how do I dual boot my98 system with NT

Is the drive split in partitions?
It is not clear as to how you know that the operating system is loaded,if you have WINNT 4 as the second OS,it can not read a fat32 file system ,so this is why you have no boot manager
You cannot dual boot WIN 98 and NT 4 on FAT32
You will need a clean drive and partition the drive with FAT
You need a third aprty software suchas Partition Magic or Partition Commander,to use FDISK donot enable large disk support this will enable Fat 32 automatically
Once you have the parttition sizes and formatted,proceed to Install Win 98 and then you can install WINNT
Ref:
www.pcmech.com/show/os/44
www.thetechzone.com
http://computing.net/howto/advanced/fat32ntdual
www.riva3d.com/dualboot
www.microsoft.com/dualboot/

I agree with soulrider on everything except for the fact that you need a third party boot manager. All you need to do is edit the boot.ini file in NT to point it to the Win98 partition. When NT comes up and gives you the choice of booting to either Windows NT with VGA or booting to NT without VGA it should also read "unknown operating system" or something like that. You need to edit NT boot.ini (hidden file in the root of C) so that it will read Windows 98

http://www.xosl.org

Extended Operating System Loader (XOSL) is the world's only full-featured free boot manager with a real, easy-to-use and full-blown graphical user interface. Click the screen shots link to see what XOSL is like, and decide foryourself!
DOS graphical multi-OS multi-boot manager supports all flavors of DOS, MS Windows 9x/NT4/2000, Linux, BeOS and Solaris, can
boot from CD-ROM.

Microsoft article Q243896 titled, "How to Dual Boot Windows 98 and Windows NT 4.0 with FAT16 or NTFS Volumes"

For Windows 98 to coexist with Windows NT 4.0 on a large NTFS partition, a small FAT active partition must exist at the beginning of thedrive. Currently, FAT16 using the 32-KB cluster size is the only common file system that both operating systems can address from Power On Self-Test (POST). Therefore, making a FAT drive C partition that is 2 GB in size or less, ensures the proper cluster size is used.

If the active partition is NTFS or large FAT16 using the 64-KB cluster size, Windows 98 does not boot because these file systems are not accessible to the boot code that Windows 98 uses. Likewise, if the active partition is FAT32, Windows NT does not boot.
You can use the following procedure to define the partitions you need using the Fdisk tool. After you install Windows NT, you should avoid formatting logical drives as NTFS within the extended partition. Although you can do this from Disk Administrator, it is not supported because Fdisk cannot recognize NTFS logical drives within an extended partition. You should note that if you make NTFS logical drives, any future deletion of a FAT logical drive under Fdisk results in the accidental deletion of the first NTFS logical drive instead. To prevent the accidental deletion of a NTFS logical drive, you should create all logical drives within Fdisk and delete them from Disk Administrator. You should then format theRAW logical drives from within the operating system that you want to have access to that logical drive.

Cut and paste this link for the rest

http://support.microsoft.com/default.aspx?scid=kb;EN-US;q243896

(REMOVE SPACES from the pasted URL.)

Maxwell