<s>
The	O
Sol-20	O
was	O
the	O
first	O
fully	O
assembled	O
microcomputer	B-Architecture
with	O
a	O
built-in	O
keyboard	O
and	O
television	O
output	O
,	O
what	O
would	O
later	O
be	O
known	O
as	O
a	O
home	O
computer	O
.	O
</s>
<s>
The	O
design	O
was	O
a	O
combination	O
of	O
an	O
Intel	O
8080-based	O
motherboard	B-Device
,	O
a	O
VDM-1	B-Device
graphics	B-Device
card	I-Device
,	O
the	O
3P+S	B-Architecture
I/O	O
card	O
to	O
drive	O
a	O
keyboard	O
,	O
and	O
circuitry	O
to	O
connect	O
to	O
a	O
cassette	O
deck	O
for	O
program	O
storage	O
.	O
</s>
<s>
Additional	O
expansion	O
was	O
available	O
via	O
five	O
S-100	B-Architecture
bus	I-Architecture
slots	O
inside	O
the	O
machine	O
.	O
</s>
<s>
It	O
also	O
included	O
swappable	O
ROMs	B-Protocol
,	O
the	O
manufacturer	O
called	O
them	O
'	O
personality	O
modules	O
 '	O
,	O
containing	O
a	O
rudimentary	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
He	O
asked	O
Bob	O
Marsh	O
of	O
Processor	O
Technology	O
if	O
he	O
could	O
design	O
a	O
smart	B-General_Concept
terminal	I-General_Concept
for	O
use	O
with	O
the	O
Altair	B-Architecture
8800	I-Architecture
.	O
</s>
<s>
Reconsidering	O
the	O
design	O
using	O
modern	O
electronics	O
,	O
they	O
agreed	O
the	O
best	O
solution	O
was	O
to	O
build	O
a	O
complete	O
computer	O
with	O
a	O
terminal	O
program	O
in	O
ROM	B-Device
.	O
</s>
<s>
Felsenstein	O
suggested	O
the	O
name	O
"	O
Sol	B-Operating_System
"	O
because	O
they	O
were	O
including	O
"	O
the	O
wisdom	O
of	O
Solomon	O
"	O
in	O
the	O
box	O
.	O
</s>
<s>
The	O
Sol	B-Operating_System
appeared	O
on	O
the	O
cover	O
of	O
the	O
July	O
1976	O
issue	O
of	O
Popular	O
Electronics	O
as	O
a	O
"	O
high-quality	O
intelligent	O
terminal	O
"	O
.	O
</s>
<s>
It	O
was	O
initially	O
offered	O
in	O
three	O
versions	O
;	O
the	O
Sol-PC	O
motherboard	O
in	O
kit	O
form	O
,	O
the	O
Sol-10	O
without	O
expansion	O
slots	O
,	O
and	O
the	O
Sol-20	O
with	O
five	O
slots	O
.	O
</s>
<s>
A	O
Sol-20	O
was	O
taken	O
to	O
the	O
Personal	O
Computing	O
Show	O
in	O
Atlantic	O
City	O
in	O
August	O
1976	O
where	O
it	O
was	O
a	O
hit	O
,	O
building	O
an	O
order	O
backlog	O
that	O
took	O
a	O
year	O
to	O
fill	O
.	O
</s>
<s>
Systems	O
began	O
shipping	O
late	O
that	O
year	O
and	O
were	O
dominated	O
by	O
the	O
expandable	O
Sol-20	O
,	O
which	O
sold	O
for	O
$	O
1,495	O
in	O
its	O
most	O
basic	O
fully-assembled	O
form	O
.	O
</s>
<s>
The	O
company	O
also	O
offered	O
schematics	B-Application
for	O
the	O
system	O
for	O
free	O
for	O
those	O
interested	O
in	O
building	O
their	O
own	O
.	O
</s>
<s>
The	O
Sol-20	O
remained	O
in	O
production	O
until	O
1979	O
,	O
by	O
which	O
point	O
about	O
12,000	O
machines	O
had	O
been	O
sold	O
.	O
</s>
<s>
By	O
that	O
time	O
,	O
the	O
"	O
1977	O
trinity	O
"	O
the	O
Apple	B-Device
II	I-Device
,	O
Commodore	B-Device
PET	I-Device
and	O
TRS-80	B-Device
had	O
