I just killed my crystal (which ain't a crystal per se but a "Ceramic
Filter") on one of my ZX81s
I know it is possible to replace that with a proper oscillator. Anyone got
a schematic and "proper" parts list.
I have tried to locate the appropriate replacement for that but to no
avail. (My Ceramic filter has no mention of manufacturer or anything
else). I have found two parts from ECS that kinda match (kinda being the
operative word) but I don't know which one would.