Need help installing overexisting linux setup

I have an old P-100 system that has no cd drive that I want to install the 2x.com thin client on it. This system has 2 hard drives hda1 and hdb1 the current distro on it is ClarkConnect which is on hdb1. The system boots GRUB on HDA1 and it loads a kernel off HDA1 and then switches to HDB1.

the 2x.com client can be installed off a bootable cd or over an etherboot neither is a solution for me.

The cd drive that was part of the pc had died and I've tried 4 different cd drives and while the pc sees the drive it will not boot from them. I am unable to do an etherboot because there is no boot rom on the network card.

Besides being an ISO the client software is distrubited as an RPM.

I know there must be a way to extract the files from the ISO onto hdb which has plenty of free space then launch the install from GRUB but I can't figure out how to do it.

On the CD is a ISOLINUX.CFG file that has a few options. The option to install the software is

LABEL inst MENU LABEL 2X ThinClientOS Installer KERNEL linux24 APPEND ramdisksize=100000 nomce vga=0x311 initrd=minird24 root=-dev-ram0 init=-etc-init quiet console=tty2 splash=silent bootm=cdrom BOOTOPTSTART nodma BOOTOPTEND ro installdist x11=Xorg