The settings are divided into four groups: Volumes, Graphics, Serial Ports, and Memory.
The main part of the volumes pane is a list that contains all volumes to be mounted by SheepShaver. If this list is empty, try to detect and mount all HFS partitions it can find. CD-ROM drives are always automatically detected and used.
SheepShaver can use HFS partitions, whole HFS formatted drives, and it can also emulate hard disks in single BeOS files.
To add a Mac volume to the list, mount it on the BeOS side, click on "Add...", go to the "Disks" level in the topmost popup menu of the file panel, click once on the volume you want and click on "Add". A line beginning with "/dev/disk/" should then appear in the volume list. After adding volumes to the list, you should unmount them on the BeOS side again.To remove a Mac volume, select it in the list and click on "Remove".
Double-clicking on an entry in the volume list will add or remove a "*" in front of the device name. Volumes marked with a "*" are read-only for the MacOS under SheepShaver.
To boot from CD-ROM, set the "Boot From" setting to "CD-ROM". The "Disable CD-ROM Driver" box is used to disable SheepShaver's built-in CD-ROM driver. This is currently of not much use and you should leave the box unselected.
Here you can set the refresh rate of the MacOS window. Higher rates mean faster screen updates and less "sluggish" behaviour, but also require more CPU time. The "QuickDraw Acceleration" box should always be enabled. It allows for faster graphics in full-screen modes.
You can select to which ports the MacOS modem and printer ports are redirected. This doesn't make much sense on a PowerMac, but on a BeBox you can assign the modem and printer ports to any of the four serial ports (or com3/com4) or the parallel port of the BeBox.
Here you select how much RAM will be available to the MacOS (and all MacOS applications running under it). SheepShaver uses the BeOS virtual memory system, so you can select more RAM than you physically have in your machine. The MacOS virtual memory system is not available under SheepShaver (i.e. if you have 32MB of RAM in your computer and select 64MB to be used for MacOS in the SheepShaver settings, MacOS will behave as if it's running on a computer that has 64MB of RAM but no virtual memory).