You may be aware, but to add to your comment... Good ol' Z80s are still in active production as well, and you can buy a 20MHz chip in a DIP, LQFP, or PLCC pack

You may be aware, but to add to your comment... Good ol' Z80s are still in active production as well, and you can buy a 20MHz chip in a DIP, LQFP, or PLCC package. Anyone who is interested should check out the RC2014 and retrocomp google groups. Lots of discussion there, and there are a few people selling Z80 and Z180 computer kits. https://groups.google.com/forum/#!forum/rc2014-z80 https://groups.google.com/forum/#!forum/rc2014-z80 https://groups.google.com/forum/#!forum/retro-comp https://groups.google.com/forum/#!forum/retro-comp