Have a Juno First on the bench:
Pin 11 Low (not marked on schematic)
14 pulse (AB8)
16 low (not marked on schematic)
18 pulse (inverted from pin 10 of the 81 custom)
27 pulse (ME anded output from the address decode pal when not selecting ROMS A,B or C)
More for posterity.
Wondering if I...