From: pete(a)dunnington.u-net.com On Dec 18, 0:37, pete@mindy wrote: Oops, I take that back :-) Although the Sorcerer manuals describe it as a Manchester encoder/decoder, what it puts on the tape is FSK. I just checked the schematic and circuit description. Dwight hasn't exactly described Manchester encoding either, though. Manchester encoding puts the clock transition in the *centre* of each cell, and the polarity of the transition determines whether it's a 0 or a 1. There's a phase shift at the cell boundary if necessary. His diagram *could* be Manchester encoding if you shift the 0s and 1s slightly to the left, except for the last bit. It should be (maybe 'd' for "down" and 'u' for "up" makes it more obvious): ___ _ ___ _ ___ |___| |_| |_| |___| -0- -1- -1- -0- -0- -1- d u u d d u It's too late at night here, for any more of this :-)

-- Pete Peter Turnbull Network Manager University of York