The Z80 is still manufactured today and I was wondering whether there is any interest for a community or discussion group.
Did you know that the Z80 has different memory access timings for instruction fetches and standard memory accesses?
No, can you site a URL to see?
http://www.zilog.com/docs/z80/um0080.pdf
Page 8
That is the latest document from Zilog but beware! It contains transcription errors in its diagrams and text.
The Z80 also provides in-built Dynamic RAM (DRAM) refresh support which limits its performance.
Later Z80 derivatives can run without DRAM support
The first of these is the HD64180 where one can tune or even turn off DRAM support for improved performance.
Even later Z80 derivatives have single cycle instruction fetch.