begun	O
to	O
take	O
over	O
the	O
market	O
,	O
and	O
a	O
series	O
of	O
failed	O
new	O
product	O
introductions	O
drove	O
Processor	O
Technology	O
into	O
bankruptcy	O
.	O
</s>
<s>
Felsenstein	O
later	O
developed	O
the	O
successful	O
Osborne	B-Device
1	I-Device
computer	O
,	O
using	O
much	O
the	O
same	O
underlying	O
design	O
in	O
a	O
portable	O
format	O
.	O
</s>
<s>
Lee	O
Felsenstein	O
was	O
one	O
of	O
the	O
sysops	O
of	O
Community	O
Memory	O
,	O
the	O
first	O
public	O
bulletin	B-Application
board	I-Application
system	I-Application
.	O
</s>
<s>
Community	O
Memory	O
opened	O
in	O
1973	O
,	O
running	O
on	O
a	O
SDS	B-Device
940	I-Device
mainframe	B-Architecture
that	O
was	O
accessed	O
through	O
a	O
Teletype	B-Application
Model	I-Application
33	I-Application
,	O
essentially	O
a	O
computer	O
printer	O
and	O
keyboard	O
,	O
in	O
a	O
record	O
store	O
in	O
Berkeley	O
,	O
California	O
.	O
</s>
<s>
The	O
cost	O
of	O
running	O
the	O
system	O
was	O
untenable	O
;	O
the	O
teletype	O
normally	O
cost	O
(	O
their	O
first	O
example	O
was	O
donated	O
from	O
Tymeshare	O
as	O
junk	O
)	O
,	O
the	O
modem	B-Application
another	O
,	O
and	O
time	O
on	O
the	O
SDS	O
was	O
expensive	O
in	O
1968	O
Tymshare	O
charged	O
per	O
hour	O
(	O
)	O
.	O
</s>
<s>
The	O
replacement	O
of	O
the	O
Model	O
33	O
with	O
a	O
Hazeltine	B-Device
glass	I-Device
terminal	I-Device
helped	O
,	O
but	O
it	O
required	O
constant	O
repairs	O
.	O
</s>
<s>
One	O
of	O
his	O
earliest	O
designs	O
in	O
the	O
computer	O
field	O
was	O
the	O
Pennywhistle	B-Device
modem	I-Device
,	O
a	O
300	O
bits	O
per	O
second	O
acoustic	B-Device
coupler	I-Device
that	O
was	O
the	O
cost	O
of	O
commercial	O
models	O
.	O
</s>
<s>
When	O
he	O
saw	O
Don	O
Lancaster	O
's	O
TV	B-Device
Typewriter	I-Device
on	O
the	O
cover	O
of	O
the	O
September	O
1973	O
Popular	O
Electronics	O
,	O
he	O
began	O
adapting	O
its	O
circuitry	O
as	O
the	O
basis	O
for	O
a	O
design	O
he	O
called	O
the	O
Tom	O
Swift	O
Terminal	O
.	O
</s>
<s>
January	O
1975	O
was	O
also	O
the	O
month	O
that	O
the	O
Altair	B-Architecture
8800	I-Architecture
appeared	O
on	O
the	O
front	O
page	O
of	O
Popular	O
Electronics	O
,	O
sparking	O
off	O
intense	O
interest	O
among	O
the	O
engineers	O
of	O
the	O
rapidly	O
growing	O
Silicon	O
Valley	O
.	O
</s>
<s>
Marsh	O
began	O
offering	O
Felsenstein	O
contracts	O
to	O
draw	O
schematics	B-Application
or	O
write	O
manuals	O
for	O
the	O
products	O
they	O
planned	O
to	O
introduce	O
.	O
</s>
<s>
This	O
was	O
essentially	O
a	O
version	O
of	O
the	O
terminal	O
where	O
the	O
data	O
would	O
be	O
supplied	O
by	O
the	O
main	O
memory	O
of	O
the	O
Altair	O
rather	O
than	O
a	O
serial	B-Protocol
port	I-Protocol
.	O
</s>
<s>
The	O
result	O
was	O
the	O
VDM-1	B-Device
,	O
the	O
first	O
graphics	B-Device
card	I-Device
.	O
</s>
<s>
The	O
VDM-1	B-Device
could	O
display	O
16	O
lines	O
