Shonman

Thanks for the quick response. I'll keep my eye out for non-working C64. Not sure I've got the heart to dismantle a working one.

Hi, I've recently discovered the joy of a Vectrex ownership, and have been trying to resurrect another machine which has issues. (I should add that I have minimal knowledge of electronics/computing/soldering etc. to guide me on my way) The symptoms are that the display is corrupt i.e. broken lines jumping around, otherwise all is good. I'm pretty sure the power board is ok having cross checked it with a working machine, none of the adjustments help, I have swapped over the socketed chips, checked for burnt components or bad solder joints, and replaced the caps on the logic board. Still no joy, same problem. So I was thinking about replacing the soldered-in ram chips since I guess this could be a bit rot problem (?) The installed chips are MCM2114-C30, which I believe are 300ns ones. Could anybody tell me which 2114 chips would be compatible ? e.g. could I use MM2114N chips which are 450ns ? Is the vectrex sensitive to the ram speed ? Any advice appreciated, even just to tell me I'm barking up the wrong tree. Regards, J