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Single-Step Execution

The STEP switch is used to run a program one instruction at a time which may result useful for debugging.

If the switch is in active position (up), the computer will fall into Halt mode immediately after having executed the current instruction. Pressing the CONT button will cause the next instruction to execute after which the computer will halt again. You can press the START button instead to branch execution to any different address.

You escape from this condition by flipping the STEP switch to its inactive position (down).