Advanced
BIOS
Functions
6-2
• The Control Sequence Introducer (CSI) signals an escape sequence com-
mand
to
the system. In the APC environment, the CSI
is
the ESC character
(lBH
or
27 decimal). The ESC
is
usually followed by a square bracket
(D.
(The use
of
a bracket
or
other character depends
on
the particular escape
sequence.)
A t the CP
1M
-86"
A>"
prompt,
pressing the ESC key causes the characters
""[" to appear on the display screen. Therefore, escape sequences
that
are
introduced by ESC followed by a square bracket appear
on
the display
screen as
"11[[".
• A parameter
is
a string
of
zero
or
more decimal characters which represent
a single value. Leading zeros are ignored. The decimal characters have a
range
of
0 (30H) to 9 (39H). Two types
of
parameters are used in escape
sequences .
• Numeric parameters represent numbers. Unless otherwise specified, any
numeric value may be used. Numeric parameters are designated Pn in
this document.
• Selective parameters, designated in this document by Ps, are those
that
select a subfunction from a specified list
of
subfunctions.
You must replace
Pn
and
Ps, as well as certain command-specific parame-
ters, with the appropriate values in the command.
A
parameter string
is
a list
of
parameters, separated by semicolons (3BH).
Default
is
a function-dependent value
that
is
assumed when
no
value
is
explicitly specified for a parameter.
• The Final Character
is
a character whose bit combination terminates an
escape
or
control sequence. There
is
a different character for each escape
sequence.
In
the example above, "A"
is
the Final Character. The Final
Character must be entered exactly as it appears in the command format.
Be
careful to use uppercase
or
lowercase correctly.
As
another
example, the following escape sequence format
is
used to set character
attributes.
ESC[Ps;
...
;Psm
To
select the attributes "over line" (3), "under line" (4),
and
"blink" (5), you would
enter the values
that
correspond to the following sequence. Note
that
lowercase "m"
is
the Final Character.
ESC[2;
3;
4m
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