I don't see any pullup resistor on the BA line
A pullup is not necessary, because this signal is already driven by BA.
This is not the case for "your" DMA-Line, it's undriven.
A first sight would lead to the opinion, that the BA/AEC-designpart
in the schematics is a misscontruction, because it doesn't let you
act like a VIC on the bus. But this is not true, due to the fact, that
the VIC is unstopbable and the BA-Signal has several jobs like driving
a PLA-Pin etc. And just pulling the BA down ruins the whole bus timing.