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P.S. The NSX ECU uses 2 I/O controllers - the first, like the Legend - is mapped to C000-C01F and the second is mapped to E000-E01F. This is why the NSX decoder circuitry is different. I have a theory for the reason the NSX ECU has 2 (identical) I/O controller chips (of which I've only partly verified): One is assigned to LOW cam and the other is assigned to HIGH cam. The processor updates both of them constantly, regardless of VTEC engagement. When VTEC is engaged the processor simply selects which I/O controller is active and hands off control to the injectors. I think this is done so that the VTEC handoff is nearly instantaneous.-Matt
P.S. The NSX ECU uses 2 I/O controllers - the first, like the Legend - is mapped to C000-C01F and the second is mapped to E000-E01F. This is why the NSX decoder circuitry is different. I have a theory for the reason the NSX ECU has 2 (identical) I/O controller chips (of which I've only partly verified): One is assigned to LOW cam and the other is assigned to HIGH cam. The processor updates both of them constantly, regardless of VTEC engagement. When VTEC is engaged the processor simply selects which I/O controller is active and hands off control to the injectors. I think this is done so that the VTEC handoff is nearly instantaneous.
-Matt
