Get it here:
https://www.denfordata.com/downloads/dos ... LD_DOS.zip
It is STARTURN software for machines built prior to them having the cylindrical perspex guard. Realy old DOS stuff.
It seems to run OK, but obviously not been checked linking to a machine - it just hangs my computer when I select MANUAL MODE but that's what it used to do if it didn't find a machine!!!
See the readme file for more info