HI so i have an old as original sin GMF p-150 robot with an rh karel controller that ive been trying to get to work.Im probably going to retrofit it for fun bust im trying to see if i can get the old controller to work firdt. At first power up literally nothing happened it just wouldn't turn on. I bypassed the safety board and got the IO unit and the basic control unit as well as the drives to power up, the teach pendant displays the message teach pendant ready but the CRT remains blank, only the power on light turns on. Im aware that the firmware of the system is nonvolatile but im not sure nonvolatile means sit in a warehouse for 20 years and remain intact nonvolatile. Could it be the firmware degraded to nothing? Could the ram batteries being dead be the problem? Anyone with experience with these old units?

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