68kMLA Classic Interface
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| Resurrecting a few 128k/512k boards | |
| Posted by: IlikeTech on 2020-07-22 04:18:56 Also, please use sockets for swapping chips like this. Much less damage to the board if you have to make changes and makes finding bad chips much faster. | |
| Posted by: LaPorta on 2020-07-22 04:33:05 Yes indeed. I have a few clip-to-size sockets so it is easy. | |
| Posted by: LaPorta on 2023-04-18 04:00:37 Ok, so almost three years hence, I am back at this project. I have sold or traded most of the boards (including one for known-good RAM chips - thanks @Pushpull76 !). I desoldered that chip noted above and put in a socket. I sourced about twenty sockets, so I can theoretically replace them all. I still get nothing from the new chip, but I’m wondering if I a. Damaged all the RAM, or b. Have another issue with the board. Perhaps I should be scoping for signals, but I don’t know what to look for. | |
Posted by: Pushpull76 on 2023-04-18 12:26:39Ok, so almost three years hence, I am back at this project. I have sold or traded most of the boards (including one for known-good RAM chips - thanks @Pushpull76 !). I desoldered that chip noted above and put in a socket. I sourced about twenty sockets, so I can theoretically replace them all. I still get nothing from the new chip, but I’m wondering if I a. Damaged all the RAM, or b. Have another issue with the board. Perhaps I should be scoping for signals, but I don’t know what to look for. 💪💪💪💪💪💪💪 | |
| Posted by: LaPorta on 2023-04-18 15:23:19 Well, the analog board is fine: powered my spare, working Plus board without issue. Definitely an issue on the 128k. | |
| Posted by: Pushpull76 on 2023-05-10 15:07:37 It’s a thread opened by John for his 128k motherboards but, a few days ago, I exchanged with him some memory chips for a damaged one…so maybe it’s the right place to post my repair updates🙂 I basically desoldered all the memory chips to use sockets.   | |
| Posted by: LaPorta on 2023-05-10 19:04:41 Please do! I want to see your progress as well. | |
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