of	O
64	O
characters	O
per	O
line	O
,	O
and	O
included	O
the	O
complete	O
ASCII	B-Protocol
character	I-Protocol
set	I-Protocol
with	O
upper	O
-	O
and	O
lower-case	O
characters	O
and	O
a	O
number	O
of	O
graphics	O
characters	O
like	O
arrows	O
and	O
basic	O
math	O
symbols	O
.	O
</s>
<s>
An	O
Altair	O
equipped	O
with	O
a	O
VDM-1	B-Device
for	O
output	O
and	O
Processor	O
Technology	O
's	O
3P+S	B-Architecture
card	O
running	O
a	O
keyboard	O
for	O
input	O
removed	O
the	O
need	O
for	O
a	O
terminal	O
,	O
yet	O
cost	O
less	O
than	O
dedicated	O
smart	B-General_Concept
terminal	I-General_Concept
products	O
like	O
the	O
Hazeltine	O
.	O
</s>
<s>
Before	O
the	O
VDM-1	B-Device
was	O
launched	O
in	O
late	O
1975	O
,	O
the	O
only	O
way	O
to	O
program	O
the	O
Altair	O
was	O
through	O
its	O
front-panel	O
switches	O
and	O
LED	O
lamps	O
,	O
or	O
by	O
purchasing	O
a	O
serial	B-Protocol
card	I-Protocol
and	O
using	O
a	O
terminal	O
of	O
some	O
sort	O
.	O
</s>
<s>
Normally	O
the	O
teletypes	O
were	O
not	O
available	O
Teletype	O
Corporation	O
typically	O
sold	O
them	O
only	O
to	O
large	O
commercial	O
customers	O
,	O
which	O
led	O
to	O
a	O
thriving	O
market	O
for	O
broken-down	O
machines	O
that	O
could	O
be	O
repaired	O
and	O
sold	O
into	O
the	O
microcomputer	B-Architecture
market	O
.	O
</s>
<s>
Les	O
Solomon	O
,	O
whose	O
Popular	O
Electronics	O
magazine	O
launched	O
the	O
Altair	O
,	O
felt	O
a	O
low-cost	O
smart	B-General_Concept
terminal	I-General_Concept
would	O
be	O
highly	O
desirable	O
in	O
the	O
rapidly	O
expanding	O
microcomputer	B-Architecture
market	O
.	O
</s>
<s>
In	O
December	O
1975	O
,	O
Solomon	O
traveled	O
to	O
Phoenix	O
to	O
meet	O
with	O
Don	O
Lancaster	O
to	O
ask	O
about	O
using	O
his	O
TV	B-Device
Typewriter	I-Device
as	O
a	O
video	O
display	O
in	O
a	O
terminal	O
.	O
</s>
<s>
Marsh	O
,	O
in	O
parallel	O
,	O
sketched	O
out	O
a	O
version	O
using	O
the	O
Intel	B-General_Concept
8080	I-General_Concept
.	O
</s>
<s>
The	O
kit	O
concept	O
would	O
make	O
it	O
through	O
to	O
the	O
release	O
,	O
at	O
which	O
time	O
it	O
was	O
known	O
as	O
the	O
Sol-PC	O
.	O
</s>
<s>
Marsh	O
had	O
a	O
woodworker	O
friend	O
build	O
a	O
large	O
light	B-Application
table	I-Application
and	O
Felsenstein	O
and	O
the	O
layout	O
artist	O
began	O
using	O
it	O
to	O
design	O
the	O
printed	O
circuit	O
board	O
for	O
the	O
motherboard	B-Device
.	O
</s>
<s>
The	O
final	O
product	O
consisted	O
of	O
a	O
single	O
motherboard	B-Device
with	O
the	O
8080	B-General_Concept
,	O
a	O
simplified	O
version	O
of	O
the	O
VDM-1	B-Device
,	O
serial	O
input/output	O
,	O
and	O
1k	O
of	O
SRAM	B-Architecture
for	O
the	O
screen	O
buffer	O
.	O
</s>
<s>
A	O
ROM	B-Device
,	O
the	O
"	O
personality	O
module	O
"	O
,	O
would	O
include	O
the	O
terminal	O
driver	O
or	O
other	O
code	O
which	O
would	O
begin	O
running	O
as	O
soon	O
as	O
the	O
