Boot usb pen, without BIOS support

[elalomn]

Hi I'm pretty new to BSD and pfsense.
I want to use and old computer as my router/firewall with 3 network cards.
First i ran pfsense as a live cd and I liked it very much so i decided to install it, but since I don't have Hard Drive nor Floopy Disk in that machine I decided to use an USB pen drive (1GB) as the storage device.
I succesfully installed pfsense in the pen drive from the CD.
The problem is that the computer's BIOS is pretty old and has not USB boot support  :(

So my cuestion is: can I use the pfsense CD, to boot the one in the USB??

[GruensFroeschli]

Yes.
Just boot off the CD and the USB-stick will be used to read/write the config.

Take a look at the m0n0wall documentation since this applies to pfSense too.

[hoba]

Format the stick and only use it to store the config booting from the livecd. This is option 98, not 99.