I can't read the whole code on your photos so I don't know the speed code for most of the ST PROMs you have in there. I can tell you -15B6 means 150ns so these are much too slow to be used as PLAs.banman wrote: ↑Wed Jul 31, 2019 9:28 amThere is a varied selection of what I strongly believe are original 27512 EPROMs.
This will provide a good test reference for checking out the Glitch when I manage to get the oscilloscope up and running....
I think having a genuine ST 27C512 very similar to yours on hand will be a benefit when comparative testing on the same oscilloscope is run against the newer Knockoffs (fake) ST 27C512 90B1..B6's..FX1 from China.
My way of thinking is even if the oscilloscope isn't dead actuate at least all the results will out by the same margin. That is my guess anyway.....
They do have the correct form factor and country of origin.