Sorry, we were unable to sign you in.
Please check your email address and password.
Your last basket is still available
The basket of your last visit to Black Box is still available.
Would you like to view the products in this basket?
The Black Box website uses cookies. By continuing the use of the Black Box website, or by pressing the agree button on the right, you consent to the use of cookies on this website.
More information.
The high-performance PCI bus has both speed and interrupt-sharing advantages over the ISA bus.
The ISA bus implementation is based on edge-triggered interrupts. In computer electronics, everything is either 0 or 5 volts. Edge-triggered interrupts look for the transition (edge) from 0 to 5 volts or vice-versa. This makes it difficult to share interrupts because the PC may be busy when the transition (trigger) occurs. If so, the edge is not recognised and the request is not processed.
The PCI bus, however, provides level-triggered interrupts that see if the voltage is at 0 or 5 volts. Interrupt requests are always serviced no matter when they occur. This advantage means that a card in a PC bus will always outperform a similar card in an ISA bus.