+arcadeshopper Posted December 28, 2020 Share Posted December 28, 2020 I picked these up.. wondering if there's a best practice to test beyond stuffing each one individually in a 4/a and running ti diags. Greg 1 Quote Link to comment Share on other sites More sharing options...
fabrizio Posted December 29, 2020 Share Posted December 29, 2020 To test the tms9929, I use the ti99 with a zero insertion socket. 3 Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted December 29, 2020 Share Posted December 29, 2020 Looking at the markings, I suspect you may have issues with some of the chips in the left picture. Something feels just slightly off with them (they may be fully functional, but they are probably fakes). The group on the right doesn't give that vibe--but you won't know for sure until you test them. I like @fabrizio's solution. I may have to modify one of my spare consoles to support that (and look for a 64-pin ZIF to do the same with the CPU). Thinking on that I may actually already have a 64-pin ZIF around here somewhere. . .I think Burndy made them. 2 Quote Link to comment Share on other sites More sharing options...
GDMike Posted December 29, 2020 Share Posted December 29, 2020 "There embedded with ease dropping, file sharing, bank account grabbing, personal information grabbing, nuclear science and health technology grabbing "SPYWARE" ooooooooohhhhhhhh,. Then again, they just may be fine . Hehehehe.... I couldn't help myself... Lol 2 Quote Link to comment Share on other sites More sharing options...
cbmeeks Posted December 30, 2020 Share Posted December 30, 2020 I don't recommend testing in a real TI because if these are fake, there's no telling what pins do what. For all we know, it could have a dead short across VCC and GND. I recommend you check out Noel's video on testing possible fake TMS9918/29 chips. Basically, he just builds a small circuit that will generate a colored screen. If that works, good chance it's real and safe enough to test in a TI. 2 1 Quote Link to comment Share on other sites More sharing options...
+arcadeshopper Posted December 31, 2020 Author Share Posted December 31, 2020 so far they all seem to have the same basic resistance on the 2 sets of pins.. which is good. will have to build a test unit 1 1 Quote Link to comment Share on other sites More sharing options...
GDMike Posted December 31, 2020 Share Posted December 31, 2020 (edited) It's a great video, I'll have to do the same. Just to have it. Maybe make a permanent solution test board for my use. Edited December 31, 2020 by GDMike Quote Link to comment Share on other sites More sharing options...
fabrizio Posted January 5, 2021 Share Posted January 5, 2021 I use a ti 99 as a forklift to do some tests, for the micro I used a socket with a tulip pin, but if I find a zero insertion socket I try it ... As for the TMS9929 I bought 10 in china, they work everyone, incredible. While the first 5 purchased some time ago, only 1 worked .... 1 Quote Link to comment Share on other sites More sharing options...
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.