GRUB is in the MBR of the 1st hdd, hd0.
Linux boots OK... and of course I can see GRUB menu perfectly and all the entries (actually 2: Linux and W98). For W98 the entry in grub.conf is:
title Windows 98
selecting this entry ...
Booting Windows 98
can't find operating system
...and the machine halts. Three fingers and go BIOS.
(the "can't find operating system" message comes from M$ code)