I recently replaced a broken DRAM chip on one of those! https://blog.qiqitori.com/2022/02/testing-a-zx81-ram-pack-with-an-arduino/ https://blog.qiqitori.com/202

I recently replaced a broken DRAM chip on one of those! https://blog.qiqitori.com/2022/02/testing-a-zx81-ram-pack-with-an-arduino/ https://blog.qiqitori.com/2022/02/testing-a-zx81-ram-pack-wi... (this is more about finding which one is the broken one than about the actual replacement) The one I had doesn't seem very wobbly though. Maybe there is some variation between production runs etc.?