<s>
ZTerm	B-Operating_System
is	O
a	O
shareware	B-License
terminal	B-Application
emulator	I-Application
for	O
Macintosh	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
.	O
</s>
<s>
It	O
was	O
introduced	O
in	O
1992	O
for	O
System	B-Operating_System
7	I-Operating_System
and	O
has	O
been	O
updated	O
to	O
run	O
on	O
macOS	B-Application
.	O
</s>
<s>
Its	O
name	O
comes	O
from	O
its	O
use	O
of	O
the	O
ZModem	B-Device
file	B-Protocol
transfer	I-Protocol
protocol	I-Protocol
,	O
which	O
ZTerm	B-Operating_System
implemented	O
in	O
a	O
particularly	O
high-performance	O
package	O
.	O
</s>
<s>
In	O
contrast	O
to	O
the	O
built-in	O
macOS	B-Application
Terminal	B-Application
app	O
,	O
which	O
only	O
communicates	O
with	O
other	O
programs	O
,	O
ZTerm	B-Operating_System
only	O
communicates	O
with	O
hardware	O
serial	B-Protocol
ports	I-Protocol
.	O
</s>
<s>
When	O
it	O
was	O
first	O
introduced	O
in	O
1992	O
,	O
ZTerm	B-Operating_System
was	O
one	O
of	O
the	O
highest	O
performing	O
terminal	B-Application
emulators	I-Application
on	O
the	O
Mac	O
,	O
both	O
in	O
terms	O
of	O
basic	O
text	O
display	O
as	O
well	O
as	O
file	O
transfer	O
performance	O
.	O
</s>
<s>
ZTerm	B-Operating_System
was	O
widely	O
regarded	O
as	O
the	O
best	O
terminal	B-Application
program	I-Application
on	O
the	O
Mac	O
.	O
</s>
<s>
These	O
features	O
were	O
not	O
universally	O
supported	O
in	O
Mac	O
hardware	O
,	O
so	O
many	O
terminal	B-Application
emulators	I-Application
simply	O
did	O
n't	O
bother	O
to	O
implement	O
them	O
at	O
all	O
.	O
</s>
<s>
ZTerm	B-Operating_System
supported	O
one	O
of	O
the	O
widest	O
variety	O
of	O
file	B-Protocol
transfer	I-Protocol
protocols	I-Protocol
available	O
on	O
the	O
Mac	O
,	O
including	O
a	O
full	O
implementation	O
of	O
ZModem	B-Device
,	O
YModem	B-Protocol
,	O
YModem-G	B-Protocol
,	O
almost	O
all	O
of	O
the	O
common	O
varieties	O
of	O
XModem	B-Protocol
with	O
different	O
packet	O
sizes	O
and	O
error	O
correction	O
methods	O
,	O
and	O
even	O
the	O
rare	O
but	O
useful	O
B	B-Protocol
protocol	I-Protocol
(	O
CIS-B	O
)	O
for	O
use	O
on	O
Compuserve	O
.	O
</s>
<s>
ZTerm	B-Operating_System
also	O
supported	O
auto-starting	O
transfers	O
from	O
ZModem	B-Device
and	O
CIS-B	O
,	O
where	O
commands	O
from	O
the	O
host	O
triggered	O
transfers	O
from	O
the	O
client	O
.	O
</s>
<s>
Additionally	O
,	O
ZTerm	B-Operating_System
included	O
a	O
complete	O
PC	O
graphics	O
character	O
set	O
and	O
ANSI	O
escape	O
codes	O
,	O
including	O
color	O
.	O
</s>
<s>
This	O
made	O
it	O
one	O
of	O
the	O
few	O
terminals	O
on	O
the	O
Mac	O
that	O
properly	O
displayed	O
ASCII	O
art	O
,	O
and	O
allowed	O
full	O
interaction	O
with	O
PC-based	O
bulletin	B-Application
board	I-Application
systems	I-Application
(	O
BBS	O
)	O
that	O
used	O
these	O
features	O
extensively	O
.	O
</s>
<s>
ZTerm	B-Operating_System
added	O
the	O
ability	O
to	O
use	O
the	O
mouse	O
to	O
position	O
the	O
cursor	O
,	O
sending	O
the	O
correct	O
stream	O
of	O
ANSI	O
codes	O
to	O
move	O
it	O
from	O
the	O
current	O
to	O
the	O
clicked	O
location	O
.	O
</s>
<s>
Finally	O
,	O
ZTerm	B-Operating_System
included	O
a	O
10-verb	O
built-in	O
scripting	B-Language
language	I-Language
that	O
allowed	O
it	O
to	O
automate	O
basic	O
tasks	O
.	O
</s>
<s>
In	O
addition	O
to	O
be	O
able	O
to	O
run	O
these	O
manually	O
,	O
when	O
a	O
service	O
was	O
dialed	O
using	O
an	O
entry	O
in	O
the	O
editable	O
Dial	O
menu	O
,	O
ZTerm	B-Operating_System
would	O
look	O
for	O
a	O
script	O
with	O