machine	O
was	O
turned	O
on	O
.	O
</s>
<s>
The	O
first	O
motherboard	B-Device
arrived	O
45	O
days	O
after	O
the	O
project	O
started	O
,	O
and	O
the	O
first	O
cases	O
and	O
power	O
supplies	O
about	O
15	O
days	O
after	O
that	O
.	O
</s>
<s>
By	O
this	O
point	O
it	O
was	O
clear	O
the	O
system	O
was	O
a	O
usable	O
microcomputer	B-Architecture
on	O
its	O
own	O
,	O
but	O
"	O
the	O
decision	O
was	O
made	O
to	O
soft-pedal	O
the	O
fact	O
until	O
the	O
last	O
possible	O
moment	O
.	O
</s>
<s>
As	O
the	O
machine	O
increasingly	O
expanded	O
in	O
power	O
,	O
Felsenstein	O
suggested	O
the	O
name	O
"	O
Sol	B-Operating_System
"	O
,	O
because	O
they	O
were	O
including	O
"	O
the	O
wisdom	O
of	O
Solomon	O
"	O
in	O
the	O
system	O
.	O
</s>
<s>
Les	O
Solomon	O
would	O
later	O
quip	O
that	O
"	O
if	O
it	O
worked	O
,	O
they	O
'll	O
say	O
Sol	B-Operating_System
means	O
'	O
sun	O
 '	O
in	O
Spanish	O
.	O
</s>
<s>
As	O
he	O
pointed	O
out	O
the	O
features	O
,	O
Solomon	O
asked	O
what	O
was	O
stopping	O
anyone	O
from	O
putting	O
a	O
BASIC	O
on	O
the	O
personality	O
ROM	B-Device
.	O
</s>
<s>
The	O
order	O
book	O
was	O
officially	O
opened	O
and	O
Sol	B-Operating_System
was	O
a	O
huge	O
hit	O
at	O
this	O
show	O
.	O
</s>
<s>
Soon	O
after	O
,	O
Marsh	O
was	O
invited	O
to	O
demonstrate	O
the	O
Sol	B-Operating_System
on	O
NBC	O
's	O
The	O
Tomorrow	O
Show	O
.	O
</s>
<s>
The	O
Sol	B-Operating_System
was	O
initially	O
offered	O
in	O
three	O
versions	O
.	O
</s>
<s>
The	O
base	O
motherboard	B-Device
was	O
offered	O
as	O
the	O
Sol-PC	O
,	O
available	O
as	O
a	O
kit	O
for	O
,	O
or	O
fully	O
assembled	O
and	O
tested	O
for	O
.	O
</s>
<s>
The	O
Sol-10	O
added	O
a	O
case	O
,	O
keyboard	O
and	O
power	O
supply	O
,	O
was	O
in	O
kit	O
form	O
and	O
assembled	O
.	O
</s>
<s>
Finally	O
the	O
Sol-20	O
added	O
a	O
keyboard	O
with	O
numeric	B-Algorithm
keypad	O
,	O
and	O
a	O
larger	O
power	O
supply	O
to	O
feed	O
the	O
five	O
expansion	O
slots	O
and	O
a	O
fan	O
to	O
cool	O
them	O
,	O
for	O
as	O
a	O
kit	O
or	O
assembled	O
.	O
</s>
<s>
Advertising	O
of	O
the	O
time	O
referred	O
to	O
the	O
Sol-20	O
as	O
"	O
The	O
first	O
complete	O
small	O
computer	O
under	O
"	O
.	O
</s>
<s>
Most	O
systems	O
would	O
require	O
additional	O
pieces	O
,	O
which	O
they	O
bundled	O
as	O
the	O
"	O
Sol	B-Operating_System
Systems	O
"	O
;	O
the	O
Sol	B-Operating_System
System	O
I	O
consisted	O
of	O
a	O
Sol-20	O
,	O
an	O
8k	O
RAM	O
card	O
,	O
a	O
PT-872	O
monitor	O
and	O
the	O
RQ-413	O
Cassette	O
Recorder	O
,	O
for	O
.	O
</s>
<s>
In	O
keeping	O
with	O
the	O
hacker	O
ethic	O
,	O
the	O
company	O
also	O
offered	O
to	O
send	O
out	O
copies	O
of	O
the	O
schematic	B-Application
for	O
the	O
motherboard	B-Device
for	O
the	O
cost	O
of	O
postage	O
,	O
later	O
estimating	O
that	O
somewhere	O
between	O
40,000	O
and	O
50,000	O
copies	O
were	O
sent	O
.	O
</s>
<s>
Few	O
