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open-simh.simh/SDS/sds_cpu.c
Mark Emmer d5acbc6f7a SDS: Fix clock pulse interrupt bug
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.
2014-03-02 22:22:20 -06:00

64 KiB