Or copy DVD to external usb hard drive and boot from that?
Maybe this helps:
USB Info and Benefits of Dual-Channel USB
Last Modified: October 04, 2008
Article: TA25908
... Bootable USB drives: A storage device such as a SuperDisk, Zip disk, or other USB storage drive can be used to hold a valid system folder and used at startup ...
http://support.apple.com/kb/TA25908?viewlocale=en_USiMac: How To Differentiate Between Models
http://support.apple.com/kb/ht1362Mac Systems
http://www.everymac.com/systems/by_capability/mac-specs-by-machine-model-machine-id.htmlOr maybe use firewire?
Install Tiger on iMac G4 700 Mhz without DVD Drive
http://www.ehmac.ca/mac-ipod-help-troubleshooting/34559-install-tiger-imac-g4-700-mhz-without-dvd-drive.html