Nine Ball
Stern Electronics, 1980You're currently viewing posts by Pinsider frunch.
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I'd try narrowing it down to the mpu or one of the displays. Sometimes a problem with one display can cause issues with the other displays too. With the game off, unplug all but one display. Boot up and see if problem persists. If ok, turn off and plug in next connector and try again etc.
Are you sure all the jumpers on the board are set correctly? I acquired an Alltek mpu recently and noticed there are two jumpers on the board (for Clock Speed) in addition to the dip switches. Make sure they're set for Stern MPU-200. (Note mine are not set for that in the pics below, I'd need to move both jumpers over a pin to the left in order to do so).
IMG_20210221_181623.jpgIMG_20210221_181638.jpgYou're currently viewing posts by Pinsider frunch.
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Point Pleasant, NJ