You need a course or book on the machine that does not exist.
Bridgeport shipped this machine with DOS 6.20. If you do a backup with DOS 6.20 and try a restore with DOS 6.22 it will not work. EMI is shipping software with DOS 6.22.
See if you have a file called MAKEDISK. It should make a backup of your machine software. There have been many different versions of software for this machine. Variations include changes for the PARVEX Z axis motor instead of the SEM.
Most TC22 had a hard drive. The TC30 came with a flash card. A machine this old may now have a updated mother board and may have a DOM (disk on a module). This complicates telling you what to do and how to do it. Investing in DOS FOR DUMMIES may be a good thought.
Your PC Control issues may be related to changes made in the CMOS.
One of the most important files is BMDCPRMS.SYS as this is all the machine parameters, including tool change height, orient, encoder resolution, drive tuning, etc. A leadcomp.dat file was only used if Bridgeport thought that particular machine needed it.
This gives you a bit to play with.