Description
This is a small circuit that is able to test a Z80 CPU and 40 pins compatible Z80 CPUs.
The principle is really basic – the circuit has a very slow clock (less than 30Hz), and will execute the instruction NOP continuosly. NOP essentially waits 4 clock cycles and goes to the next address. Attaching a LED bar to the first 8 bits of the address bus, it will flash according to the current address. There is a RESET button to restart the test.
The circuit is powered by a included mini USB cable. It also includes a NEW Zilog Z80 CPU along with the circuit so you can play around.
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