SCO openserver 5 install problem

Hello all,
I'm trying to install SCO openserver 5 on a 2.5 Gig hard drive, and I tried fdisk and a low-level format of the drive. When I insert the boot diskette all seems fine, and it asks me to set the cd-rom and it sees it and reads from it. Well, I'm thinking all is well until right after I answer the question about install type:(it only lets me do a fresh install).....then i hit enter and this is what i get:

NOTICE: ram : no space on device on device 31/50
some pathname/trminit(or something like that)terminated at signal (8)
**Safe to power off**
press any key to reboot

If it would get passed this point the next step would allow me to use UNIX fdisk and divvy, but i can't get that far.
Any advice would be greatly appreciated.
kris.......

It ended up needing a boot driver to tell the comp that it was over 2gig. All installed now.......thx RTM.