> Aaargh. You don't happen to be refering to the Cirrus Logic macrocell
> of the Psion Series *5*?
> 
> The 5mx is an ARM 710 T. I don't know anything about the Revo or
> 5mxPro etc. The Series 7 is based on a SA core, but it has the same
> serial port interface as the 5mx (which is accessed through direct
> "memory" IO with IRQ notification AFAICS).
> 

The Series 5 was based on the Cirrus logic 7110 (IIRC).  This contains an 
arm710 core (no 'T').

The series 5mx was based on a custom chip designed for Psion and based on 
the arm710t core.

I'm not certain, but I think the Revo is based on the same chip as the 5mx.

I think the series 7/netbook are both based on the SA1100 chip


R