> Ideas wanted: PIC-to-PIC comms at speeds greater than 1Mbit/s ?

Hope you don't mind some more questions:

[1] What type of data?  What error rate is acceptable?  Delivery failure
    rate?

[Michael Coop]  8 bit random content
No errors... (!) - I don't have a spec on the acceptable error rate, but I
think we can get by with pretty high 'losses', as this is a non-critical
'commercial' application.  Bits inverted are more acceptable than bits
lost, and preferably single bits rather than runs of 'n' adjacent bits.

[Michael Coop]  Delivery failure cannot happen, as each pic takes it's cue
from the preceding unit's data, and as such 'pushes' the data stream
through nn linked pics.

[2] Can the transmitter re-obtain any data that the receiver didn't get, or
    is such data "gone" permanently [in which case data must get through
    first time]?

[Michael Coop]  First time is the only time - bad luck.

[3] What sort of electrically noisy environment?

[Michael Coop]  Located alongside electric rail lines (about midway between
the overhead catenary supply and the undertrain motors, air-cond etc)

Thanks for the interest.  The problems from EMI may not be as severe as I
fear - but I just want to get there before the hardware is cast in stone.

Regards
MC

P.S.  If you think you are on to what we are doing, it's too late - the
patent application is already in <g>.