SYSTEM I/O APIC(SIO.A) AND

The 82378ZB System I/O (SIO) and 82379AB System I/O APIC (SIO.A) components are PCI-to-ISA Bus Bridge devices. These devices integrate many of the common I/O functions found in todays ISA-based PC systems-a seven channel DMA controller, two 82C59 interrupt controllers, an 8254 timer/counter, a BIO