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The single-instruction Clock Pulse interrupt (75 octal) may be a MIN or SKR instruction. The function rtc_inst increments (MIN) or decrements (SKR) the operand and tests for zero and generates a Clock Sync interrupt (74 octal) if so. However, the SDS 940 reference manual is incorrect; in the SKR case, the test should be if the result is negative.
64 KiB
64 KiB