<s>
Turbo	B-Application
Pascal	B-Application
is	O
a	O
software	O
development	O
system	O
that	O
includes	O
a	O
compiler	B-Language
and	O
an	O
integrated	B-Application
development	I-Application
environment	I-Application
(	O
IDE	O
)	O
for	O
the	O
Pascal	B-Application
programming	I-Application
language	I-Application
running	O
on	O
CP/M	B-Application
,	O
CP/M	B-Operating_System
-86	I-Operating_System
,	O
and	O
DOS	B-Device
.	O
</s>
<s>
It	O
was	O
originally	O
developed	O
by	O
Anders	O
Hejlsberg	O
at	O
Borland	O
,	O
and	O
was	O
notable	O
for	O
its	O
extremely	O
fast	O
compilation	B-Language
.	O
</s>
<s>
Turbo	B-Application
Pascal	B-Application
,	O
and	O
the	O
later	O
but	O
similar	O
Turbo	B-Application
C	I-Application
,	O
made	O
Borland	O
a	O
leader	O
in	O
PC-based	O
development	O
.	O
</s>
<s>
For	O
versions	O
6	O
and	O
7	O
(	O
last	O
)	O
,	O
both	O
a	O
lower-priced	O
Turbo	B-Application
Pascal	B-Application
and	O
more	O
expensive	O
Borland	O
Pascal	B-Application
were	O
produced	O
;	O
Borland	O
Pascal	B-Application
was	O
more	O
oriented	O
toward	O
professional	O
software	O
development	O
,	O
with	O
more	O
libraries	O
and	O
standard	O
library	O
source	O
code	O
.	O
</s>
<s>
The	O
name	O
Borland	O
Pascal	B-Application
is	O
also	O
used	O
more	O
generically	O
for	O
Borland	O
's	O
dialect	O
of	O
the	O
Pascal	B-Application
programming	I-Application
language	I-Application
,	O
significantly	O
different	O
from	O
Standard	O
Pascal	B-Application
.	O
</s>
<s>
Borland	O
has	O
released	O
three	O
old	O
versions	O
of	O
Turbo	B-Application
Pascal	B-Application
free	O
of	O
charge	O
because	O
of	O
their	O
historical	O
interest	O
:	O
the	O
original	O
Turbo	B-Application
Pascal	B-Application
(	O
now	O
known	O
as	O
1.0	O
)	O
,	O
and	O
versions	O
3.02	O
and	O
5.5	O
for	O
DOS	B-Device
.	O
</s>
<s>
Philippe	O
Kahn	O
first	O
saw	O
an	O
opportunity	O
for	O
Borland	O
,	O
his	O
newly	O
formed	O
software	O
company	O
,	O
in	O
the	O
field	O
of	O
programming	B-Application
tools	I-Application
.	O
</s>
<s>
Historically	O
,	O
the	O
vast	O
majority	O
of	O
programmers	O
saw	O
their	O
workflow	O
in	O
terms	O
of	O
the	O
edit/compile/link	O
cycle	O
,	O
with	O
separate	O
tools	O
dedicated	O
to	O
each	O
task	O
.	O
</s>
<s>
Programmers	O
wrote	O
source	O
code	O
using	O
a	O
text	B-Application
editor	I-Application
;	O
the	O
source	O
code	O
was	O
then	O
compiled	B-Language
into	O
object	B-Language
code	I-Language
(	O
often	O
requiring	O
multiple	O
passes	O
)	O
,	O
and	O
a	O
linker	B-Application
combined	O
object	B-Language
code	I-Language
with	O
runtime	O
libraries	O
to	O
produce	O
an	O
executable	O
program	O
.	O
</s>
<s>
In	O
the	O
early	O
IBM	O
PC	O
market	O
(	O
1981	O
–	O
1983	O
)	O
the	O
major	O
programming	B-Application
tool	I-Application
vendors	O
all	O
made	O
compilers	B-Language
that	O
worked	O
in	O
a	O
similar	O
fashion	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
Microsoft	B-Language
Pascal	I-Language
system	O
consisted	O
of	O
two	O
compiler	B-Language
passes	O
and	O
a	O
final	O
linking	B-Application
pass	O
(	O
which	O
could	O
take	O
minutes	O
on	O
systems	O
with	O
only	O
floppy	O
disks	O
for	O
secondary	O
storage	O
,	O
although	O
programs	O
were	O
very	O
much	O
smaller	O
than	O
they	O
are	O
today	O
)	O
.	O
</s>
<s>
This	O
process	O
was	O
less	O
resource-intensive	O
than	O
the	O
later	O
integrated	B-Application
development	I-Application
environment	I-Application
(	O
IDE	O
)	O
.	O
</s>
<s>
Vendors	O
of	O
software	B-Application
development	I-Application
tools	I-Application
aimed	O
their	O
products	O
at	O
professional	O
developers	O
,	O
and	O
the	O
price	O
for	O
these	O
basic	O
tools	O
plus	O
ancillary	O
tools	O
like	O
profilers	O
ran	O
into	O
the	O
hundreds	O
of	O
dollars	O
.	O
</s>
<s>
Kahn	O
's	O
idea	O
was	O
to	O
package	O
all	O
these	O
functions	O
in	O
an	O
integrated	O
programming	O
toolkit	O
designed	O
to	O
have	O
much	O
better	O
performance	O
and	O
resource	O
utilisation	O
than	O
the	O
usual	O
professional	O
development	B-Application
tools	I-Application
,	O
and	O
charge	O
a	O
low	O
price	O
for	O
a	O
package	O
integrating	O
a	O
custom	O
text	B-Application
editor	I-Application
,	O
compiler	B-Language
,	O
and	O
all	O
functionality	O
need	O
to	O
produce	O
executable	O
programs	O
.	O
</s>
<s>
The	O
Turbo	B-Application
Pascal	B-Application
compiler	B-Language
was	O
based	O
on	O
the	O
Blue	O
Label	O
Pascal	B-Application
compiler	B-Language
originally	O
produced	O
for	O
the	O
NasSys	O
cassette-based	O
operating	O
system	O
of	O
the	O
Nascom	B-Operating_System
microcomputer	O
in	O
1981	O
by	O
Anders	O
Hejlsberg	O
.	O
</s>
<s>
Borland	O
licensed	O
Hejlsberg	O
's	O
"	O
PolyPascal	O
"	O
compiler	B-Language
core	O
(	O
Poly	O
Data	O
was	O
the	O
name	O
of	O
Hejlsberg	O
's	O
company	O
in	O
Denmark	O
)	O
,	O
and	O
added	O
the	O
user	O
interface	O
and	O
editor	O
.	O
</s>
<s>
Anders	O
Hejlsberg	O
joined	O
the	O
company	O
as	O
an	O
employee	O
and	O
was	O
the	O
architect	O
for	O
all	O
versions	O
of	O
the	O
Turbo	B-Application
Pascal	B-Application
compiler	B-Language
