These files are of the Trackstar 128 utility disk that contains the software required to start an installed Trackstar 128. They are presented as Option Board Transcopy 5.x images because the Trackstar 128 disk is specially formatted with a combination of MFM and GCR tracks that the utilities require. On startup, when the board senses it is connected to IBM PC drives, the utility reads the GCR tracks to determine if the drive connection/translation is working properly.
Amiga789