Hi!
On Feb 24, 11:52 am, Steven wrote:
<--- snip --->
> It is mildly difficult to find 20Mhz. Z80 chips in a 0.6" 40-pin DIP package.
> There's a Chinese supplier on eBay who has them from time to time and they
> can perhaps be special-ordered from Digi-Key or Mouser.
Future Electronics apparently has them in stock. The catalog
number is Z84C0020PEG.
Willi