The stock AIM 65 was offered with either 1K or 4K RAM,
I bought a 1K
and a guy I knew at Rockwell gave me the other 3K.
That RAM wouldn't happen to be in 2114s, would it? If so, I'd suspect
those early on, I've had more trouble with 2114s than with any other
chip. I've lost count of the number I've replaced (certainly the RAM in
my Commodore 8050, the video RAM in my TRS-80 Model 3, the RAM in my
HP82163 (HPIL video interface)...)
-tony