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By James L. Peterson and Werner Rheinboldt (Auth.)

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These other machines may be other computers (such as in a computer network), laboratory measuring devices, manufacturing equipment, switching equipment, or almost anything which can produce or receive electrical signals. Computers interact with other machines by sending electrical signals on cables. The cables are attached to the computer by interface boards which plug into slots in the computer chassis. Interface boards are flat pieces of plastic which contain the electronic circuitry to convert between the binary words of the computer and the electrical signals which go to and from the devices.

Before considering over­ flow, notice that, 1. 2. Overflow can now occur because a number becomes too large (positive) or too small (negative), and The addition of two numbers of opposite sign can never cause overflow. Now consider the addition of two positive numbers and two negative num­ bers which cause overflow. 2 T H E C O M P U T A T I O N U N I T There are several ways to state the condition for overflow. One method is to notice that the sign of the output is different from the sign of the inputs.

3 THE I N P U T / O U T P U T S Y S T E M 6. whether the computer is running or halted, and perhaps other state information. A set of control switches, which allow the state of the computer and its memory to be manipulated. Common control buttons include a button which when pushed will read the console switches as an address and remember that address (LOAD ADDRESS); a button which will display in the status lights the contents of an addressed location of memory (DIS­ PLAY/EXAMINE); a button which will store the switch register value into an addressed location of memory (DEPOSIT/STORE); a button to allow a program to be executed one instruction at a time, one instruction exe­ cuted every time the button is pushed (SINGLE STEP); and so on.

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