My Z5 Tower came with an AT PSU with a big black cable and a switch, you can get them out of old 486 machines available at all good car boot sales.
I still have my instructions from my Z5, they cover AT and ATX PSUs with or without the use of a PC, A1, G-Rex 1200,Predator-SE or EZKey-XS.
If you need them or think they might help, email me.
Nice avatar Vincent.
Cthuluh for President.