the	O
same	O
name	O
and	O
run	O
it	O
automatically	O
.	O
</s>
<s>
The	O
first	O
public	O
version	O
of	O
ZTerm	B-Operating_System
was	O
0.9	O
,	O
which	O
was	O
released	O
in	O
1992	O
.	O
</s>
<s>
Two	O
major	O
versions	O
followed	O
;	O
1.0	O
of	O
April	O
1994	O
was	O
a	O
major	O
release	O
that	O
added	O
16-color	O
ANSI	O
support	O
instead	O
of	O
8-color	O
,	O
user-selected	O
fonts	O
including	O
Shift	O
JIS	O
support	O
,	O
Kermit	B-Protocol
protocol	I-Protocol
support	O
,	O
and	O
auto-opening	O
of	O
downloaded	O
files	O
.	O
</s>
<s>
The	O
latter	O
was	O
useful	O
when	O
used	O
with	O
offline	B-Protocol
mail	I-Protocol
readers	I-Protocol
like	O
Blue	B-Protocol
Wave	I-Protocol
.	O
</s>
<s>
By	O
the	O
time	O
that	O
macOS	B-Application
was	O
being	O
released	O
around	O
2002	O
,	O
the	O
BBS	O
world	O
had	O
largely	O
disappeared	O
.	O
</s>
<s>
However	O
,	O
a	O
number	O
of	O
devices	O
(	O
including	O
some	O
routers	B-Protocol
and	O
lab	O
equipment	O
)	O
still	O
use	O
serial	B-Protocol
ports	I-Protocol
to	O
communicate	O
,	O
typically	O
for	O
diagnostic	O
and	O
debugging	O
purposes	O
.	O
</s>
<s>
On	O
19	O
April	O
2001	O
,	O
Alverson	O
released	O
version	O
1.1b4	O
that	O
ran	O
on	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
10.0	I-Operating_System
,	O
Mac	O
OS	O
8.6	O
and	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
using	O
Carbon	B-Operating_System
.	O
</s>
<s>
Later	O
a	O
"	O
Classic	O
"	O
version	O
was	O
released	O
that	O
did	O
not	O
require	O
Carbon	B-Operating_System
,	O
allowing	O
it	O
to	O
run	O
on	O
older	O
machines	O
that	O
could	O
not	O
support	O
Mac	B-Operating_System
OS	I-Operating_System
8	I-Operating_System
or	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
.	O
</s>
<s>
On	O
18	O
July	O
2011	O
,	O
Alverson	O
released	O
a	O
Universal	O
Binary	O
version	O
1.2	O
that	O
runs	O
on	O
Mac	B-Application
OS	I-Application
X	I-Application
10.4	I-Application
through	O
Mac	B-Application
OS	I-Application
X	O
10.14	O
.	O
</s>
<s>
Because	O
this	O
version	O
is	O
not	O
64-bit	O
,	O
however	O
,	O
ZTerm	B-Operating_System
will	O
not	O
run	O
on	O
Mac	B-Device
OS	I-Device
X	I-Device
10.15	I-Device
and	O
above	O
.	O
</s>
<s>
On	O
modern	O
machines	O
without	O
built-in	O
serial	B-Protocol
ports	I-Protocol
,	O
ZTerm	B-Operating_System
can	O
identify	O
and	O
use	O
a	O
wide	O
variety	O
of	O
USB-based	O
serial	O
devices	O
.	O
</s>
<s>
The	O
list	O
of	O
supported	O
hardware	O
includes	O
the	O
standard	O
Macintosh	O
serial	B-Protocol
ports	I-Protocol
and	O
Geoport	B-Device
on	O
pre-PowerPC	O
G3	O
CPU	O
PowerPC	B-Architecture
Macintosh	O
computers	O
,	O
the	O
built-in	O
Apple	O
internal	O
modem	O
slot	O
and	O
the	O
USB	B-Protocol
ports	I-Protocol
on	O
PowerPC	B-Device
G3	I-Device
,	O
PowerPC	B-General_Concept
G4	I-General_Concept
,	O
PowerPC	B-General_Concept
G5	I-General_Concept
and	O
Intel-based	B-Device
Macintosh	I-Device
computers	I-Device
,	O
and	O
can	O
be	O
configured	O
to	O
work	O
with	O
adapters	O
(	O
including	O
various	O
USB	B-Protocol
port	I-Protocol
to	O
serial	B-Protocol
port	I-Protocol
adaptors	O
-	O
such	O
as	O
those	O
made	O
by	O
Keyspan	O
,	O
and	O
Apple	O
internal	O
modem	O
slot	O
to	O
serial	B-Protocol
port	I-Protocol
adaptors	O
-	O
like	O
the	O
Stealth	O
Serial	B-Protocol
Port	I-Protocol
and	O
the	O
now	O
discontinued	O
Griffin	O
Technology	O
gPort	O
,	O
under	O
OS	O
X	O
)	O
,	O
giving	O
it	O
a	O
unique	O
use	O
for	O
BBSers	O
and	O
hardware	O
tinkerers	O
.	O
</s>
