Zinfer
Well-known member
can someone tell me how to check if the clock circuit is working on a Gravitar/Space Duel?
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You don't want to probe the crystal itself though... you need to probe after it's been buffered, since the probe will affect the crystal. I believe both Space Duel and Gravitar have tabs labeled for the clocks... from a quick look at the schems of Gravitar, you should have one labeled 12MHz, 6MHz, and Φ0 (1.5MHz)... and if you don't see those tabs, you can check pin 5 of chip E4, and that'll be the 12MHz input. The other frequencies (6, 3, and 1.5 MHz) are generated by E4 (counter) on pins 3, 2, and 6 respectively.
DogP