aguyandhisappleii Posted December 27, 2022 Author Share Posted December 27, 2022 1 hour ago, MarkO said: That can lead to the 74LS125 being Blown Up... I ALWAYS, remove the Disk ][ Controller and turn Upside Down, to plug in the Drive "correctly".. This I learned to do after Blowing Up 2, of the 74LS125s... The Clicking is the Apple ][ Power Supply, shutting down to prevent damage... MarkO Yes. I heard and am worried about that. When I get the chance, I'll open up the drive to see if I did indeed bust any chips. Since my Apple II was a non-autostart one, the drive never even spun even when I got it connected properly (I didn't issue the commands for accessing the drive - I also didn't know these older IIs don't automatically boot from the drive), so I'm hopeful nothing got blown up but I don't know if that's how it works. As for the keyboard, I'm going to buy a replacement for the encoder chip (an MM5740AAE/N) to see if that gets it working again. Since I have no other keyboards, chips, or Apple II hardware to test with, that's pretty much the best I can do. Quote Link to comment Share on other sites More sharing options...
MarkO Posted December 28, 2022 Share Posted December 28, 2022 On 12/26/2022 at 11:02 PM, aguyandhisappleii said: Yes. I heard and am worried about that. When I get the chance, I'll open up the drive to see if I did indeed bust any chips. Since my Apple II was a non-autostart one, the drive never even spun even when I got it connected properly (I didn't issue the commands for accessing the drive - I also didn't know these older IIs don't automatically boot from the drive), so I'm hopeful nothing got blown up but I don't know if that's how it works. As for the keyboard, I'm going to buy a replacement for the encoder chip (an MM5740AAE/N) to see if that gets it working again. Since I have no other keyboards, chips, or Apple II hardware to test with, that's pretty much the best I can do. Two sites you need to know about for locating Electronics are "Find Chips" and "Octo Parts".. Looks like there are plenty of replacements available... https://www.findchips.com/search/74LS125 BTW, did you ever get an account to Apple Fritter?? MarkO Quote Link to comment Share on other sites More sharing options...
aguyandhisappleii Posted December 29, 2022 Author Share Posted December 29, 2022 7 hours ago, MarkO said: Two sites you need to know about for locating Electronics are "Find Chips" and "Octo Parts".. Looks like there are plenty of replacements available... https://www.findchips.com/search/74LS125 BTW, did you ever get an account to Apple Fritter?? MarkO I was just going to buy the part on eBay since they’re only a couple bucks. Is that a bad place to buy it from? No, I never did, although it’s been a while since I last tried. Quote Link to comment Share on other sites More sharing options...
nick3092 Posted December 30, 2022 Share Posted December 30, 2022 Buying ebay chips from a seller that is not in China is probably safe. Or at least safer than buying say, Ali Express chips. Some sellers from China sell remarked/fake/bad chips. For chips that are still in production today (like many of the "LS" logic chips, I prefer to buy from a known electronics warehouse like mouser or digikey. 1 Quote Link to comment Share on other sites More sharing options...
MarkO Posted December 30, 2022 Share Posted December 30, 2022 On 12/28/2022 at 4:08 PM, aguyandhisappleii said: I was just going to buy the part on eBay since they’re only a couple bucks. Is that a bad place to buy it from? No, I never did, although it’s been a while since I last tried. eBay?? Not necessarily.. You can start there.. You should contact Apple Fritter again.. MarkO Quote Link to comment Share on other sites More sharing options...
MarkO Posted December 30, 2022 Share Posted December 30, 2022 5 hours ago, nick3092 said: Buying ebay chips from a seller that is not in China is probably safe. Or at least safer than buying say, Ali Express chips. Some sellers from China sell remarked/fake/bad chips. For chips that are still in production today (like many of the "LS" logic chips, I prefer to buy from a known electronics warehouse like mouser or digikey. My preference too, but eBay does favor the Buyer, so you do have a lot of leverage when buying things.. Jameco has the 74LS125s for less than a $1.00 each, but I believe you need a $5.00 order minimum.. MarkO Quote Link to comment Share on other sites More sharing options...
Keatah Posted December 30, 2022 Share Posted December 30, 2022 In the scheme of things I wouldn’t fret any price under $5 for these parts. Quote Link to comment Share on other sites More sharing options...
MarkO Posted December 30, 2022 Share Posted December 30, 2022 16 minutes ago, Keatah said: In the scheme of things I wouldn’t fret any price under $5 for these parts. With 74LS125s, you probably should have a half dozen or so, on hand... MarkO Quote Link to comment Share on other sites More sharing options...
Keatah Posted December 31, 2022 Share Posted December 31, 2022 I'm handling "spare parts for the future" by making sure I have several of each and every part on the motherboard. Easiest way is buying a few boards or complete computers and setting them aside. This is good for the custom chips and some discrete parts or the timing GALs. Of course if I pull from the spares then I have to refill it by buying it. But I don't have to put a fire out. The part goes on a list, and when it's convenient I buy it. Quote Link to comment Share on other sites More sharing options...
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