Your costs can very significantly, depending upon your requirements and the final option you choose. It may or may not require a hardware retrofit. Specifically addressing PC-DMIS, you would not have to retrofit a new controller. The latest version of TUTOR runs under 95/98 and NT, as does PC-DMIS, so you would not even have to reboot as a previous response indicated. Translating your existing programs to PC-DMIS is most likely possible only by going through DMIS, but you may find this to be more of a pain than a help.
If you want more detailed information regarding an upgrade to PC-DMIS, please contact the Customer Service group at 800-283-1883 (Pam Beaulieu, Jerry Santa Maria, et al). They can get the ball rolling for you.