Haunted Houses are always dirty. Clearcoat the playfields with the dirt on it

Gottlieb uses a different chip to drive the displays because the '1' is the middle segments instead of just sharing the rightmost segments, but it's essentially similar. - I think they even use hardware to detect the '1' and routine the signal differently, and the decoder chip doesn't strip out invalid BCD codes.

I'd think that whatever framework Hans ends up using should be able to drive a display directly without having to interface with another piece of hardware - are there shortages of I/O pins on the boards or something?

You can't do a setup where you just define the flipper relay and let the switches do what they do? Or are you doing it so you can use low voltage contacts on the flippers in a fliptronic-type setup?

That's a lot of coils just for flippers!

Ironic that a new build on a system 80 platform has a similar grounding issue as the originals did.....

I was reading the Gameroom magazine article about the original setup for HH, John Osbourne indicated that the upkicker was a smooth design vs. the triangular setup - maybe incorporate that instead? Also he said the ruleset as shipped was completely different from what he'd intended - I don't know if it's detailed anywhere what he originally intended for the game.

At least you're emulating the behavior of the original there....

What does the actual top of the tube look like? There was no picture in the gameroom article of this part, but I think they said they prototyped it with thin wall steel? The failure long term of the upkicker is what led them to shoot the ball sideways on Black Hole.