PC Hardware A Beginner’s Guide

(^280) PC Hardware: A Beginner’s Guide Higher Resolutions Cannot Be Selected If there is not enough RAM on the video card to sup ...

CHAPTER 13 System Resources 281 Copyright 2001 The McGraw-Hill Companies, Inc. Click Here for Terms of Use. ...

(^282) PC Hardware: A Beginner’s Guide T he microprocessor, aka the processor or the CPU, controls either completely or in part ...

Chapter 13: System Resources^283 devices through their mailboxes. After the CPU completes the requested task, any data or instru ...

Checking Out IRQ Settings Not every PC has all of the devices listed in Table 13-1. In fact, on any PC, the IRQs can be assigned ...

Chapter 13: System Resources^285 Figure 13-1. The Windows System Properties window Figure 13-2. The Windows Computer Properties ...

Compare the IRQ assignments of your PC to those in Table 13-1. They should match for the most part. Any exceptions are likely b ...

Typically, if two devices share an IRQ, like the COM ports listed in Table 13-1, only onecanbeactiveatatime.Onearlysystems,itwas ...

(^288) PC Hardware: A Beginner’s Guide Configuring IRQ Settings There is a variety of ways to set an IRQ setting for a particula ...

Jumper Settings Older adapter cards, especially video or network interface cards, use jumper blocks to set their IRQ settings. T ...

Some installation software can read the IRQ settings and adjust the IRQ assignment for its device. However, this is rare, and yo ...

Chapter 13: System Resources^291 Ofcourse,yourfirstcluethatanIRQconflictmayexistisifanewdeviceisn’tworking properly, if an exist ...

(^292) PC Hardware: A Beginner’s Guide Figure 13-7. The Device Manager Properties window showing no resource conflicts Figure 13 ...

Chapter 13: System Resources^293 You may find that very few of your system resources can actually be changed and whenyouattemptt ...

There are many (about 35 and growing) Device Manager error codes, most of which deal with device driver issues, but here are the ...

Chapter 13: System Resources^295 Each PCI expansion slot has four interrupts of its own, which are designated PIRQs (PCI interru ...

Plug and Play Resource Assignments Plug and Play (PnP) is a device configuration feature that must be supported by the oper- ati ...

the circuits and logic required to control eight IRQ lines. Figure 13-11 illustrates the gen- eral design of a PIC. It is called ...

tells the PIC that the IRQ has ended and the ISR is cleared. The highest priority IRQ pend- ing in the IRR is then placed in the ...

Chapter 13: System Resources^299 I/O Address (hexadecimal) Size in Bytes Assigned To 0000 – 000F 16 Slave DMA controller chip 00 ...