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This code sets the rightmost bit of myShort to 1, no matter what its current value. This line of code, based on the |= operator, does the exact same thing:

At the end of this lab, you ll be able to Identify the connectors of a PC power supply Measure the output of a PC power supply

myShort |= 0x0001;

The & operator takes two values and ANDs their bits together, resolving to a single value. This operator is frequently used to clear a bit. Clearing a bit sets its value to 0. Check out this code:

The materials you need for this lab are The disassembled, non-production PC computer system used in the lab exercises in 3 (with the power supply reinstalled) A multimeter A PC power supply tester Optional: A working PC with an ATX power supply

i

short myShort;

myShort = 0xFFFE & myShort;

There are two ways to determine whether a power supply is providing the proper voltages to the components of the computer One is the traditional method, using a multimeter to measure the actual voltages Another method growing in popularity is the use of a PC power supply tester

This code sets the rightmost bit of myShort to 0, no matter what its current value. It might help to think of 0xFFFE as 1111111111111110 in binary. This line of code, based on the &= operator, does the exact same thing:

myShort &= 0xFFFE;

i 1

The ^ operator takes two values and XORs their values together. It goes along with the ^= operator. The ~ operator takes a single value and turns all the ones into zeros and all the zeros into ones. The &, |, ^, and ~ operators are summarized in Table 11-1.

Cross-Reference For details on DC power from the power supply, refer to the Supplying DC section in 8 of Mike Meyers CompTIA A+ Guide: Essentials

A 1 1 0 0

B 1 0 1 0

In the following steps, you ll measure DC voltage coming from the PC power supply The two places to measure power supply output are at the Molex power connectors and at the motherboard power connector Molex power connectors plug into devices that need 5 or 12 volts of power These include hard drives and CD- or DVD-media drives Mini power connectors also carry 5 or 12 volts, but on modern systems these are used only for oppy drives On most recent systems, the power supply will provide two motherboard power connectors: the 20- or 24-pin P1 and the smaller P4 (see Figure 8-6) Both of these power connectors are used on motherboards requiring an additional 12-V power supply You ll then plug the P1 power connector into a PC power supply tester and verify that the readings you measured with the multimeter are within tolerance The power supply tester has LEDs that will glow green for each of the voltages that it passes

The previous examples assumed that a short is 2 bytes (16 bits) long. Of course, this makes for some implementation-dependent code. Here s a more portable example. This code sets the rightmost bit of myShort, no matter how many bytes are used to implement a short:

short myShort; myShort = (~1) & myShort;

Equation (16) is a generalization of Equation (15) and provides a refined model for pipelined processor performance In this model, gj representsjhe fiaclLon_pf time when there are i instructions ijrithejrip^line In otherwords, g represents the fraction oftTme when the pipeline is stalled for (rV - i) penalty cycles Of course, g is the fraction of time when the pipeline is full This pipelined processor performance model is illustrated by applying it to the six-stage TYP pipeline in 2 Note that the TYP pipeline has a load penalty

Warning Although the power coming out of the PC power supply is considerably less lethal than that coming directly out of the electrical outlet, you should still take all appropriate safety precautions before taking measurements

You could also write this as follows:

myShort &= (~1);

The last of the binary operators, <<, >>, <<=, and >>= are used to shift bits within a variable, either to the left or to the right. The left operand is usually an unsigned variable, and the right operand is a positive integer specifying how far to shift the variable s bits.