Having now built a multi rail power supply with a 7805 and two zener diodes to achieve the +5 v -5v +12v voltages required by the 2708 Eproms .
some mods to my raspberry pi reader program the four 2708 1k Eproms read ok and produced the correct checksums.
info here:-
https://sites.google.com/view/transa.../eprom-reading
I now have all Eproms backup and using the emulator written by Robin Stuart after some mods to the memory access they work !!!! on the emulator at least.
they can be down loaded from hear:-
https://sites.google.com/view/transam-triton/home.
Now the task is get the real machine up and running I do however need the graphics prom or a hex dump.