Err... The crosspoint switch is the C004. The C012 is
related to the
C011, and is a transputer link adapter to a normal computer bus. It's a
bit like a UART for transputer links (and the normal computer side looks
awfully similar to a DEC DL11 ;-)). 
Oops, boy is my face red  :-)  I meant it used the one specific to the
T9000 which I don't remember off the top of my head.  I guess I will have
to look it up to get further info (is may be the C104 or such).
Ram