and	O
the	O
first	O
three	O
versions	O
of	O
Borland	B-Language
Delphi	I-Language
.	O
</s>
<s>
The	O
compiler	B-Language
was	O
first	O
released	O
as	O
Compas	O
Pascal	B-Application
for	O
CP/M	B-Application
,	O
and	O
then	O
released	O
on	O
20	O
November	O
1983	O
as	O
Turbo	B-Application
Pascal	B-Application
for	O
CP/M	B-Application
(	O
including	O
the	O
Apple	B-Device
II	I-Device
computer	O
when	O
fitted	O
with	O
a	O
Z-80	B-Device
SoftCard	I-Device
,	O
effectively	O
converting	O
the	O
6502-based	O
Apple	O
into	O
a	O
CP/M	B-Application
machine	O
,	O
the	O
Commodore	O
64	O
with	O
CP/M	B-Application
cartridge	O
,	O
and	O
the	O
later	O
DEC	B-Device
Rainbow	I-Device
)	O
,	O
CP/M	B-Operating_System
-86	I-Operating_System
,	O
and	O
DOS	B-Device
machines	O
.	O
</s>
<s>
On	O
its	O
launch	O
in	O
the	O
United	O
States	O
market	O
,	O
Turbo	B-Application
Pascal	B-Application
retailed	O
for	O
,	O
a	O
very	O
low	O
price	O
for	O
a	O
compiler	B-Language
at	O
the	O
time	O
.	O
</s>
<s>
The	O
integrated	O
Pascal	B-Application
compiler	B-Language
was	O
of	O
good	O
quality	O
compared	O
to	O
other	O
Pascal	B-Application
products	O
of	O
the	O
time	O
.	O
</s>
<s>
The	O
Turbo	B-Application
name	O
alluded	O
to	O
the	O
speed	O
of	O
compiling	B-Language
and	O
of	O
the	O
executables	O
produced	O
.	O
</s>
<s>
The	O
edit/compile/run	O
cycle	O
was	O
fast	O
compared	O
to	O
other	O
Pascal	B-Application
implementations	O
because	O
everything	O
related	O
to	O
building	O
the	O
program	O
was	O
stored	O
in	O
RAM	O
,	O
and	O
because	O
it	O
was	O
a	O
one-pass	B-Language
compiler	I-Language
written	O
in	O
assembly	B-Language
language	I-Language
.	O
</s>
<s>
Compiling	B-Language
was	O
much	O
faster	O
than	O
compilers	B-Language
for	O
other	O
languages	O
(	O
even	O
Borland	O
's	O
own	O
later	O
compilers	B-Language
for	O
C	B-Language
)	O
,	O
and	O
other	O
Pascal	B-Application
compilers	B-Language
,	O
and	O
programmer	O
time	O
was	O
also	O
saved	O
since	O
the	O
program	O
could	O
be	O
compiled	B-Language
and	O
run	O
from	O
the	O
IDE	O
.	O
</s>
<s>
The	O
execution	O
speed	O
of	O
these	O
COM-format	O
programs	O
was	O
a	O
revelation	O
for	O
developers	O
whose	O
only	O
prior	O
experience	O
programming	O
microcomputers	O
was	O
with	O
interpreted	B-Application
BASIC	O
or	O
UCSD	B-Language
Pascal	I-Language
,	O
which	O
compiled	B-Language
to	O
p-code	B-Language
which	O
was	O
then	O
interpreted	B-Application
at	O
runtime	O
.	O
</s>
<s>
Unlike	O
some	O
other	O
development	B-Application
tools	I-Application
,	O
Turbo	B-Application
Pascal	B-Application
disks	O
had	O
no	O
copy	B-Application
protection	I-Application
.	O
</s>
<s>
Turbo	B-Application
Pascal	B-Application
came	O
with	O
the	O
"	O
Book	O
License	O
"	O
:	O
"	O
You	O
must	O
treat	O
this	O
software	O
just	O
like	O
a	O
book	O
...	O
 [ it ] 	O
may	O
be	O
used	O
by	O
any	O
number	O
of	O
people	O
...	O
may	O
be	O
freely	O
moved	O
from	O
one	O
computer	O
location	O
to	O
another	O
,	O
so	O
long	O
as	O
there	O
is	O
no	O
possibility	O
of	O
it	O
being	O
used	O
at	O
one	O
location	O
while	O
it	O
's	O
being	O
used	O
at	O
another.	O
"	O
</s>
<s>
Borland	O
sold	O
about	O
250,000	O
copies	O
of	O
Turbo	B-Application
Pascal	B-Application
in	O
two	O
years	O
,	O
which	O
Bruce	O
F	O
.	O
Webster	O
of	O
Byte	O
described	O
as	O
"	O
an	O
amazing	O
figure	O
for	O
a	O
computer	O
language	O
"	O
.	O
</s>
<s>
Jerry	O
Pournelle	O
wrote	O
in	O
February	O
1984	O
that	O
Turbo	B-Application
Pascal	B-Application
"	O
comes	O
close	O
to	O
what	O
I	O
think	O
the	O
computer	O
industry	O
is	O
headed	O
for	O
:	O
well	O
documented	O
,	O
standard	O
,	O
plenty	O
of	O
good	O
features	O
,	O
and	O
a	O
reasonable	O
price	O
"	O
.	O
</s>
<s>
Borland	O
only	O
wants	O
another	O
"	O
more	O
than	O
the	O
base	O
price	O
,	O
and	O
that	O
"	O
my	O
first	O
impression	O
of	O
Turbo	B-Application
is	O
that	O
it	O
's	O
probably	O
worth	O
.	O
</s>
<s>
It	O
looks	O
to	O
do	O
everything	O
MT+	B-Language
with	O
the	O
Speed	O
Programming	O
Package	O
does	O
,	O
and	O
maybe	O
even	O
do	O
it	O
faster	O
and	O
better	O
"	O
.	O
</s>
<s>
Pournelle	O
reported	O
in	O
July	O
that	O
,	O
according	O
to	O
Kahn	O
,	O
IBM	O
had	O
refused	O
to	O
resell	O
Turbo	B-Application
Pascal	B-Application
unless	O
the	O
price	O
was	O
at	O
least	O
;	O
Pournelle	O
noted	O
that	O
"	O
Turbo	B-Application
is	O
much	O
better	O
than	O
the	O
Pascal	B-Application
IBM	O
sells	O
"	O
,	O
and	O
unlike	O
the	O
latter	O
was	O
compatible	O
with	O
the	O
IBM	B-Device
PCjr	I-Device
.	O
</s>
<s>
Three	O
Byte	O
reviewers	O
praised	O
Turbo	B-Application
Pascal	B-Application
in	O
the	O
same	O
issue	O
,	O
calling	O
the	O
DOS	B-Device
version	O
"	O
without	O
doubt	O
,	O
the	O
best	O
software	O
value	O
I	O
have	O
ever	O
purchased	O
"	O
and	O
the	O
CP/M	B-Application
version	O
"	O
an	O
excellent	O
product	O
"	O
for	O
which	O
"[Borland]	O
deserves	O
praise	O
"	O
.	O
</s>
<s>
Despite	O
finding	O
what	O
"	O
a	O
serious	O
bug	O
"	O
in	O
version	O
3.0	O
,	O
and	O
decreased	O
compatibility	O
with	O
PC	O
clones	O
,	O
Byte	O
in	O
