Issue:
594 controller will not IPl

Cause:
The FF refers to a loader error and typically caused by a faulty twinax card.

Solution:

To identify  the problem feature card, check the top line of the LCD it should identify  the slot and which card is generating the error,if the controller doesn,t identify the defective card , remove one card at a time and power on Perle to isolate the faulty card.
 Check the software diskette and floppy disk drive.

720 || FF F0AD00
720 || FF F0AD09
720 || FF F0B9ED
720 || FF F0B979
720 || FF F0B90B