ok, SO, tell me if you want me to re-jig this for a 74xx138. Here is the wiring using 74xx32, I used a 20 pin socket so I could switch to a 16V8 later if I wanted.
This approach also needs an inverter later, so 74xx04 or a transistor like 2N7000 :]
Give me some feedback and I'll customize.

Here is the rom wiring. Blue pins are 1:1 to z80
/cs goes to A15 (0000-7FFF is a repeat of the rom)
The purple lines are next post.

ok, install the z80 with power, and pullups on these signals (their the inputs), connect CLK and /RESET.
Blue connections get shared with the 28C64 1:1
I will come back with more

I just have to work out how to phrase a schematic, I think what I'll do is pinouts of the chips with the bus connections, I dont usually draw out the whole thing. If you get the z80 and eprom in, and powered, leave room for ram but we dont need it yet.
erm,

oops that comes with a free video...

hah, conductive adc touch :]
"lick fingers and make selection"

yes! I forgot to subtract 512 from the ADC reading to make it signed!!!!

if I can get this to work, well, you see, I have these old broken wheelchairs...

NiMh or Lion?

AWESOME, ok I will make you up a schematic that fits that!

aha! I had to scroll back a year!
These memory chips? (the 8464A is SRAM)

hey wait, I got two of those! I want to try!

maybe try during the day?

hey were did you go? give me the memory part numbers you have!

ok! so, here is what I want to know!
- how big is your EPROM (27512?)
- how big is your ram (6116 / 6164?)
- ok, you have an 8255, do you want hardware serial? (I think you had a xx51 comm chip?)

"yes!" uh, what chips did you want to connect and I'll cough something up for you :] If you have a pin on the attiny85 do reset control to, you can leverage the really good brownout circuit built into the tiny85!