Transferring files to XT DOS 3.3 machine

[modem7]

I need to transfer files files over a serial port as I don't have access to anything that can write 5.25" disks.

With the IBM 5155, you do have the option of connecting a 1.44M diskette drive to the IBM floppy controller, and using 720K diskettes. See [here].

Thanks for all the suggestions - I'll try laplink next.

A Laplink procedure is [here], but just like with FastLynx 3.3, there can be issues using USB-to-serial adapters.