Thanks for the reply!
I am learning new things .
I think that from the 10 assorted chips I got from Ali, I have one like this, which should work, I think:
so, when the sockets arrive and the testing tool, I will test it and then see if it works in the toastrack.
I will update about the progress.
128K Toastrack Lower RAM Fail
Re: 128K Toastrack Lower RAM Fail
Hi.
I have finally received the memory modules and sockets.
I have socketed the first 8 modules, and tested them with the tester and they were OK.
Then I inserted the memory into the sockets, started the Tastrack, and got the same garbage on the screen.
On the third or fourth time while I was testing the voltages on the board I eventually got the picture. I started slightly pushing the chips down and all RAM chips did not have any effect. However, pushing the AY module crashed it.
I have to say that initially, my problems started after I tried to solder in the stereo mod onto AY chip + ULA and there is a chance I shortened something in the process. I was not sure what it was and diagnostics showed that one of the lower RAM chips are dead, so I took that as the best hint that the problem was there. Now I have figured out that it is not the RAM that is the problem. My bad, I should have noted the AY short incident in the beginning.
I am posting another question in a separate thread about AY chip, not to confuse with this thread about Lower RAM Fail:
https://sinclairzxworld.com/viewtopic.php?f=21&t=4492
I have finally received the memory modules and sockets.
I have socketed the first 8 modules, and tested them with the tester and they were OK.
Then I inserted the memory into the sockets, started the Tastrack, and got the same garbage on the screen.
On the third or fourth time while I was testing the voltages on the board I eventually got the picture. I started slightly pushing the chips down and all RAM chips did not have any effect. However, pushing the AY module crashed it.
I have to say that initially, my problems started after I tried to solder in the stereo mod onto AY chip + ULA and there is a chance I shortened something in the process. I was not sure what it was and diagnostics showed that one of the lower RAM chips are dead, so I took that as the best hint that the problem was there. Now I have figured out that it is not the RAM that is the problem. My bad, I should have noted the AY short incident in the beginning.
I am posting another question in a separate thread about AY chip, not to confuse with this thread about Lower RAM Fail:
https://sinclairzxworld.com/viewtopic.php?f=21&t=4492