Z80

What is the memory addressing limit for a subject?
Are there subject or instruction system-compatible chips that carry a clock speed of 40-80 mhz and higher?

Goodbye.

Z380 seems to reach up to 50 MHz. There is a larger bit capacity, plus its own
additional commands, in addition to the standard ones. However, it seems, according to conversations,
it works crookedly with undocumented commands, and the timing of some
teams differs from the Z80.

True, there is a Z84C15, used on the Sprinter and overclocked to 21 MHz.

--
Timonin Maxim.