Hi Tony... the OP problem has moved on is not about leds or resistors now its about how to get a Z80 to read 65,000 NOP's !
As far as I can see the 16 address bits are stuck .. possibly all at 1's ...
Still here ... I have the Z80 pensioner under PIC control, signals more or less as DS ... the Reset ( PIC generated) shows how first instruction fetch is achieved ,(M1 & Read ) the wait (PIC generated ) allows control over memory access. just in the process of designing a better control circuit... ( Bus Pirate is ace )
Z80 clock at +- 20khz
HE if your reset switch bounced during or after zero state , or not low for the 3 clocks , then Z80 = unknown state ?
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