February	O
1986	O
stated	O
that	O
"	O
it	O
is	O
hard	O
to	O
avoid	O
recommending	O
Turbo	B-Application
to	O
anyone	O
who	O
wants	O
to	O
program	O
in	O
Pascal	B-Application
"	O
,	O
citing	O
improved	O
speed	O
and	O
graphic	O
routines	O
.	O
</s>
<s>
When	O
reviewing	O
four	O
other	O
Pascal	B-Application
compilers	B-Language
in	O
December	O
1986	O
,	O
the	O
magazine	O
described	O
Turbo	B-Application
Pascal	B-Application
as	O
"	O
practical	O
and	O
attractive	O
to	O
programmers	O
at	O
all	O
levels	O
of	O
expertise	O
"	O
.	O
</s>
<s>
Webster	O
also	O
praised	O
the	O
language	O
,	O
stating	O
in	O
August	O
1985	O
that	O
Turbo	B-Application
Pascal	B-Application
"	O
is	O
best	O
known	O
for	O
its	O
small	O
size	O
,	O
incredible	O
compile	B-Language
speeds	O
,	O
and	O
fast	O
execution	O
times	O
"	O
.	O
</s>
<s>
He	O
noted	O
that	O
the	O
software	O
's	O
quality	O
and	O
low	O
price	O
was	O
especially	O
surprising	O
after	O
the	O
"	O
JRT	B-Language
Pascal	I-Language
fiasco	O
"	O
,	O
and	O
stated	O
that	O
even	O
at	O
the	O
new	O
higher	O
price	O
,	O
version	O
3.0	O
was	O
"	O
probably	O
still	O
the	O
best	O
software	O
deal	O
on	O
the	O
market	O
"	O
.	O
</s>
<s>
PC	O
Magazine	O
was	O
similarly	O
complimentary	O
in	O
November	O
1984	O
,	O
stating	O
that	O
"	O
nothing	O
like	O
Turbo	B-Application
Pascal	B-Application
has	O
ever	O
existed	O
for	O
PC-DOS	O
before	O
"	O
.	O
</s>
<s>
It	O
praised	O
the	O
software	O
's	O
low	O
price	O
,	O
speed	O
,	O
and	O
unusually	O
good	O
documentation	O
for	O
a	O
compiler	B-Language
,	O
and	O
noted	O
the	O
existence	O
of	O
many	O
utilities	O
for	O
Turbo	B-Application
Pascal	B-Application
from	O
other	O
companies	O
.	O
</s>
<s>
The	O
review	O
stated	O
that	O
the	O
IDE	O
that	O
simplified	O
the	O
edit-compile-run-debug	O
loop	O
made	O
Turbo	B-Application
Pascal	B-Application
accessible	O
,	O
like	O
BASIC	O
,	O
to	O
new	O
programmers	O
.	O
</s>
<s>
Byte	O
in	O
1989	O
listed	O
Turbo	B-Application
C	I-Application
and	O
Turbo	B-Application
Pascal	B-Application
as	O
among	O
the	O
"	O
Distinction	O
"	O
winners	O
of	O
the	O
Byte	O
Awards	O
.	O
</s>
<s>
In	O
the	O
same	O
issue	O
Pournelle	O
again	O
praised	O
version	O
4.0	O
and	O
5.0	O
of	O
Turbo	B-Application
Pascal	B-Application
.	O
</s>
<s>
Citing	O
Anacreon	B-Application
as	O
"	O
a	O
good	O
example	O
of	O
how	O
complex	O
a	O
program	O
you	O
can	O
write	O
in	O
Pascal	B-Application
"	O
,	O
and	O
the	O
many	O
libraries	O
from	O
Borland	O
and	O
other	O
developers	O
,	O
he	O
wrote	O
"	O
I	O
think	O
it	O
may	O
well	O
be	O
the	O
language	O
for	O
the	O
rest	O
of	O
us	O
"	O
.	O
</s>
<s>
Scott	O
MacGregor	O
of	O
Microsoft	O
said	O
that	O
Bill	O
Gates	O
"	O
could	O
n't	O
understand	O
why	O
our	O
stuff	O
was	O
so	O
slow	O
"	O
compared	O
to	O
Turbo	B-Application
Pascal	B-Application
.	O
</s>
<s>
By	O
1995	O
Borland	O
had	O
dropped	O
Turbo/Borland	O
Pascal	B-Application
and	O
replaced	O
it	O
with	O
the	O
rapid	O
application	O
development	O
(	O
RAD	O
)	O
environment	O
Borland	B-Language
Delphi	I-Language
,	O
based	O
on	O
Object	B-Language
Pascal	I-Language
.	O
</s>
<s>
The	O
32	O
-	O
and	O
64-bit	O
Delphi	B-Language
versions	O
still	O
support	O
the	O
more	O
portable	O
Pascal	B-Application
enhancements	O
of	O
the	O
earlier	O
products	O
(	O
i.e.	O
</s>
<s>
This	O
language	O
backwards	O
compatibility	O
means	O
much	O
old	O
Turbo	B-Application
Pascal	B-Application
code	O
can	O
still	O
be	O
compiled	B-Language
and	O
run	O
in	O
a	O
modern	O
environment	O
today	O
.	O
</s>
<s>
Other	O
suppliers	O
have	O
produced	O
software	B-Application
development	I-Application
tools	I-Application
compatible	O
with	O
Turbo	B-Application
Pascal	B-Application
.	O
</s>
<s>
The	O
best-known	O
are	O
Free	B-Operating_System
Pascal	I-Operating_System
and	O
Virtual	B-Application
Pascal	I-Application
.	O
</s>
<s>
Pascal	B-Application
is	O
not	O
case-sensitive	O
.	O
</s>
<s>
Historically	O
,	O
Pascal	B-Application
comments	O
are	O
enclosed	O
{	O
within	O
pairs	O
of	O
braces	O
}	O
,	O
or	O
( *	O
left	O
parenthesis/asterisk	O
and	O
asterisk/right	O
parenthesis	O
pairs	O
*	O
)	O
,	O
and	O
these	O
can	O
span	O
any	O
number	O
of	O
lines	O
.	O
</s>
<s>
Later	O
versions	O
of	O
Borland	O
Pascal	B-Application
also	O
supported	O
C++	B-Language
-style	O
comments	O
//	O
preceded	O
by	O
two	O
forward	O
slashes	O
,	O
which	O
finish	O
at	O
the	O
end	O
of	O
the	O
line	O
.	O
</s>
<s>
The	O
syntax	O
for	O
the	O
statement	O
case	O
is	O
more	O
flexible	O
than	O
standard	O
Pascal	B-Application
.	O
</s>
<s>
The	O
standard	O
Pascal	B-Application
String	O
preceded	O
by	O
a	O
length	O
byte	O
is	O
supported	O
,	O
and	O
takes	O
a	O
fixed	O
amount	O
of	O
storage	O
;	O
later	O
versions	O
added	O
a	O
more	O
flexible	O
null-terminated	O
type	O
,	O
calling	O
the	O
older	O
type	O
"	O
short	O
string	O
"	O
.	O
</s>
<s>
This	O
is	O
the	O
classic	O
Hello	O
world	O
program	O
in	O
Turbo	B-Application
Pascal	B-Application
:	O
</s>
<s>
While	O
all	O
versions	O
of	O
Turbo	B-Application
Pascal	B-Application
could	O
include	O
inline	O
machine	B-Language
