Gottlieb system 80 THUNK, coil fire lock.

ixtlann

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I was reading about adding the clear/ reset function to the cpu/mpu z4/z5 sn74175 at a minimum.
Look at the bottom... Here is the link... It is of no consequence that I recall Clay's old guides had a similar entry...
http://www.flippers.com/gott-system80.html

Thought ideas etc, on doing the same thing to the ones on the driver board?
 
My Black Hole has always "thunked" at power on, for all the years I've had it. Never caused any problem, other than once in a while dispensing a ball, which I have to shoot and wait to drain before a game will start.

My Haunted House, on the other hand, has never thunked. I looked it over, and I don't see any mod that was done (at least not the one described) to prevent the thunk. One day I'll be bored and curious enough to hook up the logic analyzer to try figuring out exactly why HH doesn't thunk and BH does... maybe there's an easier thunk-mod/fix lurking in there.
 
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