<s>
The	O
TV	B-Device
Typewriter	I-Device
is	O
a	O
video	O
terminal	O
that	O
could	O
display	O
two	O
pages	O
of	O
16	O
lines	O
of	O
32	O
upper	O
case	O
characters	O
on	O
a	O
standard	O
television	O
set	O
.	O
</s>
<s>
The	O
TV	B-Device
Typewriter	I-Device
is	O
considered	O
a	O
milestone	O
in	O
the	O
home	O
computer	O
revolution	O
along	O
with	O
the	O
Mark-8	B-Device
and	O
Altair	B-Architecture
8800	I-Architecture
computers	O
.	O
</s>
<s>
The	O
video	O
project	O
gave	O
Don	O
the	O
inspiration	O
for	O
his	O
most	O
influential	O
project	O
,	O
a	O
low	O
cost	O
video	O
terminal	O
known	O
as	O
the	O
TV	B-Device
Typewriter	I-Device
.	O
</s>
<s>
Built	O
in	O
the	O
era	O
before	O
widespread	O
availability	O
of	O
low-cost	O
microprocessors	B-Architecture
or	O
solid-state	O
computer	B-General_Concept
memory	I-General_Concept
,	O
the	O
system	O
used	O
small-scale	O
integration	O
TTL	B-General_Concept
digital	I-General_Concept
logic	O
and	O
shift	B-General_Concept
register	I-General_Concept
memory	O
.	O
</s>
<s>
In	O
the	O
November	O
issue	O
,	O
the	O
editors	O
apologized	O
for	O
the	O
delays	O
in	O
shipping	O
the	O
TV	B-Device
Typewriter	I-Device
booklets	O
to	O
the	O
thousands	O
of	O
readers	O
that	O
ordered	O
them	O
.	O
</s>
<s>
Don	O
Lancaster	O
also	O
answered	O
a	O
series	O
of	O
reader	O
questions	O
and	O
gave	O
ideas	O
for	O
additional	O
functions	O
and	O
uses	O
for	O
the	O
TV	B-Device
Typewriter	I-Device
.	O
</s>
<s>
The	O
December	O
issue	O
had	O
a	O
page	O
of	O
corrections	O
for	O
the	O
TV	B-Device
Typewriter	I-Device
booklet	O
.	O
</s>
<s>
The	O
compact	O
design	O
and	O
complex	O
circuitry	O
made	O
the	O
TV	B-Device
Typewriter	I-Device
a	O
challenging	O
project	O
for	O
hobbyists	O
.	O
</s>
<s>
But	O
many	O
finished	O
the	O
project	O
and	O
some	O
even	O
connected	O
it	O
to	O
their	O
Intel	B-General_Concept
8008	I-General_Concept
based	O
computers	O
.	O
</s>
<s>
The	O
April	O
1975	O
issue	O
of	O
the	O
Micro-8	O
Newsletter	O
has	O
6	O
pages	O
of	O
user	O
modifications	O
and	O
interface	O
designs	O
to	O
connect	O
the	O
TV	B-Device
Typewriter	I-Device
to	O
Mark-8	B-Device
or	O
SCELBI	B-Device
computers	O
.	O
</s>
<s>
The	O
original	O
TV	B-Device
Typewriter	I-Device
design	O
did	O
not	O
include	O
a	O
serial	O
interface	O
,	O
modem	O
connection	O
,	O
or	O
offline	O
data	O
storage	O
on	O
cassette	O
tape	O
.	O
</s>
<s>
Don	O
Lancaster	O
wrote	O
about	O
these	O
in	O
the	O
September	O
1975	O
issue	O
of	O
BYTE	O
magazine	O
and	O
his	O
TV	B-Device
Typewriter	I-Device
Cookbook	O
.	O
</s>
<s>
Surplus	O
keyboards	O
were	O
available	O
to	O
hobbyists	O
but	O
they	O
often	O
produced	O
codes	O
other	O
than	O
ASCII	B-Protocol
,	O
such	O
as	O
Baudot	O
or	O
EBCDIC	B-Language
.	O
</s>
<s>
The	O
TV	B-Device
Typewriter	I-Device
project	O
and	O
kit	O
did	O
not	O
include	O
a	O
keyboard	O
.	O
</s>
<s>
Most	O
hobbyists	O
chose	O
to	O
use	O
a	O
surplus	O
keyboard	O
and	O
modified	O
it	O
to	O
produce	O
ASCII	B-Protocol
codes	I-Protocol
.	O
</s>
<s>
Don	O
Lancaster	O
's	O
prototype	O
TV	B-Device
Typewriter	I-Device
which	O
