Crashedfiesta
Experienced Member
- Joined
- Apr 16, 2022
- Messages
- 82
Apologies if this isn't the right place for this, but it's about a tool I use on my vintage computers. 
I've acquired a 'cheapo' logic chip tester to test some of the logic chips in my Cifer CP/M machine and, by and large, I'm pretty happy with it.
But what I have noticed is that it consistently tells me that a couple of types of chips are bad, even though I've bought three independent batches of chips from different sellers on eBay. Specifically, 74LS01 and 74LS166 always come out as 'BAD'. Does anyone else have one of these and seen anything similar?
In the pics - I got annoyed at the wobbly display attachment so 3D printed something to bolt it to. And the 74LS126 was genuinely faulty after I managed to put it back in the Cifer the wrong way around - I'm constantly surprised by how hot chips can get and how quickly you can smell the heat when stupid things like that happen.
Thanks,
Crashed.
I've acquired a 'cheapo' logic chip tester to test some of the logic chips in my Cifer CP/M machine and, by and large, I'm pretty happy with it.But what I have noticed is that it consistently tells me that a couple of types of chips are bad, even though I've bought three independent batches of chips from different sellers on eBay. Specifically, 74LS01 and 74LS166 always come out as 'BAD'. Does anyone else have one of these and seen anything similar?
In the pics - I got annoyed at the wobbly display attachment so 3D printed something to bolt it to. And the 74LS126 was genuinely faulty after I managed to put it back in the Cifer the wrong way around - I'm constantly surprised by how hot chips can get and how quickly you can smell the heat when stupid things like that happen.
Thanks,
Crashed.
