Hello z80 with arduino

[DrDiettrich]

@younggoo

where REFSH and M1 RESET BUSRQ WAIT BUSAK WR RD
AND INT NMI HALT MREQ IORQ in arduino ?

An Arduino does not have most of these pins. Connect to GPIO pins and write code to generate all signals as expected by the Z80. Also write code to emulate required Z80 peripherals (UART...)