is	O
now	O
on	O
display	O
at	O
the	O
Computer	O
History	O
Museum	O
has	O
a	O
surplus	O
keyboard	O
with	O
an	O
ASCII	B-Protocol
encoder	O
circuit	O
that	O
was	O
published	O
in	O
the	O
February	O
1974	O
issue	O
of	O
Radio-Electronics	O
.	O
</s>
<s>
The	O
original	O
TV	B-Device
Typewriter	I-Device
was	O
difficult	O
to	O
assemble	O
and	O
some	O
of	O
the	O
ICs	O
were	O
going	O
out	O
of	O
production	O
so	O
Southwest	O
Technical	O
Products	O
decided	O
to	O
redesign	O
the	O
kit	O
.	O
</s>
<s>
The	O
replacement	O
was	O
featured	O
in	O
Radio	O
Electronics	O
as	O
the	O
TV	B-Device
Typewriter	I-Device
II	O
.	O
</s>
<s>
Daniel	O
Meyer	O
of	O
SWTPC	O
enlisted	O
Ed	O
Colle	O
,	O
an	O
engineer	O
who	O
had	O
worked	O
at	O
Datapoint	O
on	O
terminal	O
design	O
,	O
to	O
design	O
the	O
new	O
TV	B-Device
Typewriter	I-Device
.	O
</s>
<s>
The	O
SWTPC	O
CT-1024	B-Device
Terminal	O
displayed	O
32	O
characters	O
by	O
16	O
lines	O
without	O
scrolling	O
.	O
</s>
<s>
It	O
used	O
common	O
TTL	B-General_Concept
parts	O
and	O
2102	O
static	O
RAMs	B-Architecture
.	O
</s>
<s>
The	O
first	O
advertisement	O
for	O
the	O
CT-1024	B-Device
appeared	O
in	O
the	O
January	O
1975	O
issue	O
of	O
Popular	O
Electronics	O
on	O
the	O
page	O
facing	O
the	O
Altair	B-Architecture
8800	I-Architecture
computer	O
article	O
.	O
</s>
<s>
The	O
CT-1024	B-Device
was	O
very	O
successful	O
because	O
a	O
complete	O
kit	O
with	O
options	O
cost	O
only	O
.	O
</s>
<s>
Resistor	O
–	O
transistor	O
logic	O
(	O
RTL	O
)	O
was	O
an	O
early	O
IC	O
technology	O
that	O
was	O
replaced	O
by	O
TTL	B-General_Concept
,	O
so	O
in	O
1974	O
he	O
published	O
the	O
TTL	B-General_Concept
Cookbook	O
.	O
</s>
<s>
The	O
original	O
TV	B-Device
Typewriter	I-Device
was	O
designed	O
before	O
low	O
cost	O
RAM	B-Architecture
was	O
available	O
and	O
the	O
design	O
was	O
soon	O
obsolete	O
.	O
</s>
<s>
Don	O
had	O
made	O
many	O
design	O
improvements	O
and	O
published	O
them	O
as	O
the	O
TV	B-Device
Typewriter	I-Device
Cookbook	O
in	O
1976	O
.	O
</s>
<s>
The	O
cassette	O
interface	O
design	O
from	O
chapter	O
7	O
was	O
the	O
basis	O
for	O
the	O
Kansas	B-Device
City	I-Device
standard	I-Device
.	O
</s>
<s>
The	O
circuits	O
in	O
this	O
book	O
did	O
not	O
rely	O
on	O
a	O
microprocessor	B-Architecture
,	O
just	O
TTL	B-General_Concept
.	O
</s>
<s>
The	O
TV	O
Cheap	O
Video	O
Cookbook	O
(	O
1978	O
)	O
showed	O
the	O
TVT	O
6	O
5/8	O
that	O
would	O
work	O
with	O
a	O
6502	B-General_Concept
or	O
6800	B-Device
microprocessor	B-Architecture
.	O
</s>
<s>
The	O
design	O
was	O
targeted	O
at	O
the	O
KIM-1	B-Device
Microcomputer	O
.	O
</s>
<s>
The	O
original	O
TV	B-Device
Typewriter	I-Device
book	O
cover	O
shows	O
an	O
ASCII	B-Protocol
keyboard	O
designed	O
by	O
Don	O
Lancaster	O
and	O
sold	O
by	O
Southwest	O
Technical	O
Products	O
.	O
</s>
<s>
An	O
early	O
computer	O
store	O
chain	O
,	O
the	O
Byte	O
Shop	O
,	O
had	O
the	O
publisher	O
add	O
their	O
logo	O
to	O
the	O
covers	O
and	O
sold	O
the	O
TTL	B-General_Concept
Cookbook	O
and	O
the	O
TV	B-Device
Typewriter	I-Device
Cookbook	O
in	O
their	O
stores	O
.	O
</s>
