CONFIG.SYS Change Control Files

Some multimedia subsystems require unique statements in the CONFIG.SYS file. The CONFIG.SYS change control file creates, adds, merges, and replaces CONFIG.SYS statements through the use of keywords. The master control file, CONTROL.SCR, specifies a SSCONFIGCH keyword for each file that contains changes to the CONFIG.SYS file.

The following describes the keywords used in the CONFIG.SYS file.

Keyword

Description
DEVICE
Adds new device statements to the CONFIG.SYS file. The right side of the equal sign must be a quoted string. For example:

DEVICE="$(DEST)DEVICE.SYS /parameters"

A supported macro may be used. Ordinarily, the $(DEST) macro is used. When the $(DEST) macro is used, MINSTALL searches for the file named DEVICE.SYS in the control files. If MINSTALL finds it, the $(DEST) macro is replaced with the full path of the destination of that file, and the final statement is added to the CONFIG.SYS file. For example:

DEVICE=d:\SOMEDIR\DEVICE.SYS /parameters

MERGE
Merges data into an existing statement in the CONFIG.SYS file. For example:

MERGE "LIBPATH"=1

The number 1 relates to the CONTROL.SCR file destination subdirectory 1. After MINSTALL finds subdirectory 1, it adds this path at the end of the current LIBPATH statement. (A semicolon ends a line and is used between components.) If there is no current LIBPATH statement in the file, a LIBPATH statement will be generated with the specified path.

If the right side of the equal sign is not a numeric string, the line is copied as is. For example:

MERGE "SOMEVAR"="WHOKNOWS"

If the SOMEVAR environment variable exists, WHOKNOWS is added at the end of the statement. If the variable does not exist, the statement:

SOMEVAR=WHOKNOWS

is added to the CONFIG.SYS file.

Note: Refer to the TOOLKIT.CH file in the \TOOLKIT\SAMPLES\MM\CF subdirectory.

You also can insert SET following the first quotation mark character inside the first quoted string. The word SET is ignored unless you are adding a new line to the CONFIG.SYS file. In this case, SET is appended to the beginning of the line. For example:

MERGE "SET SOMEVAR"="WHOKNOWS"

REPLACE
Replaces an existing CONFIG.SYS statement.

REPLACE can be followed by a variable name or a variable name preceded by SET inside a quoted string. On the right side of the equal sign is either a number or a quoted string. A supported macro may be used. For example:

REPLACE "SET MMBASE" = 0

If the variable MMBASE is in the CONFIG.SYS file, then the value is changed to 0. If the variable does not exist, the following statement is added:

SET MMBASE=C:\MMOS2;

Note: This statement replaces the existing statement. Do not use this statement in conjunction with a path statement.

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