code	I-Language
,	O
starting	O
with	O
version	O
6	O
it	O
was	O
possible	O
to	O
integrate	O
assembly	B-Language
language	I-Language
within	O
Pascal	B-Application
source	O
code	O
.	O
</s>
<s>
Support	O
for	O
the	O
various	O
x86	B-Device
memory	I-Device
models	I-Device
was	O
provided	O
by	O
inline	O
assembly	O
,	O
compiler	B-Language
options	O
,	O
and	O
language	O
extensions	O
such	O
as	O
the	O
"	O
absolute	O
"	O
keyword	O
.	O
</s>
<s>
The	O
Turbo	B-Application
Assembler	I-Application
,	O
TASM	B-Application
,	O
a	O
standard	O
x86	B-Operating_System
assembler	B-Language
independent	O
of	O
TP	O
,	O
and	O
source-compatible	O
with	O
the	O
widely	O
used	O
Microsoft	B-Application
Macro	I-Application
Assembler	I-Application
MASM	B-Application
,	O
was	O
supplied	O
with	O
the	O
enhanced	O
"	O
Borland	O
Pascal	B-Application
"	O
versions	O
.	O
</s>
<s>
The	O
same	O
company	O
produced	O
Turbo	B-Application
Analyst	O
and	O
Overlay	B-General_Concept
Manager	I-General_Concept
for	O
Turbo	B-Application
Pascal	B-Application
.	O
</s>
<s>
T-Debug	O
was	O
later	O
updated	O
for	O
Turbo	B-Application
Pascal	B-Application
4	O
,	O
but	O
discontinued	O
with	O
the	O
release	O
of	O
Borland	O
's	O
Turbo	B-Application
Debugger	I-Application
(	O
TD	O
)	O
,	O
which	O
also	O
allowed	O
some	O
hardware	O
intervention	O
on	O
computers	O
equipped	O
with	O
the	O
new	O
80386	B-General_Concept
processor	O
.	O
</s>
<s>
TD	O
was	O
usually	O
supplied	O
in	O
conjunction	O
with	O
the	O
Turbo	B-Application
Assembler	I-Application
and	O
the	O
Turbo	B-Application
Profiler	I-Application
,	O
a	O
code	O
profiler	O
that	O
reported	O
on	O
the	O
time	O
spent	O
in	O
each	O
part	O
of	O
the	O
program	O
to	O
assist	O
program	O
optimisation	O
by	O
finding	O
bottlenecks	O
.	O
</s>
<s>
The	O
books	O
included	O
with	O
Borland	O
Pascal	B-Application
had	O
detailed	O
descriptions	O
of	O
the	O
Intel	O
assembler	B-Language
language	I-Language
,	O
including	O
the	O
number	O
of	O
clock	O
cycles	O
required	O
by	O
each	O
instruction	O
.	O
</s>
<s>
A	O
development	O
system	O
based	O
on	O
ISO	O
standard	O
Pascal	B-Application
requires	O
implementation-specific	O
extensions	O
for	O
the	O
development	O
of	O
real-world	O
applications	O
on	O
the	O
platforms	O
they	O
target	O
.	O
</s>
<s>
Standard	O
Pascal	B-Application
is	O
designed	O
to	O
be	O
platform-independent	O
,	O
so	O
prescribes	O
no	O
low-level	B-Language
access	O
to	O
hardware	O
-	O
or	O
operating	O
system-dependent	O
facilities	O
.	O
</s>
<s>
Standard	O
Pascal	B-Application
also	O
does	O
not	O
prescribe	O
how	O
a	O
large	O
program	O
should	O
be	O
split	O
into	O
separate	O
compilation	B-Language
units	B-Architecture
.	O
</s>
<s>
From	O
version	O
4	O
,	O
Turbo	B-Application
Pascal	B-Application
adopted	O
the	O
concept	O
of	O
units	B-Architecture
from	O
UCSD	B-Language
Pascal	I-Language
.	O
</s>
<s>
Units	B-Architecture
were	O
used	O
as	O
external	O
function	O
libraries	O
,	O
like	O
the	O
object	O
files	O
used	O
in	O
other	O
languages	O
such	O
as	O
FORTRAN	O
or	O
C	B-Language
.	O
</s>
<s>
For	O
example	O
,	O
the	O
line	O
uses	O
crt	O
;	O
in	O
a	O
program	O
included	O
the	O
unit	O
called	O
crt	O
;	O
the	O
uses	O
is	O
the	O
mechanism	O
for	O
using	O
other	O
compilation	B-Language
units	B-Architecture
.	O
</s>
<s>
This	O
is	O
similar	O
to	O
the	O
public	O
and	O
private	O
keywords	O
in	O
other	O
languages	O
such	O
as	O
C++	B-Language
and	O
Java	B-Language
.	O
</s>
<s>
Units	B-Architecture
in	O
Borland	O
's	O
Pascal	B-Application
were	O
similar	O
to	O
Modula-2	B-Language
'	O
s	O
separate	O
compilation	B-Language
system	O
.	O
</s>
<s>
In	O
1987	O
,	O
when	O
Turbo	B-Application
Pascal	B-Application
4	O
was	O
released	O
,	O
Modula-2	B-Language
was	O
making	O
inroads	O
as	O
an	O
educational	O
language	O
which	O
could	O
replace	O
Pascal	B-Application
.	O
</s>
<s>
Borland	O
,	O
in	O
fact	O
,	O
had	O
a	O
Turbo	B-Application
Modula-2	B-Language
compiler	B-Language
,	O
but	O
only	O
released	O
it	O
on	O
CP/M	B-Application
(	O
its	O
user	O
interface	O
was	O
almost	O
identical	O
to	O
that	O
of	O
Turbo	B-Application
Pascal	B-Application
1	O
–	O
3	O
)	O
with	O
little	O
marketing	O
.	O
</s>
<s>
A	O
much	O
improved	O
DOS	B-Device
version	O
was	O
developed	O
,	O
but	O
as	O
Borland	O
was	O
unwilling	O
to	O
publish	O
the	O
results	O
itself	O
,	O
the	O
authors	O
including	O
Niels	O
Jensen	O
bought	O
the	O
rights	O
and	O
formed	O
Jensen	B-Language
&	I-Language
Partners	I-Language
International	I-Language
to	O
publish	O
it	O
as	O
JPI	O
TopSpeed	O
Modula-2	B-Language
.	O
</s>
<s>
Instead	O
Borland	O
chose	O
to	O
implement	O
separate	O
compilation	B-Language
in	O
their	O
established	O
Pascal	B-Application
product	O
.	O
</s>
<s>
Separate	O
compilation	B-Language
was	O
not	O
part	O
of	O
the	O
standard	O
Pascal	B-Application
language	I-Application
,	O
but	O
was	O
already	O
available	O
in	O
UCSD	B-Language
Pascal	I-Language
,	O
which	O
was	O
very	O
popular	O
on	O
8-bit	O
machines	O
.	O
</s>
<s>
Turbo	B-Application
Pascal	B-Application
syntax	O
for	O
