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3-2 Configuring ROM-DOS
To define multiple configurations within the CONFIG.SYS file, you first
need to define a startup menu. Each menu item represents a different
system configuration option. Then, for each item on the menu, define a
configuration block. Each configuration block contains the specific
commands to be implemented as the system completes booting.
The menu-item definition and all configuration blocks are marked with a
block header. A block header is a descriptive label enclosed in square
brackets ([ ]). The start of the menu items must be marked with the block
header [MENU]. Each configuration block may have a unique label of
your choice. This label can be up to 70 characters long and can contain
most printable characters, including spaces, backslashes (\), forward
slashes (/), commas (,), semicolons (;), and equal signs (=). Square
brackets ([]) cannot be used in block names.
The menu block (or submenu block) may contain only the following
commands (a full description for each command can be found in the
Command Descriptions section in Chapter 5):
♦ Menuitem
♦ Menudefault
♦ Menucolor
♦ Submenu
♦ Numlock
Note: Although NUMLOCK may be used outside of a menu/submenu
block, it is typically used to enable the keypad for menu-choice
selections in the menu block.