Hello. Maciej W. Rozycki wrote:
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.
Hm, that's news to me. I always thought that chip was external *local* APIC only... Well, there's no docs on it anyway.
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.
Aha, you're probably correct here. I forgot about those early chipssets.
Maciej
WBR, Sergei
