It's a Long Way to the Memory Top, Part II
This one really is a tough one to debug. At first, we suspected the VHDL code for the CPLD as the main error source, as VHDL is not our strongest suit. In fact, the decoder/banking logic is the first thing we ever really did in VHDL (apart from a few simple decoder equations the first days we were playing with GALs). As it turned out, the VHDL was not the main problem.