Batteries replaced, but the problem still remains.
When turned on it asks for the disk that contains "BOOTROM v5.01".
This is the list of software I'm looking for:
BOOTROM ver. 5.01
C3G-SYS ver. 5.33
C3G-PDL2 TOOL ver. 5.32
PCINT CRT EMULATOR FOR PC ver. 5.03
EZ PDL2 ver. 5.32
Meanwhile still no response from Comau ...