Missile Command trackball up/down moves left/right

nagamitsu

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Just replaced the opto couplers in my previously not working trackball. Now I have full proper left/right movement on the trackball. But up/down doesn't work, it actually (slower than the normal left/right) moves left/right.

Specific chip for up/down on the main PCB maybe?

Tim
 
there are 2 MC14584 on the MC board. if I recall one controls directions for P1 and the other controls directions for P2, they often go bad so a reasonable solution is to just replace them both as there's a high probability that will fix the problem.
 
there are 2 MC14584 on the MC board. if I recall one controls directions for P1 and the other controls directions for P2, they often go bad so a reasonable solution is to just replace them both as there's a high probability that will fix the problem.



Thank you. May be worth just replacing regardless. Will try to track down a couple
 
You can also buy SMD to DIP adapters if you decide to buy SMD parts. That solution, however, is more $$$ overall ...
 
Thanks for everyone's help! And sorry for all the questions, first trackball machine, and not familiar enough yet with Atari systems.

I now have a perfectly working Missile Command! Replacing those two with the two chips I got today, resolved the issues fully.

Tim
 
huh today I learned something new too (that the 74HC14 was a replacement for the MC14584)
good info.

glad your game is working again!

-brian
 
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