Author Topic: Sys 80 Non CPU boot/IRQ issue  (Read 3446 times)

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Offline MartyJ

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Re: Sys 80 Displays
« Reply #15 on: May 10, 2009, 08:56:52 PM »
I am tending to agree now, although initially I thought it was OK...

I've got my Chinese "Faithful" brand logic probe....

According to the 3 lines of documentation 1(red) led = high, 0(grn) led=low and pulse(yellow)=pulse.  No audio on this one...

I will start again via the Pinrepair guides for the CPU....Although my first play with the logic probe I thought was OK...

For example on the upper leg of the crystal, I get all three lights - so if I am understanding it correctly it is going high, low, high, low, high, low (pulsing)???

I would much prefer one with the lcd screen....