How to wire up multiple Z80 PIO chips?
I've never built a Z80 computer (or any other) but have had to explain basic micro-computer operation to maintenance personnel and I found this schematic very useful. With a little study you should be able to find a variety of clever techniques and tricks the designer used to get the most out of the limited number of address lines available.

Figure 1. The Z80 computer. (Click to enlarge.) Source: Z80.info.

The linked article and schematic are worth a read.


  Is there a standard way of achieving multiple PIOs being controlled by the Z80?


Again, I have no expertise in this area but I imagine that every trick possible was used to get the best out of these devices.