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Under "Tools", "Options", AutoBlockSelect must be set to 1, and theUseMicroBlocker option similarly set to 1.
Then, in Rx-Universe, the digital type must be set up to know that the calculator is configured to use the Micro-Blocker - this is set using the "LDS selects Micro-Blocker blocks" on the Digital Type.
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In this case, no prism is sent to the generator, because the digital calculator did not indicate that prism should be sent: