The boot: prompt waits ten seconds for you to type advanced startup options.
If you don't type anything, the computer continues starting up normally: It
uses the kernel and configuration files on the startup device, which it also
uses as the root device.  Advanced startup options use the following syntax:

[kernel] [-v] [-s] [-a] [options]

Where kernel is the name of the Mach kernel, -v shows additional diagnostic
messages, -s starts up OPENSTEP in single-user mode, and -a causes OPENSTEP
to ask you for a root and a /private folder. For information about additional
options, see "Installing and Configuring OPENSTEP."

If the computer won't start up properly, you may be able to start it up using
the drivers you used to install OPENSTEP. Type: config=Default

To continue starting up using standard options, press Return.