New compared to 1999 is the three-arm trigger which requires three hits above the low threshold and the Hi-Lo trigger which requires two oppsosite hits, one above the high threshold and the other above the low threshold. This trigger should be well suited for pi->e nu gamma events.
The labels on the inputs and outputs are in the form HnPm, where n is the header number (1...4 from top to down) and m is the pin number (1..16, as labeled on the unit).
Here is the toplevel schematic:
It contains the back-to-back logic:
here the three-arm trigger:
here the high-low trigger:
and finally the shapers:
The additional buffers at the output of the shapers are for signal delay.
