I have found it very hard to find info on the N8T97B. What is the difference between the N8T97B and N8T97N? Are they interchangeable on the Apple 1?
Anonymous
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Can't tell you without a datasheet... but during my search I found this....
http://www.weisd.com/Mobile/MobTop.php?PN=N8T97B
not sure if it's a 100% equivalent... but that's worse when seeing the price. So it might be an option.
Update:
According the following link the replacement as well as the N8T97N should work for you.
https://vetco.net/products/nte6887-ic-3-state-hex-buffer-inverter
Can't say for sure without seeing the exact data sheet for the specific part, but the last letter is often the package type, with N often standing for plastic DIP. B might be ceramic DIP, but that is more conjecture than anything. Keep in mind it varies with manufacturer and over time.
regards,
Mike Willegal
Thanks for the replies. I can’t seem to find a good data sheet for the B, so if anyone does, please link it.
For historical records I will paste the compatibility info that tokabln found:
NTE Part Number: NTE6887Description: IC-SCHOTTKY HEX HI SPEED
This part is the equivalent replacement for the following:1820-1884, 3841045, 5A-8989, 8T97, ECG6887, F5887PC, MC6887, MC6887L, MC6887P, MC8T97, MC8T97L, MC8T97P, N5887N, N8T97, N8T97B, N8T97F, N8T97N, NTE6887, SK9700, SK9700/6887
Both the B or N will work, so will a 74367 chip. In fact when I test 8T97 chips with my TTL tester, they are detected as 74367 chips.
Both the B or N will work, so will a 74367 chip. In fact when I test 8T97 chips with my TTL tester, they are detected as 74367 chips.
I've had issues with 74*367 chips. Some of them will work, some may have issues in a heavily loaded machine with lots of cards in it.
Ok, I'm confused. There generally is the most two cards in an apple-1, the ACI and something hanging off the edge connector like a basic PROM card. Or do you mean when you use 74367 chips in an Apple II series.
Woops, sorry, yes, substituting 74LS367 for 8T97 in an Apple II can be problematic, I totally missed that this was about an Apple 1. I don't know if the speed/load issue that is encountered on the Apple II is a problem for the Apple 1. But it definitely isn't a 100% exact substitute. I think I was able to get either 74S367 or 74H367 to make it work in a ][+, but it is better to use an 8T97 if you can.
Many years ago (about 40) our electronics lab's Apple II computer failed. I traced to the problem to the 8T97 chip. I looked that the pinout and found that it matched a 74LS367. I got one at Radioshack and it worked!