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Old 1st Jan 2018, 2:49 pm   #4
Dickie
Octode
 
Join Date: Sep 2004
Location: St. Albans, Hertfordshire, UK.
Posts: 1,477
Default Re: 8085 processor questions

If the crystal is just connected between two pins of the processor (X1 and X2) with no other driver chippery then it will be at a fairly high impedance and the act of scoping it may be enough to stop oscillation. You may be better looking at the "CLK (OUT)" pin on the processor.
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