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I have streamlined Stan 's version by adding the definitions of this type for each selected pin: Once you have decided on the Arduino pin you want to use, this selector will automatically return the appropriate PORT and BIT. In the program, use something like this: I also connected one of the remai...

They are TMS4164 -20 NL, date code AP8432 They seem to be genuine, rubbing with IPA and acetone did not reveal anything. They are obviously second hand with solder marks on their pins small scratches here and there. Oh, and I confess, I bought them for a Sinclair Spectrum and testing them on it. 😊 ...

They are TMS4164-20NL, date code AP8432
They seem to be genuine, rubbing with IPA and acetone did not reveal anything. They are obviously second hand with solder marks on their pins small scratches here and there. Oh, and I confess, I bought them for a Sinclair Spectrum and testing them on it.

While we are at it, another question: I have a set of TI 6154 chips I bought from China, they are not fakes, but they are used (pulled from old boards) These chips all test fine with this tester, but they cause intermittent errors when I use them in the computer. Someone said they may be somewhat &q...

if I put a 4164 and test it as 41256, it still passes OK, and strangely it also takes as long as a real 41256. Shouldn't it sort of "hit a wall" and return an error when the address incrementing loop goes over XA7 and come to a non-existent XA8 bit? I suspect what you're doing is testing ...

Hello all, Came across this forum and topic while searching for an easy solution with Arduino to test DRAM's. Seemed like what I need, so I built it. It's working and it can identify bad chips that I have. I am relatively new to Arduino and by no means a programmer, I could only make heads and tails...