Define
Vtab
Channel
BASIC
chr$(27)
"b"
chr$(N)
chr$(n1)
chr$(n2)
....
chr$(O)
(N
= 0
to
7;
n = 1
to
255)
Hex
1 B
42
Nh
n1
h
n2h
............
00
Nh
=
OOh
to
07h;
nh
=
01
h
to
FFh)
To
use vtab channels,
you
must
first
define
the vtabs for each
channel
you
want
to use.
To
do this, send the
MPS
1200
ESC
b
followed
by
the ASCII code for the channel
number,
from 0 to
7,
followed
by
the ASCII code for the line
number
of
each vtab
position
you
want,
from
1
to
255. After the last position, send
chr$(O) to end the sequence.
For example
to
define
channell
to
contain vtabs at lines
6,
10, and
14, and channel 2 to contain vtabs at lines 4,
7,
17, and 38, send the
commands: chr$(27)
"b"
chr$(l) chr$(6) chr$(lO) chr$(14) chr$(O)
and chr$(27)
"b"
chr$(2) chr$(4) chr$(7) chr$(17) chr$(38) chr$(O).
Channel 0
is
the default channel. Unless
you
tell it otherwise, the
MPS 1200 will use the vtabs that are defined in that channel. (Vtabs
set
with
the
command
ESC
B are automatically placed in channel
0). Vtab channels are selected
with
the
ESC
j
command,
described
and illustrated below.
Select
Vtab
Channel
BASIC
chr$(27)
"j"
chr$(n)
(n
= 0
to
7)
Hex
1B
2F
nh
The
vtab channel
is
defined
with
the
ESC
b
command
(described
above). A vtab channel
is
a set
of
up
to
16 previously defined vtabs.
Up
to eight channels,
numbered
0 to 7, can be defined.
To
select
a
vtab channel, use the
command
ESC
j followed
by
the ASCII code
for the
number
of
the channel you want, from 0 to
7.
For example,
to select vtab channel 2, send chr$(27)"1" chr$(2). Any subsequent
vtab
command
will use the vtabs defined in channel
2.
5-14
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