weighs	O
260	O
pounds	O
.	O
</s>
<s>
The	O
Teletype	B-Application
Model	I-Application
28	I-Application
RO	O
is	O
composed	O
of	O
a	O
receive-only	O
base	O
(	O
LB	O
)	O
which	O
supports	O
the	O
motor	O
unit	O
and	O
the	O
typing	O
unit	O
(	O
LP	O
)	O
and	O
incorporates	O
the	O
code	O
selecting	O
mechanisms	O
.	O
</s>
<s>
The	O
Teletype	B-Application
Model	I-Application
28	I-Application
RO	O
is	O
40	O
inches	O
high	O
,	O
20.5	O
inches	O
wide	O
and	O
18.5	O
inches	O
deep	O
.	O
</s>
<s>
This	O
equipment	O
is	O
capable	O
of	O
operating	O
at	O
60	O
,	O
75	O
or	O
100	O
words	B-Device
per	I-Device
minute	I-Device
and	O
operates	O
on	O
a	O
five-level	O
start-stop	O
code	O
,	O
with	O
an	O
option	O
for	O
six-level	O
start-stop	O
code	O
.	O
</s>
<s>
These	O
tape	O
punches	O
are	O
self-contained	O
and	O
motor-driven	O
,	O
operating	O
at	O
speeds	O
up	O
to	O
100	O
words-per-minute	B-Device
.	O
</s>
<s>
These	O
devices	O
are	O
self-contained	O
and	O
motor-driven	O
and	O
operate	O
at	O
speeds	O
up	O
to	O
200	O
words-per-minute	B-Device
.	O
</s>
<s>
The	O
Teletype	B-Application
Model	I-Application
28	I-Application
RT	O
Set	O
is	O
punched	O
tape	O
message	O
and	O
data	O
relay	O
set	O
that	O
receives	O
,	O
punches	O
,	O
prints	O
,	O
stores	O
,	O
reads	O
and	O
transmits	O
five-level	O
paper	O
tape	O
.	O
</s>
<s>
The	O
paper	O
tape	O
readers	O
and	O
punches	O
can	O
be	O
geared	O
at	O
speeds	O
up	O
to	O
200	O
words-per-minute	B-Device
.	O
</s>
<s>
Gears	O
are	O
also	O
available	O
for	O
slower	O
speed	O
operation	O
at	O
60	O
,	O
75	O
or	O
100	O
words-per-minute	B-Device
.	O
</s>
<s>
Optional	O
three-speed	O
gear-shift	O
mechanisms	O
are	O
also	O
available	O
for	O
manual	O
speed	O
change	O
operation	O
at	O
speeds	O
of	O
60	O
,	O
75	O
and	O
100	O
words-per-minute	B-Device
.	O
</s>
<s>
The	O
Model	O
28	O
Tape	O
Punch	O
Set	O
is	O
a	O
multi-magnet	O
reperforator	O
,	O
also	O
known	O
as	O
the	O
LARP	O
,	O
and	O
capable	O
of	O
producing	O
5	O
,	O
6	O
,	O
7	O
or	O
8	O
level	O
paper	O
tape	O
at	O
speeds	O
up	O
to	O
20	O
characters	B-Device
per	I-Device
minute	I-Device
from	O
a	O
parallel	O
wire	O
input	O
.	O
</s>
<s>
The	O
Model	O
35	O
line	O
,	O
built	O
for	O
ASCII	B-Protocol
,	O
used	O
a	O
similar	O
mechanical	O
structure	O
and	O
shared	O
numerous	O
parts	O
.	O
</s>
