On 3/29/17 2:14 PM, David Bridgham via cctalk wrote: > And I think this picture is the smoking gun. > > http://pdp10.froghouse.org/qsic/pic_24_2.gif > > Again, the bottom trace is the CS signal in question and the upper trace > is now one of the QBUS DAL lines (after the bus transceiver and level > converter) that's running across the ribbon cable near the CS signal. > It does appear that induction can make a fairly clean square wave. > >
simple thing to try is split the ribbon cable between the two signals
