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This switch has two positions, "Half" and "Run". In the "Run" position, the program will run automatically once it is started. In the "Half" position, the machine will execute one-half of an instruction for each depression of the "Program Start" key, provided the "Control" switch is in either the "Run" or "Address Stop" position. The "Control" switch is discussed later. With an operation code in the operation register and a data address in the address register, depressing the "Program Start" key will cause the operation to be performed and place the address of the next instruction in the address register. This is the "Data Half-Cycle" of the instruction. The next depression of the "Program Start" key will cause the next instruction to be located and placed in the program, operation, and address registers. This is the "Instruction Half-Cycle" of the instruction.
Als ich noch in BASIC programmierte, nannte man die schrittweise Fehlersuche "Tracing", wörtlich "Verfolgung", bei der man von Anweisung zu Anweisung springen konnte und dabei die Rechenergebnisse und Registerinhalte vor sich hatte.