temporarily drop “out of the loop”, enabling swift communications between for example the hard drive and floppy disk drive.
As computer busses developed and had the inherent abilities to transfer more and more data in a given time period noise became an issue. The ISA bus was fairly noise prone because it relied on triggered interrupts. Whenever the voltage level on the data line of the bus exceeded a given threshold value then “Edge Triggering” would result.
The alternative to this situation where “Edge Triggering” could result is “level triggering” where it is required that the transmitting hold and archive the higher voltage level in order for data to be recognized by the devices on the bus. Edge Triggering however can lead to “transients” – that is brief power surges that can confuse the devices on the bus into thinking that data is on the bus when it is not. Luckily level triggering lowers the noise level and both MCA and EISA employ it.
As a result of all of these inherent benefits MCA and EISA came to support the idea, which we know take for granted, of instant software configurations. There were no switches or jumpers on add in MCA or EISA boards. Although we take plug and play instant configuration of mother boards and peripherals such as sound, video or network cards for granted it was not always that way. We owe a lot to these early computer innovations of improving the computer bus.
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Max RubinVintage Retro Computer Manualswww.adgerlinux.comwww.vintagecomptutermanuals.com
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