units	B-Architecture
appears	O
to	O
have	O
been	O
borrowed	O
from	O
UCSD	B-Language
Pascal	I-Language
.	O
</s>
<s>
Earlier	O
versions	O
of	O
Turbo	B-Application
Pascal	B-Application
,	O
designed	O
for	O
computers	O
with	O
limited	O
resources	O
,	O
supported	O
a	O
"	O
chain	O
and	O
execute	O
"	O
system	O
of	O
dynamic	O
linking	B-Application
for	O
separately	O
compiled	B-Language
objects	O
,	O
similar	O
to	O
the	O
system	O
widely	O
used	O
in	O
BASIC	O
.	O
</s>
<s>
Also	O
,	O
the	O
language	O
had	O
a	O
statement	O
to	O
include	O
separate	O
source	O
code	O
in	O
a	O
program	O
when	O
necessary	O
,	O
and	O
overlaying	O
was	O
supported	O
from	O
TP3	O
,	O
but	O
,	O
as	O
with	O
overlays	B-General_Concept
,	O
chained	O
objects	O
had	O
to	O
fit	O
into	O
the	O
original	O
(	O
limited	O
)	O
program	O
memory	O
space	O
.	O
</s>
<s>
As	O
computing	O
and	O
storage	O
facilities	O
advanced	O
,	O
the	O
ability	O
to	O
generate	O
large	O
EXE	O
files	O
was	O
added	O
to	O
Turbo	B-Application
Pascal	B-Application
,	O
with	O
the	O
ability	O
to	O
statically	O
link	O
and	O
collectively	O
load	O
separately	O
compiled	B-Language
objects	O
.	O
</s>
<s>
The	O
.TPU	O
files	O
output	O
by	O
compiling	B-Language
a	O
Turbo	B-Application
Pascal	B-Application
unit	O
are	O
tightly	O
linked	O
to	O
the	O
internal	O
structures	O
of	O
the	O
compiler	B-Language
,	O
rather	O
than	O
standard	O
.OBJ	O
linkable	O
files	O
.	O
</s>
<s>
This	O
improved	O
compilation	B-Language
and	O
linkage	O
times	O
,	O
but	O
meant	O
that	O
.TPU	O
files	O
could	O
not	O
be	O
linked	O
with	O
the	O
output	O
of	O
other	O
languages	O
or	O
even	O
used	O
with	O
different	O
releases	O
of	O
Turbo	B-Application
Pascal	B-Application
unless	O
recompiled	B-Language
from	O
source	O
.	O
</s>
<s>
From	O
version	O
5.5	O
some	O
object-oriented	B-Language
programming	I-Language
features	O
were	O
introduced	O
:	O
classes	O
,	O
inheritance	O
,	O
constructors	O
and	O
destructors	O
.	O
</s>
<s>
The	O
IDE	O
was	O
already	O
augmented	O
with	O
an	O
object	O
browser	O
interface	O
showing	O
relations	O
between	O
objects	O
and	O
methods	O
and	O
allowing	O
programmers	O
to	O
navigate	O
the	O
modules	B-Architecture
easily	O
.	O
</s>
<s>
Borland	O
called	O
its	O
language	O
Object	B-Language
Pascal	I-Language
,	O
which	O
was	O
greatly	O
extended	O
to	O
become	O
the	O
language	O
underlying	O
Delphi	B-Language
(	O
which	O
has	O
two	O
separate	O
OOP	O
systems	O
)	O
.	O
</s>
<s>
The	O
name	O
"	O
Object	B-Language
Pascal	I-Language
"	O
originated	O
with	O
the	O
Pascal	B-Application
extensions	O
developed	O
by	O
Apple	O
Computer	O
to	O
program	O
its	O
Lisa	B-Device
and	O
Macintosh	B-Device
computers	O
.	O
</s>
<s>
Pascal	B-Application
originator	O
Niklaus	O
Wirth	O
consulted	O
in	O
developing	O
these	O
extensions	O
,	O
which	O
built	O
upon	O
the	O
record	O
type	O
already	O
present	O
in	O
Pascal	B-Application
.	O
</s>
<s>
Several	O
versions	O
of	O
Turbo	B-Application
Pascal	B-Application
,	O
including	O
the	O
latest	O
version	O
7	O
,	O
include	O
a	O
CRT	O
unit	O
used	O
by	O
many	O
fullscreen	O
text	O
mode	O
applications	O
.	O
</s>
<s>
This	O
unit	O
contains	O
code	O
in	O
its	O
initialization	O
section	O
to	O
determine	O
the	O
CPU	O
speed	O
and	O
calibrate	B-General_Concept
delay	O
loops	O
.	O
</s>
<s>
This	O
code	O
fails	O
on	O
processors	O
with	O
a	O
speed	O
greater	O
than	O
about	O
200MHz	O
and	O
aborts	O
immediately	O
with	O
a	O
"	O
Runtime	B-Error_Name
Error	I-Error_Name
200	I-Error_Name
"	O
message	O
.	O
</s>
<s>
When	O
Turbo	B-Application
Pascal	B-Application
was	O
developed	O
it	O
ran	O
on	O
machines	O
with	O
CPUs	O
running	O
at	O
2.5	O
to	O
8MHz	O
,	O
and	O
little	O
thought	O
was	O
given	O
to	O
the	O
possibility	O
of	O
vastly	O
higher	O
speeds	O
,	O
so	O
from	O
about	O
200MHz	O
enough	O
iterations	O
can	O
be	O
run	O
to	O
overflow	O
the	O
16-bit	O
counter	O
.	O
</s>
<s>
Programs	O
subject	O
to	O
this	O
error	O
can	O
be	O
recompiled	B-Language
from	O
source	O
code	O
with	O
a	O
compiler	B-Language
patched	O
to	O
eliminate	O
the	O
error	O
(	O
using	O
a	O
TURBO.TPL	O
itself	O
compiled	B-Language
with	O
a	O
corrected	O
CRT	O
unit	O
)	O
or	O
,	O
if	O
source	O
code	O
is	O
not	O
available	O
,	O
executables	O
can	O
be	O
patched	O
by	O
a	O
tool	O
named	O
TPPATCH	O
or	O
equivalent	O
,	O
or	O
by	O
loading	O
a	O
terminate-and-stay-resident	O
program	O
before	O
running	O
the	O
faulty	O
program	O
.	O
</s>
<s>
There	O
are	O
also	O
patches	O
to	O
the	O
TP7	O
compiler	B-Language
itself	O
,	O
thus	O
if	O
the	O
Pascal	B-Application
source	O
is	O
available	O
,	O
a	O
new	O
compilation	B-Language
's	O
code	O
will	O
work	O
without	O
the	O
compiled	B-Language
code	O
having	O
to	O
be	O
patched	O
.	O
</s>
<s>
There	O
were	O
several	O
floating	B-Algorithm
point	I-Algorithm
types	I-Algorithm
,	O
including	O
single	O
(	O
the	O
4-byte	O
[	O
IEEE	O
754 ]	O
representation	O
)	O
double	O
(	O
the	O
8-byte	O
IEEE	O
754	O
representation	O
)	O
,	O
extended	O
(	O
a	O
10-byte	O
IEEE	O
754	O
representation	O
used	O
mostly	O
internally	O
by	O
numeric	B-Algorithm
