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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Author</th> <th class="thCornerR">Message</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>nfnw3tm8</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/subSilver/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Sun 3:12, 22 Sep 2013<span class="gen"> </span> Post subject: which we know take for granted</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">toolbar creator macbook pro refesh - We Owe a Debt to Early <br /> <br /> We Owe a Debt to Erly Computer Bus Development <br /> <br /> [url=http://www.achbanker.com/home.php]hollister[/url] Why was htere such a rush in the developmet of the vinage computer bus? <br /> <br /> All in all there were a number of ongoing improveents. Thsee invcluded. 32 bit widths. Bus mastering. Less susceptible to noise in that they were quietr in siugnal transmisssoion. More convenience of seutp of add on boards via sogftware. <br /> <br /> The ISA bus came in only 8 bit and 16 bit formats. Whhereas the later 386 and 486 chips , in both the [url=http://www.tagverts.com/wellensteyn.php]wellensteyn[/url] DX and SX formas while they did have a 32 bit path were hobbled by the ISA bus. As a result they couuld nevver rrealize their true 32 bit seped pootential. Later buses such as the MCA and EISA budsses were able to overcome these inherent limitations. <br /> <br /> Thee data highways referred to as : busses are the data transmission lines aroiudn the PCs. The bus serves as the path for information tarnsmission aropund the [url=http://www.teatrodeoro.com/barbour.php]barbour sale[/url] PC. True this routing is controplled by the [url=http://www.1855sacramento.com/moncler.php]moncler[/url] CPU. Howeever as that point in vintae computing history this was not an issue. The PCs were stand alpone single CPU units. <br /> <br /> However as time went on and PCs got faster and more compliicated with less expensvie additional CPUs handling other tasks within the PCs events became diocer.Onobrad peripheralls themselves began to have bulit in [url=http://www.davidhabchy.com]barbour sale[/url] CPUs. CPUS in differenmt manners beagn to be found in such peripherals as hard drives, sound and video czards. <br /> <br /> <br /> The ovrall computer systrem may beconme [url=http://www.teatrodeoro.com/hollisterde.php]hollister deutschland[/url] much more efficient [url=http://www.ilyav.com/isabelmarant.php]isabel marant sneakers[/url] if these in essence peripheral CPUs can communicate directrly with each other. without having to use the main [url=http://www.maximoupgrade.com/hot.php]hollister france[/url] CPU as an intermediary. Hence MCA and EISA were developed with these roes in mind. The concept became knwn as bus mastetring. <br /> <br /> Bus mastering involkves the concept that the periphheral CPUS couuld requuest permission to take over the bus for a short period of time. The main CPU would grant permission for them to take over the [url=http://www.mquin.com/parajumpers.php]parajumpers pas cher[/url] bus, and it wopuld temporaliy drop out of the loop, enablinng sift communicaitons betwen for example the hard drie and floppy disk drvie. <br /> <br /> As comtper busess developed and had the inherent abilities to transfer more and more data in a giveen time preiod noies beccame an isuse. The ISA bus was fairly noies prone becauase it relied on triggered interrrups. Whnever the voltage leveel on the data line of [url=http://www.vivid-host.com/barbour.htm]barbour sale[/url] the bus exceeded a given threshold value then Edge Triggering woould resuult. <br /> <br /> The aplternnative to this stuation wherre Edge Triggering could resullkt is level triggering wehre it is required that the transmitting hold and archiev the higher votlage lveel in order for data to be recoginzeed by the devbices on the bus. Edge Triggering however can lead to transients that is brief power surges that can confuse the devices on the bus into thinkilng that data is on the bus when it is not. Luckily leevel triggeing lowwers the nooise lebvel and both MCA and EISA emloy it. <br /> <br /> As a resiult of all of theese inherent benefits MCA and EISA came to supporrt the idea, which we know take for granted, of innstant sotfware configurations. Tere were no switches or jummpers on add in MCA or [url=http://www.mquin.com/parajumpers.php]doudoune parajumpers[/url] EISA boards. 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