I have 8085 CPU controlled Cushman CE6000 analyzer.
I am pretty sure the main controlling CPU board is not working properly.
For example the _W/R signal appears to be low all the time.
The problem is that I do not have easy access to the CPU board when installed so I am going to pull it out and test it with just power applied – no interface to the rest of the equipment.
Assuming that I have the processor clock running – what other signals can I use to check if the micro is actually working?
I only know what it suppose to do on power up – specific display on LCD after 10 seconds and I am not getting it. But the display works - sort off.
I should be able to trigger on CPU RESET.
Any help from 8085 guru would be greatly appreciated.