When the Backup memory is lost... mine flashed 666666 999999 .... 69 69 69 did someone have a sense of humor at Zaccaria?
... and most of my displays were doing wierd things.. I just replaced all the chips.... hardest ones to get were the 4002's the simplest chip of them all. Never seen one with a burnt resistor? Out of the 5 machines i've owned this year ive had a 12 individual tubes out, 2 transistors gone, and a heap of IC faults.... thats out of 27 displays.... 6 digit and 8 digit.
Ive also had displays that cause intermittant crash on boot up, can't start game, no game over lamp... etc.. fixed by replacing chips communicating (or receiving anyway) on the ribbon.
Actually I think I still have a lot of 4002's somewhere....
The RAM on the CPU is terrible in these... and often requires replacement....
