D&M / Lab-Volt CNC machines

My girlfriend was at a local school district office and noticed they
had a stack of Lab equipment including some small CNC machines.
Since she knows how I collect machine tools she managed to pickup the
whole lot for $100.00. Now I am the proud owner of a D&M 5 CNC lathe
(Looks like a Unimat conversion), a Lab-Volt/D&M 3s CNC lathe and a
Lab-Volt/D&M 4s CNC Mill (both Sherline conversions). The school
district told her due to their license agreement they could not sell
or give away any of the software that went with the machines. So now
I have three cool little CNC machines but no software or
documentation. My first thought is to run EMC since my import mill
drill conversion is already running EMC. The machines have a TTL
connection in the back so I'm not sure if there is a way to interface
the PC running EMC directly to the machine or if I should tear into
the existing stepper drivers and either make a parallel interface or
replace them with newer drivers. I've been searching the web but have
been unable to find any documentation on these. Is anyone familiar
with these machines?

John Ross