Depending on the memory map you may be able to dump the whole firmware and language roms from dos DEBUG, but it is probably best to do with an eprom programmer.
Also, we'd need pictures of the chip labels anyway to determine what firmware revision the machine has.
It's really super easy to open the machine and take a photo, then grab the ROMs via debug. My friend may allow me top open it up and take a picture. I doubt he'd allow me to pull chips. He's doing me a favor as it is, since he's not touched this machine in 20 years except to move it...