23 Jun
2012
23 Jun
'12
8:34 a.m.
On 22 Jun 2012 at 14:15, 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
There are several FPGA implementations of the Z80; the first one that
comes to mind is TV80 over at opencores.org in Verilog.
Back in the dark days, someone published an x80 CPU (probably 8080)
done in TTL; perhaps Microcomputing, Kilobaud, DDJ; I don't recall.
--Chuck