On 6/22/2012 5:15 AM, Dennis Yurichev wrote:
Hi.
I'm looking for any information related to Z80 CPU internals,
microcode, sequencer, etc.
Is it possible to rebuild it in Verilog/VHDL/TTL on breadboard with
all that undocumented instructions, etc?
Here is what I found so far about machine cycles, but obviously, it's
not enough:
http://www.msxarchive.nl/pub/msx/mirrors/msx2.com/zaks/z80prg02.htm
Also I belive I read many moons ago, that the Z80 also used the internal
bus capacitance to hold values to be outputted on the external address bus.
Ben.