,	O
if	O
any	O
,	O
Sol-10s	O
were	O
sold	O
,	O
and	O
the	O
company	O
focused	O
on	O
the	O
Sol-20	O
.	O
</s>
<s>
Processor	O
Technology	O
invited	O
all	O
of	O
their	O
dealers	O
to	O
a	O
meeting	O
in	O
Emeryville	O
,	O
California	O
,	O
outside	O
Berkeley	O
,	O
to	O
introduce	O
their	O
Helios	O
floppy	B-Device
disk	I-Device
drive	I-Device
for	O
,	O
along	O
with	O
their	O
PTDOS	B-Operating_System
system	O
to	O
work	O
with	O
it	O
.	O
</s>
<s>
They	O
also	O
promised	O
larger	O
memory	O
cards	O
and	O
a	O
color	O
video	B-Device
card	I-Device
.	O
</s>
<s>
Diablo	O
had	O
been	O
purchased	O
by	O
Xerox	O
in	O
1972	O
,	O
and	O
shortly	O
after	O
the	O
Helios	O
was	O
announced	O
,	O
Xerox	O
canceled	O
development	O
of	O
the	O
floppy	B-Device
line	O
.	O
</s>
<s>
It	O
was	O
at	O
about	O
this	O
point	O
that	O
Radio	O
Shack	O
introduced	O
the	O
TRS-80	B-Device
.	O
</s>
<s>
Like	O
the	O
Sol	B-Operating_System
,	O
it	O
was	O
a	O
complete	O
all-in-one	O
machine	O
but	O
came	O
with	O
its	O
own	O
monitor	O
and	O
sold	O
for	O
about	O
half	O
the	O
price	O
.	O
</s>
<s>
Sales	O
of	O
the	O
Sol	B-Operating_System
plummeted	O
.	O
</s>
<s>
Meanwhile	O
,	O
the	O
company	O
failed	O
to	O
introduce	O
any	O
of	O
the	O
other	O
new	O
products	O
it	O
mentioned	O
,	O
notably	O
the	O
color	O
graphics	B-Device
card	I-Device
.	O
</s>
<s>
When	O
the	O
Apple	B-Device
II	I-Device
appeared	O
with	O
color	O
graphics	O
,	O
it	O
quickly	O
became	O
a	O
best	O
seller	O
.	O
</s>
<s>
To	O
add	O
to	O
their	O
woes	O
,	O
Processor	O
Technology	O
had	O
contracted	O
North	O
Star	O
Computers	O
to	O
write	O
a	O
new	O
version	O
of	O
the	O
BASIC	O
for	O
the	O
Sol	B-Operating_System
machines	O
.	O
</s>
<s>
North	O
Star	O
then	O
began	O
selling	O
the	O
resulting	O
North	B-Language
Star	I-Language
BASIC	I-Language
to	O
other	O
vendors	O
as	O
well	O
.	O
</s>
<s>
A	O
patch	O
that	O
allowed	O
CP/M	B-Application
to	O
run	O
on	O
the	O
new	O
drives	O
killed	O
off	O
any	O
interest	O
in	O
alternatives	O
like	O
PTDOS	B-Operating_System
,	O
and	O
new	O
business	O
applications	O
like	O
WordStar	B-Application
and	O
Electric	B-Application
Pencil	I-Application
soon	O
cemented	O
CP/M	B-Application
as	O
the	O
standard	O
operating	B-General_Concept
system	I-General_Concept
for	O
all	O
S-100	O
machines	O
.	O
</s>
<s>
Processor	O
Technology	O
continued	O
selling	O
the	O
Helios	O
system	O
and	O
refused	O
to	O
consider	O
replacing	O
PTDOS	B-Operating_System
with	O
CP/M	B-Application
.	O
</s>
<s>
From	O
the	O
Sol	B-Operating_System
Systems	O
Manual	O
unless	O
otherwise	O
noted	O
.	O
</s>
<s>
Looking	O
at	O
the	O
Sol-20	O
from	O
the	O
front	O
,	O
where	O
the	O
operator	O
would	O
sit	O
,	O
the	O
keyboard	O
was	O
in	O
a	O
typical	O
location	O
with	O
the	O
main	O
QWERTY-style	O
layout	O
on	O
the	O
left	O
and	O
the	O
numeric	B-Algorithm
keypad	O
on	O
the	O