coprocessors	B-General_Concept
)	O
and	O
Real	O
(	O
a	O
6-byte	O
representation	O
)	O
.	O
</s>
<s>
Most	O
PCs	O
of	O
the	O
era	O
did	O
not	O
have	O
a	O
floating	B-Algorithm
point	I-Algorithm
coprocessor	B-General_Concept
so	O
all	O
FP	O
had	O
to	O
be	O
done	O
in	O
software	O
.	O
</s>
<s>
Borland	O
's	O
own	O
FP	O
algorithms	O
on	O
Real	O
were	O
quicker	O
than	O
using	O
the	O
other	O
types	O
,	O
though	O
its	O
library	O
also	O
emulated	B-Application
the	O
other	O
types	O
in	O
software	O
.	O
</s>
<s>
Version	O
1	O
was	O
a	O
basic	O
all-in-one	O
system	O
,	O
working	O
in	O
memory	O
and	O
producing	O
.COM	O
executable	O
files	O
for	O
DOS	B-Device
and	O
CP/M	B-Application
,	O
and	O
equivalent	O
.CMD	O
executables	O
for	O
CP/M	B-Operating_System
-86	I-Operating_System
(	O
totally	O
different	O
from	O
.CMD	O
batch	O
files	O
later	O
used	O
in	O
32-bit	O
Microsoft	B-Application
Windows	I-Application
)	O
.	O
</s>
<s>
Source	O
code	O
files	O
were	O
limited	O
to	O
64KB	O
to	O
simplify	O
the	O
IDE	O
,	O
and	O
DOS	B-Device
.COM	O
files	O
were	O
limited	O
to	O
64KB	O
each	O
of	O
code	O
,	O
stack	O
and	O
global	O
(	O
static	O
)	O
variables	O
.	O
</s>
<s>
There	O
were	O
different	O
versions	O
of	O
Turbo	B-Application
Pascal	B-Application
for	O
computers	O
running	O
DOS	B-Device
,	O
CP/M	B-Application
,	O
or	O
CP/M	B-Operating_System
-86	I-Operating_System
with	O
64KB	O
of	O
memory	O
and	O
at	O
least	O
one	O
floppy	O
disk	O
drive	O
.	O
</s>
<s>
The	O
CP/M	B-Application
version	O
could	O
run	O
on	O
the	O
many	O
CP/M	B-Application
machines	O
of	O
the	O
time	O
with	O
Z80	B-General_Concept
processors	O
,	O
or	O
an	O
Apple	B-Device
II	I-Device
with	O
Z80	B-General_Concept
card	O
.	O
</s>
<s>
The	O
DOS	B-Device
and	O
CP/M	B-Operating_System
-86	I-Operating_System
versions	O
ran	O
on	O
the	O
many	O
8086	B-General_Concept
and	O
8088	B-Device
machines	O
which	O
became	O
available	O
,	O
including	O
the	O
IBM	O
PC	O
.	O
</s>
<s>
The	O
installer	O
,	O
lister	O
,	O
and	O
compiler	B-Language
with	O
its	O
IDE	O
,	O
and	O
the	O
source	O
code	O
for	O
a	O
simple	O
spreadsheet	O
program	O
called	O
MicroCalc	O
written	O
by	O
Philippe	O
Kahn	O
as	O
a	O
demonstration	O
,	O
would	O
fit	O
on	O
a	O
single	O
floppy	O
disc	O
.	O
</s>
<s>
A	O
disc	O
copy	O
without	O
MicroCalc	O
would	O
accommodate	O
the	O
source	O
code	O
and	O
compiled	B-Language
executable	O
of	O
a	O
reasonable-sized	O
program	O
—	O
as	O
it	O
was	O
common	O
at	O
the	O
time	O
for	O
users	O
to	O
have	O
only	O
a	O
single	O
floppy	O
drive	O
as	O
mass	B-Device
storage	I-Device
,	O
it	O
was	O
a	O
great	O
convenience	O
to	O
be	O
able	O
to	O
fit	O
both	O
the	O
compiler	B-Language
and	O
the	O
program	O
being	O
written	O
on	O
a	O
single	O
disc	O
,	O
avoiding	O
endless	O
disc	O
swapping	O
.	O
</s>
<s>
The	O
architecture	B-General_Concept
of	O
the	O
various	O
machines	O
running	O
MS-DOS	O
additionally	O
limited	O
the	O
maximum	O
user	O
memory	O
to	O
under	O
1MB	O
(	O
e.g.	O
,	O
machines	O
hardware-compatible	O
with	O
the	O
IBM	O
PC	O
were	O
limited	O
to	O
640KB	O
)	O
.	O
</s>
<s>
The	O
Turbo	B-Application
Pascal	B-Application
IDE	O
was	O
very	O
advanced	O
for	O
its	O
day	O
.	O
</s>
<s>
It	O
was	O
able	O
to	O
perform	O
well	O
and	O
compile	B-Language
very	O
fast	O
with	O
the	O
amount	O
of	O
RAM	O
on	O
a	O
typical	O
home	O
computer	O
.	O
</s>
<s>
Early	O
versions	O
of	O
the	O
editor	O
used	O
WordStar	B-Application
key	O
functions	O
,	O
which	O
was	O
the	O
de	O
facto	O
standard	O
at	O
the	O
time	O
.	O
</s>
<s>
In	O
addition	O
to	O
standard	O
executable	O
programs	O
,	O
the	O
compiler	B-Language
could	O
generate	O
terminate-and-stay-resident	O
(	O
TSR	O
)	O
programs	O
,	O
small	O
utilities	O
that	O
stayed	O
in	O
memory	O
and	O
let	O
the	O
computer	O
do	O
other	O
tasks	O
—	O
running	O
several	O
programs	O
at	O
the	O
same	O
time	O
,	O
multitasking	B-Operating_System
,	O
was	O
not	O
otherwise	O
available	O
.	O
</s>
<s>
Borland	O
itself	O
produced	O
a	O
small	O
application	O
suite	O
called	O
Sidekick	B-Application
that	O
was	O
a	O
TSR	O
letting	O
the	O
user	O
keep	O
a	O
diary	O
,	O
notes	O
,	O
and	O
so	O
forth	O
.	O
</s>
<s>
Version	O
2	O
,	O
released	O
a	O
few	O
months	O
later	O
on	O
17	O
April	O
1984	O
,	O
was	O
an	O
incremental	O
improvement	O
to	O
the	O
original	O
Turbo	B-Application
Pascal	B-Application
,	O
to	O
the	O
point	O
that	O
the	O
reference	O
manual	O
was	O
at	O
first	O
identical	O
to	O
version	O
1	O
's	O
,	O
down	O
to	O
having	O
1983	O
as	O
the	O
copyright	O
date	O
on	O
some	O
of	O
the	O
compiler	B-Language
's	O
sample	O
output	O
,	O
but	O
had	O
a	O
separate	O
"	O
Addendum	O
to	O
Reference	O
Manual	O
:	O
Version	O
2.0	O
and	O
8087	B-Device
Supplement	O
"	O
manual	O
with	O
separate	O
page	O
numbering	O
.	O
</s>
<s>
Additions	O
included	O
an	O
overlay	B-General_Concept
system	I-General_Concept
,	O
where	O
separate	O
overlay	B-General_Concept
procedures	I-General_Concept
would	O
be	O
automatically	O
swapped	O
from	O
disk	O
into	O
a	O
reserved	O
space	O
in	O
memory	O
.	O
</s>
<s>
This	O
