My question was not about a rs485 network. I never saw a well-working rs485 network of 42 NXTs where you can read and command all sensors of all kinds and motors exactly as if they were attached altogether at 1 single NXT.
(ok, I admit that you started beginning with a very promising appoach for this - but having to buy 42 NXTs and program and control them just as they all act together like 1 single one?? And 42 NXTs also would probaply cost a fortune, don't you think? - )
But anyway, my question was about all I/Os at only ONE NXT.
As we have 3 motor ports and need 15, so 12 are missing:
1 sensor port for a 12x NXT encoder motor multiplexer.
3 sensor ports are left for 40 required sensors:
to each remaining sensor port ONE 16x universal sensor multiplexer (for all kinds of sensors, either Lego or 3rd party or homebrewed, maybe 8-10 for i2c types (high speed read/write ), and another 6-8 for analog types).
OK, that would admittedly be a challenge - but really nice to have....
NXC CHESS for NXT: http://www.mindstormsforum.de/viewtopic.php?f=70&t=6790
indispensable for NXC + EV3-C: easy + trouble-free network & sensor+motor remote control for rs485, BT, USB!