right	O
.	O
</s>
<s>
On	O
the	O
rear	O
right	O
of	O
the	O
case	O
(	O
as	O
seen	O
from	O
the	O
front	O
)	O
,	O
directly	O
to	O
the	O
rear	O
of	O
the	O
numeric	B-Algorithm
keypad	O
,	O
was	O
the	O
power	O
supply	O
,	O
which	O
also	O
provided	O
a	O
fan	O
to	O
cool	O
the	O
circuitry	O
.	O
</s>
<s>
The	O
main	O
motherboard	B-Device
sat	O
to	O
the	O
left	O
of	O
the	O
power	O
supply	O
,	O
spanning	O
about	O
of	O
the	O
case	O
's	O
width	O
.	O
</s>
<s>
The	O
motherboard	B-Device
extended	O
forward	O
under	O
the	O
keyboard	O
all	O
the	O
way	O
to	O
the	O
front	O
of	O
the	O
case	O
.	O
</s>
<s>
Cassette	O
,	O
parallel	O
and	O
serial	B-Protocol
ports	I-Protocol
extended	O
off	O
the	O
back	O
of	O
the	O
motherboard	B-Device
into	O
holes	O
in	O
the	O
case	O
.	O
</s>
<s>
Directly	O
below	O
the	O
fan	O
,	O
was	O
a	O
UHF	B-Protocol
connector	I-Protocol
that	O
produced	O
composite	O
video	O
output	O
.	O
</s>
<s>
The	O
original	O
Altair	B-Architecture
bus	I-Architecture
design	O
lacked	O
signal	O
ground	O
pins	O
for	O
each	O
of	O
its	O
data	O
lines	O
,	O
a	O
decision	O
that	O
had	O
been	O
made	O
in	O
order	O
to	O
reduce	O
pin	O
count	O
and	O
allow	O
it	O
to	O
fit	O
into	O
100-pin	O
connectors	O
they	O
found	O
in	O
surplus	O
.	O
</s>
<s>
The	O
Sol	B-Operating_System
solved	O
this	O
problem	O
by	O
supporting	O
only	O
one	O
of	O
the	O
two	O
data	O
busses	O
at	O
a	O
time	O
,	O
allowing	O
input	O
or	O
output	O
and	O
switching	O
between	O
them	O
by	O
signaling	O
with	O
the	O
DBIN	O
pin	O
on	O
the	O
8080	B-General_Concept
.	O
</s>
<s>
The	O
same	O
50-pin	O
concept	O
was	O
instead	O
implemented	O
in	O
an	O
internal	O
expansion	O
chassis	O
,	O
the	O
Sol-BPB	O
.	O
</s>
<s>
This	O
extended	O
vertically	O
upwards	O
from	O
roughly	O
the	O
center	O
of	O
the	O
motherboard	B-Device
.	O
</s>
<s>
This	O
change	O
to	O
the	O
bus	O
design	O
was	O
contentious	O
,	O
as	O
it	O
meant	O
cards	O
for	O
the	O
Altair	O
did	O
not	O
work	O
in	O
the	O
Sol	B-Operating_System
without	O
some	O
adjustments	O
.	O
</s>
<s>
SOLED	O
included	O
block-mode	O
editing	O
,	O
used	O
on	O
some	O
mainframe	B-Architecture
systems	O
,	O
but	O
it	O
is	O
not	O
clear	O
if	O
this	O
was	O
actually	O
available	O
.	O
</s>
<s>
One	O
commonly	O
used	O
software	O
for	O
the	O
Sol-20	O
was	O
the	O
BASIC/5	O
language	O
.	O
</s>
<s>
This	O
was	O
able	O
to	O
run	O
in	O
even	O
a	O
minimal	O
machine	O
with	O
a	O
4KB	O
expansion	O
,	O
but	O
in	O
order	O
to	O
fit	O
it	O
had	O
only	O
single-precision	O
floating	B-Algorithm
point	I-Algorithm
numbers	I-Algorithm
and	O
lacked	O
string	O
variables	O
.	O
</s>
<s>
Processor	O
Technology	O
also	O
sold	O
a	O
wide	O
variety	O
of	O
other	O
programs	O
,	O
including	O
many	O
games	O
,	O
on	O
cassette	O
format	O
for	O
the	O
Sol	B-Operating_System
,	O
or	O
on	O
punch	O
tape	O
for	O
other	O
S-100	O
machines	O
.	O
</s>
