Interrupt Sharing for Personal Computer
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
In a personal computer system, several adapters share one interrupt line to an interrupt controller. Each adapter drives the interrupt line high via a tristate device when it has an interrupt request and supplies no drive otherwise. The controller recognizes this high interrupt signal and proceeds to service all interrupting adapters sequentially until the interrupt signal falls. As illustrated in Figs. 1 and 2, this disclosure is concerned with reducing logic and microcode complexity when multiple adapters share a single interrupt line. Fig. 1 shows several adapters or interrupt sources connected to an interrupt line which terminates at one input of an interrupt controller.