Download
this bootdisk. Place a known good floppy in your drive and then click on the downloaded file. It will then format and
create a bootdisk on
your floppy.
Boot the IBM with this bootdisk and when you get the A:\> prompt, type in;
fdisk
hit ENTER. Hit enter again to choose
Y to large disk support if presented. Then choose option 4 - Display partition information. post back EXACTLY what it says.