memory	O
was	O
part	O
of	O
the	O
64kB	O
RAM	O
used	O
by	O
the	O
program	O
's	O
code	O
,	O
and	O
was	O
automatically	O
the	O
size	O
of	O
the	O
largest	O
overlay	B-General_Concept
procedure	I-General_Concept
.	O
</s>
<s>
Overlay	B-General_Concept
procedures	I-General_Concept
could	O
include	O
overlay	B-General_Concept
sections	O
themselves	O
,	O
but	O
unless	O
a	O
RAM	O
disk	O
was	O
used	O
,	O
the	O
resulting	O
disk	O
swapping	O
could	O
be	O
slow	O
.	O
</s>
<s>
2.0	O
also	O
added	O
the	O
Dispose	O
procedure	O
to	O
manage	O
the	O
heap	O
,	O
allowing	O
individual	O
dynamic	O
variables	O
to	O
be	O
freed	O
,	O
as	O
an	O
alternative	O
to	O
the	O
more	O
primitive	O
'	O
Mark/Release	O
'	O
system	O
and	O
increased	O
compatibility	O
with	O
WordStar	B-Application
commands	O
plus	O
use	O
of	O
the	O
numeric	B-Algorithm
keypad	O
on	O
the	O
IBM	O
PC	O
and	O
compatibles	O
.	O
</s>
<s>
Such	O
PCs	O
also	O
had	O
new	O
text	O
window	O
and	O
CGA	B-Device
graphics	I-Device
mode	O
commands	O
as	O
well	O
as	O
being	O
able	O
to	O
use	O
the	O
PC	O
's	O
speaker	O
for	O
tones	O
.	O
</s>
<s>
Finally	O
,	O
DOS	B-Device
and	O
CP/M	B-Operating_System
-86	I-Operating_System
machines	O
with	O
an	O
8087	B-Device
maths	O
coprocessor	B-General_Concept
(	O
or	O
later	O
compatible	O
)	O
had	O
an	O
alternative	O
TURBO-87	O
compiler	B-Language
available	O
to	O
purchase	O
.	O
</s>
<s>
It	O
supported	O
the	O
8087	B-Device
's	O
long	O
real	O
data	O
types	O
with	O
a	O
range	O
of	O
1.67E-307	O
to	O
1.67E	O
+308	O
to	O
14	O
significant	O
figure	O
precision	O
but	O
with	O
a	O
much	O
greater	O
processing	O
speed	O
.	O
</s>
<s>
The	O
manual	O
notes	O
that	O
although	O
source	O
code	O
for	O
the	O
Turbo	B-Application
Pascal	B-Application
's	O
software	O
real	O
data	O
types	O
offering	O
a	O
range	O
of	O
1E-63	O
to	O
1E+63	O
to	O
11	O
significant	O
figures	O
,	O
these	O
were	O
incompatible	O
at	O
a	O
binary	O
level	O
:	O
as	O
well	O
as	O
having	O
a	O
much	O
larger	O
range	O
,	O
the	O
software	O
reals	O
took	O
six	O
bytes	O
in	O
memory	O
and	O
the	O
8087	B-Device
ones	O
were	O
eight	O
.	O
</s>
<s>
Like	O
version	O
1	O
,	O
version	O
2	O
for	O
CP/M	B-Application
-80	I-Application
only	O
ran	O
on	O
Z80-based	O
CP/M	B-Application
machines	O
.	O
</s>
<s>
Turbo	B-Application
Pascal	B-Application
3	O
supported	O
turtle	B-Application
graphics	I-Application
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
default	O
software	O
real	O
numbers	O
and	O
8087	B-Device
edition	O
of	O
the	O
compiler	B-Language
,	O
Borland	O
also	O
offered	O
a	O
BCD	O
version	O
(	O
TURBOBCD	O
)	O
which	O
offered	O
the	O
same	O
numeric	B-Algorithm
range	O
as	O
real	O
data	O
types	O
but	O
to	O
18	O
significant	O
figures	O
.	O
</s>
<s>
Released	O
on	O
20	O
November	O
1987	O
,	O
Version	O
4	O
was	O
a	O
total	O
rewrite	O
,	O
with	O
both	O
look	B-Application
and	I-Application
feel	I-Application
and	O
internal	O
operation	O
much	O
changed	O
.	O
</s>
<s>
The	O
compiler	B-Language
generated	O
executables	O
in	O
.EXE	O
format	O
under	O
DOS	B-Device
,	O
rather	O
than	O
the	O
simpler	O
but	O
more	O
restricted	O
.COM	O
executables	O
.	O
</s>
<s>
The	O
by-then-obsolete	O
CP/M	B-Application
and	O
CP/M	B-Operating_System
-86	I-Operating_System
operating	O
system	O
versions	O
were	O
dropped	O
when	O
Turbo	B-Application
Pascal	B-Application
was	O
rewritten	O
.	O
</s>
<s>
Version	O
4	O
introduced	O
units	B-Architecture
,	O
and	O
a	O
full-screen	O
text	O
user	O
interface	O
with	O
pull-down	O
menus	O
;	O
earlier	O
versions	O
had	O
a	O
text-based	O
menu	O
screen	O
and	O
a	O
separate	O
full-screen	O
editor	O
.	O
</s>
<s>
(	O
Microsoft	B-Application
Windows	I-Application
was	O
still	O
very	O
experimental	O
when	O
the	O
first	O
version	O
was	O
released	O
,	O
and	O
even	O
mice	B-Device
were	O
rare	O
.	O
)	O
</s>
<s>
An	O
add	O
on	O
package	O
,	O
the	O
Turbo	B-Application
Pascal	B-Application
Graphix	O
Toolbox	O
,	O
was	O
available	O
for	O
Turbo	B-Application
Pascal	B-Application
V4	O
.	O
</s>
<s>
Colour	O
displays	O
were	O
replacing	O
monochrome	O
;	O
Turbo	B-Application
Pascal	B-Application
version	O
5.0	O
,	O
released	O
24	O
August	O
24	O
,	O
1988	O
,	O
introduced	O
blue	O
as	O
the	O
editor	O
's	O
default	O
background	O
color	O
,	O
used	O
by	O
Borland	O
's	O
DOS	B-Device
compilers	B-Language
until	O
the	O
end	O
of	O
this	O
product	O
line	O
in	O
the	O
mid-1990s	O
.	O
</s>
<s>
Later	O
versions	O
came	O
in	O
two	O
packages	O
with	O
the	O
same	O
version	O
number	O
:	O
a	O
less	O
expensive	O
"	O
Turbo	B-Application
"	O
package	O
,	O
and	O
a	O
"	O
Borland	O
"	O
package	O
with	O
enhanced	O
capabilities	O
and	O
more	O
add-ons	O
.	O
</s>
<s>
This	O
version	O
,	O
released	O
on	O
2	O
May	O
1989	O
,	O
introduced	O
object-oriented	B-Language
programming	I-Language
features	O
for	O
the	O
Pascal	B-Application
language	I-Application
,	O
including	O
concept	O
of	O
classes	O
,	O
static	O
and	O
dynamic	O
objects	O
,	O
constructors	O
and	O
destructors	O
and	O
inheritance	O
,	O
which	O
would	O
become	O
the	O
basis	O
for	O
the	O
Object	B-Language
