Gottlieb System 80 pins (Black Hole, Haunted House, Etc.) suffered from
bad grounding from the factory. Later in the life of the company, they
figured out that adding a second ground on one interboard connector
cable would greatly improve reliability. This is a common fix for the
older games (adding the lead) but the best method is to ground each
board back to a common point. The system 1 games that proceeded them
had other problems, but grounding wasn't one of them for some reason.
js@cimmeri.com wrote:
>
>> John wrote:
>>
>> At this time Gottlieb pins electronics were designed by Rockwell
>> engineers and that explained why they were having trouble with coil
>> failures - Rockwell designed a proper system using a star ground, but
>> they allowed no redundancy.
> So, did the Gottleib pins work initially, and only have trouble after
> something in the ground system degraded? What degraded?
>
> JS
>
>
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