I recently bought a 91 star trek data east.
For 1 the dmd durring normal scoring only will freeze up and make no sense and do jumbled up scoring ect .but will go into video mode no problem during game play ..
In attract mode it's perfect..
I purchased two new ribbon cables to be safe from different companies.. same thing ..soon as I shut the game down or reseated the plugs it's good for a while ?
Another is switch 27 and 28 were not registering in switch test .?? I replaced one switch of the two and now it has a error come up telling me there bad ? I tried putting the original switch back in and it still comes up as a error but stil won't register in manual switch test ? I'm gonna try to replace the other switch that was not registering wich was switch upper left hole top switch number 28..

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I wired the switches on exactly how they were ? I just switched out number 28.. same deal.. come up as error.. but not registering in switch test at all ?
I know nothing of this latest rom ??or display rom ? Do you happen to have a link ?

Switch 27 and 28..

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And switch 29 has no diode ? But number 29 works moving target hole ?
?and switch 52 works.upper left hole bottom ?

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I'm also very new to data east .
I'm checking all connectors linked to the white and yellow.. white and red and green and yellow wires..

http://www.actionpinball.com/parts.php?item=ROMS316.
Are these what I'm looking for?
I should purchase game and display?

How do I know if they are the newer roms ?

OK will do...
One one the cpu and one on the back of the display itself correct ?
Also any idea on my switch issue.?
Thank you very very much...

Are both roms genraly socketed on the game ?one on the cpu and one on the back of the display itself ?

Grumpy I kind da thought it may be the issue .
So your saying put the greens together like the others and move the white to the middle and install the diode . ?

Greens to the middle and white to the far right...

Yup.. did the trick grumpy.
Switches now register .. score ect...
I just ordered the updated roms for the game as well..

Replaced all 5 roms.. seems to be fixed . And man what a big difference..