Pascal	I-Language
found	O
in	O
Borland	B-Language
Delphi	I-Language
.	O
</s>
<s>
The	O
IDE	O
uses	O
the	O
default	O
blue	O
colour	O
scheme	O
that	O
would	O
also	O
be	O
used	O
on	O
later	O
Borland	O
Turbo	B-Application
products	O
.	O
</s>
<s>
Changes	O
from	O
5.5	O
include	O
:	O
the	O
addition	O
of	O
inline	O
assembly	O
,	O
the	O
addition	O
of	O
the	O
Turbo	B-Application
Vision	I-Application
library	O
,	O
mouse	O
support	O
,	O
clipboard	O
for	O
text	O
manipulations	O
,	O
multiple	O
document	O
interface	O
supporting	O
up	O
to	O
nine	O
edit	O
windows	O
,	O
and	O
debugger	O
support	O
for	O
breakpoints	O
and	O
watches	O
.	O
</s>
<s>
Changes	O
from	O
6.0	O
include	O
support	O
for	O
the	O
creation	O
of	O
DOS	B-Device
and	O
Windows	O
executables	O
and	O
Windows	O
DLLs	O
,	O
and	O
syntax	O
highlighting	O
.	O
</s>
<s>
Two	O
versions	O
named	O
"	O
Turbo	B-Application
Pascal	B-Application
for	O
Windows	O
"	O
(	O
TPW	O
)	O
,	O
for	O
Windows	B-Application
3.x	I-Application
,	O
were	O
released	O
:	O
TPW	O
1.0	O
,	O
based	O
on	O
Turbo	B-Application
Pascal	B-Application
6	O
but	O
released	O
about	O
2	O
years	O
later	O
,	O
and	O
1.5	O
,	O
released	O
after	O
Turbo	B-Application
Pascal	B-Application
7	O
;	O
they	O
were	O
succeeded	O
by	O
Borland	O
Pascal	B-Application
7	O
,	O
which	O
had	O
Windows	O
support	O
.	O
</s>
<s>
The	O
Windows	O
compiler	B-Language
in	O
Pascal	B-Application
7	O
was	O
titled	O
Borland	O
Pascal	B-Application
for	O
Windows	O
.	O
</s>
<s>
Both	O
versions	O
built	O
Windows-compatible	O
programs	O
,	O
and	O
featured	O
a	O
Windows-based	O
IDE	O
,	O
as	O
opposed	O
to	O
the	O
DOS-based	O
IDE	O
in	O
Turbo	B-Application
Pascal	B-Application
.	O
</s>
<s>
The	O
IDE	O
and	O
editor	O
commands	O
conformed	O
to	O
the	O
Microsoft	B-Application
Windows	I-Application
user	O
interface	O
guidelines	O
instead	O
of	O
the	O
classic	O
TP	O
user	O
interface	O
.	O
</s>
<s>
The	O
support	O
for	O
Windows	O
programs	O
required	O
the	O
ObjectWindows	B-Language
library	I-Language
,	O
similar	O
but	O
not	O
identical	O
to	O
that	O
for	O
the	O
first	O
release	O
of	O
Borland	B-Application
C++	I-Application
,	O
and	O
radically	O
different	O
from	O
the	O
earlier	O
DOS	B-Device
Turbo	B-Application
Vision	I-Application
environment	O
.	O
</s>
<s>
Turbo	B-Application
Pascal	B-Application
was	O
superseded	O
for	O
the	O
Windows	O
platform	O
by	O
Delphi	B-Language
;	O
the	O
Delphi	B-Language
compiler	B-Language
can	O
produce	O
console	O
programs	O
and	O
graphical	B-Application
user	I-Application
interface	I-Application
(	O
GUI	B-Application
)	O
applications	O
,	O
so	O
that	O
using	O
Turbo	B-Application
and	O
Borland	O
Pascal	B-Application
became	O
unnecessary	O
.	O
</s>
<s>
Borland	O
released	O
Turbo	B-Application
Pascal	B-Application
for	O
Macintosh	B-Device
in	O
1986	O
.	O
</s>
<s>
Much	O
like	O
versions	O
1	O
to	O
3	O
for	O
other	O
operating	O
systems	O
,	O
it	O
was	O
written	O
in	O
compact	O
assembly	B-Language
language	I-Language
and	O
had	O
a	O
very	O
powerful	O
IDE	O
,	O
but	O
no	O
good	O
debugger	O
.	O
</s>
<s>
Borland	O
did	O
not	O
support	O
this	O
product	O
very	O
well	O
,	O
although	O
they	O
issued	O
a	O
version	O
1.1	O
,	O
patched	O
to	O
run	O
on	O
the	O
32-bit	O
Macintosh	B-Device
II	I-Device
.	O
</s>
<s>
Macintosh	B-Device
support	O
was	O
dropped	O
soon	O
after	O
.	O
</s>
<s>
Borland	O
released	O
several	O
versions	O
of	O
Turbo	B-Application
Pascal	B-Application
as	O
freeware	B-License
after	O
they	O
became	O
"	O
antique	O
software	O
"	O
(	O
abandonware	O
)	O
,	O
with	O
1.0	O
for	O
DOS	B-Device
on	O
1	O
February	O
2000	O
,	O
3.02	O
on	O
10	O
February	O
2000	O
,	O
5.5	O
on	O
21	O
February	O
2002	O
,	O
Turbo	B-Application
Pascal	B-Application
7.01	O
French	O
version	O
in	O
year	O
2000	O
.	O
</s>
<s>
Borland	O
Pascal	B-Application
is	O
still	O
taught	O
in	O
some	O
countries	O
at	O
secondary	O
,	O
sixth	O
form	O
and	O
university	O
levels	O
.	O
</s>
<s>
Today	O
it	O
continues	O
to	O
be	O
taught	O
in	O
some	O
universities	O
around	O
the	O
world	O
as	O
an	O
introduction	O
to	O
computer	O
programming	O
,	O
usually	O
advancing	O
to	O
C	B-Language
or	O
Java	B-Language
or	O
both	O
.	O
</s>
<s>
Some	O
lecturers	O
prefer	O
to	O
use	O
Borland	O
Pascal	B-Application
7	O
or	O
Turbo	B-Application
Pascal	B-Application
5.5	O
because	O
of	O
its	O
simplicity	O
in	O
comparison	O
to	O
more	O
modern	O
IDEs	O
such	O
as	O
Microsoft	B-Application
Visual	I-Application
Studio	I-Application
or	O
Borland	O
JBuilder	B-Application
,	O
so	O
it	O
introduces	O
students	O
unfamiliar	O
with	O
computing	O
to	O
common	O
tasks	O
such	O
as	O
using	O
the	O
keyboard	O
and	O
keyboard	O
shortcuts	O
(	O
TP	O
5.5	O
has	O
no	O
mouse	O
support	O
)	O
,	O
familiarises	O
them	O
with	O
DOS	B-Device
commands	O
(	O
which	O
are	O
largely	O
the	O
same	O
as	O
those	O
of	O
Microsoft	B-Application
Windows	I-Application
's	O
command	O
prompt	O
)	O
,	O
and	O
lets	O
them	O
write	O
programs	O
without	O
spending	O
a	O
lot	O
of	O
effort	O
on	O
getting	O
the	O
environment	O
to	O
work	O
.	O
</s>
