I'm trying to figure out exactly how that cam works.
I'm guessing there is an optical or mechanical switch which reads the part which sticks up (to end the chicken's turn and make the chicken make the 'finished turn cluck'), the depth of the cut of the cam controls when the chicken 'pecks' (due to the cliff/falloff at one point; the chicken itself appears to be mounted on a spring, and its head on a second spring, so it pecks forward when the cut suddenly gets deeper), and the distance from the center of the cam controls whether the chicken is facing right, left or centered. In several youtube video it is obvious that the switch did not properly activate (or the cop421 ignored it being activated) on the first full rotation of the cam, so the chicken repeated its movements exactly and did finish its turn on the second rotation.
<- second turn the cam spins at least twice <- second turn the cam spins twice
LN
"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
I Took a Lickin' From a Chicken is added and playable. I just need to do the internal artwork (save the best^B^B^Boring work for last, right?). There's an annoying problem with sound, caused by aliasing, which again is caused by missing interpolation in MAME's sound core. Hear: 1) http://tsk-tsk.net/net/temp/chicken_dac.wav 2) http://tsk-tsk.net/net/temp/chicken_speaker.wav The old speaker device has its own filtering, unlike the modern dac device.
It remains a mystery who is the original contractor/manufacturer. The Japanese version was by Bandai, and they consistently have PT-xxx as pcb label.
I also fixed Milton Bradley's Plus One (the multiplayer Simon-ish board game).
I uploaded some more pics of the cam (including some depth measurements) and a video of the cam while playing a game of tic-tac-toe.
The chicken feet are mounted on an axle with a spring that keeps a piece of plastic in the groove like a record needle. The chicken's legs are springs.
I assume that the game chooses a random number of rotations.
I assume that the game chooses a random number of rotations.
It checks the motor position once every half second or so. Depending on motor speed, the window is small enough for it to be missed sometimes and the game will do 2 rotations.
Aha- I wonder if it was just luck that in my video, 2 of the times it rotated three times, and once it rotated 5 times. Maybe something's wrong with the switch, but the contacts look clean and measure low resistance.
I like the Japanese name even better than the English name.
I got a Conic basketball in the other case, but this one also has an MP0907.
I think one of the chips required is already decapped by Sean but I have no knowledge how to convert the pics to logic. I'd like to learn this however and with netlist around it should be possible.
I think one of the chips required is already decapped by Sean but I have no knowledge how to convert the pics to logic. I'd like to learn this however and with netlist around it should be possible.
