On Wed, 6 Dec 2006, Sergei Shtylyov wrote: > I'd say they *only* looked consistent then. :-) Some user tools may rely on certain strings seen in /proc/interrupts ("procinfo"?). > As for the I/O APIC, I think i82903AA was "the reference design" for it... Nope, it was the i82489DX -- the original "discrete" coupled Local & I/O APIC using a five-wire inter-APIC bus and a protocol different from later implementations. Then there were ones included in the i82379AB (SIO.A) and i82374EB/SB (ESC) chipset components. They used a three-wire bus and a new protocol. And only then came the i82093AA. Maciej