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Looking for: HP 545a logic probe HP 547a current tracer Please PM if you have either of these you could sell me. Thanks in advance!

Yes, 74ALS245, my bad. Thanks for the clarification.

Question.... Are U21, U23, U25 74ALS125 as indicated on the silkscreen or 74HCT245 as indicated on the BOM document?

Looking for the L-shaped PCB set for a Midway Space Invaders, working or not. Have a nice looking original cabinet for it and don't want it to go to waste. Please PM me. Thanks!

Looking to get a set or any of the individual pieces of the HP logic tools: 545a logic probe 546a logic pulser 547a current tracer 548a logic clip Please PM if you have any of these you could sell me. Thanks in advance!

How would changing 74HCT374 from N to AN change the signal coming into the clock? This is from the inputs to pins 1 & 2 of U9, right? My U9-1 is always low so the HCT374 is never being clocked. HCT374AN/N is irrelevant to this. So Jameco has the parts that don't work, but where are the...

Hold the phone. I am using 74HCT374N instead of AN. What's the difference between them? There should be none, just TI ordering codes, right? Where are AN even available? Edit: Doesn't look like the HCT374 are even being clocked up to the point I'm at, so I don't think that's my timeout problem.

I'm using 100R for RN1, which is what you had suggested. I scoped the clocks at the Z80, 6532 and LS367 and they're fine. Sadly, I don't work on arcade boards so I don't have anything lying around that uses 6532 that I could test in.

San Diego... I have the base unit of that tester, but not sure I would get any other use out of that blade than this one time use.

Can someone sell me a known good 6532? I tried my luck with a lot of 5 Chinese ones. One was shorted and with the remaining 4 I'm getting the pod timeout message. Only thing I'm not certain is good is the 6532. Thanks!