[BBC-Micro] What CPU is in the second processor?

[Jonathan Graham Harston]

Is there a way that a program running in the I/O processor can
determine the CPU of the second processor?
 
It's not as obvious as checking the ROM type of the current
language, as a language may not have been selected yet, or a 6502
language may have been selected and the second processor has code
to check for this and select alternative code, as the ARM CoPro
does if 6502 BASIC is selected.
 
-- 
J.G.Harston - jgh at arcade.demon.co.uk - mdfs.net/User/JGH
05:10:36, 18-Nov-2008 - RISC OS time rolls over to &5000000000