non-CP/M Z80 board

[Roy J. Tellason]

I'm thinking about building a z80 board,  with varying amounts of "stuff" 
attached,  with RAM and ROM that may be NMOS or CMOS,  and some indeterminate 
number of Z80-family and compatible peripheral chips.

My question is this:  At what point do you _need_ to have address and data bus 
buffer chips?

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
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Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin