The IGEL 2110 has a standard PC Phoenix Award BIOS - hit the DEL key repeatedly on power-up in order get into the BIOS setup screens. It will boot from flash, IDE drive, CDROM or USB.
Booting Puppy Linux from a USB connected CDROM drive worked well. The on-board Compact Flash card is visible (sda) and contains a single Linux partition (sda1), however I'm not sure exactly what filing system is in use as Puppy would not mount it. (ie It is definitely not ext2 or ext3).