Opry99er Posted November 22, 2015 Share Posted November 22, 2015 (edited) Are there any differences between the various 74LS245 chips available on eBay? I found 30x for $6 USD shipped... Just want to make sure they will be drop in replacements for my gear. Edited November 22, 2015 by Opry99er Quote Link to comment Share on other sites More sharing options...
Fritz442 Posted November 22, 2015 Share Posted November 22, 2015 I've seen a few different manufactures and they all seem to work ok make sure to get some 244's also Quote Link to comment Share on other sites More sharing options...
Opry99er Posted November 23, 2015 Author Share Posted November 23, 2015 Thanks. Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted November 23, 2015 Share Posted November 23, 2015 You definitely want to have some 244s on hand along with the 245s. Any manufacturer will do, so long as they are 74LS or 74ALS (and 74HCT will also probably work fine). Most of your data lines are going through the 244s, with the control lines going through the 245s. 1 Quote Link to comment Share on other sites More sharing options...
Opry99er Posted November 23, 2015 Author Share Posted November 23, 2015 Thanks... When I get them, I may tear everything I own apart and replace chips... Gotta eliminate these demons infecting my machine. Quote Link to comment Share on other sites More sharing options...
Willsy Posted November 23, 2015 Share Posted November 23, 2015 Be very very careful when desoldering. My advice would be to cut the old chips out. Then, turn the board over, and, from the solder side, apply heat with the iron, melt the solder, and pull the pin out from the component side. When you've done that, the hole in the board will probably re-flow with solder. No problem, apply heat again, and go in with the solder sucker. Don't use that braid shi*t! I've always done it this way and never borken a pad/trace. In fact, to remove chips/components, I actually add new solder! I re-solder the hole, and pull the part out while the solder is hot, then go back in again with the solder sucker and suck the solder out. 1 Quote Link to comment Share on other sites More sharing options...
Stuart Posted November 23, 2015 Share Posted November 23, 2015 You definitely want to have some 244s on hand along with the 245s. Any manufacturer will do, so long as they are 74LS or 74ALS (and 74HCT will also probably work fine). Most of your data lines are going through the 244s, with the control lines going through the 245s. Other way round. Data goes through the LS245 as it is bidirectional. Address and control lines go through the LS244s as they are unidirectional. Quote Link to comment Share on other sites More sharing options...
Opry99er Posted November 24, 2015 Author Share Posted November 24, 2015 Is there room in there to socket the chips? In 20 years I may need to do this again Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted November 24, 2015 Share Posted November 24, 2015 You could always get the flush style sockets (basically pins), but they might not fit into the current holes. I haven't pulled one apart lately to look at the clearance though. It might work--and it might not. Quote Link to comment Share on other sites More sharing options...
Opry99er Posted November 24, 2015 Author Share Posted November 24, 2015 I don't want to let this card die... Flex cables are not exactly like Parsec carts... I already have two 32k cards to diagnose and repair, on top of replacing faulty 9918s in two consoles... Might as well set up a TI M*A*S*H unit over here.... Quote Link to comment Share on other sites More sharing options...
Willsy Posted November 24, 2015 Share Posted November 24, 2015 Is there room in there to socket the chips? In 20 years I may need to do this again Yes there is. Certainly in the console, and, from what I remember, in the flex interface too. Quote Link to comment Share on other sites More sharing options...
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.