I received a dead CBM 2001 with 16k dynamic RAM, 40 chars and real keyboard in 2006. The 9'' screen was working but showed garbage. I had to replace the CPU and keyboard PIA. RAM was bad, so disabled on-board RAM and placed 32k static RAM on the memory expansion socket. I was able to enter a short BASIC program and run it. Since many keys did not work, I disassembled the keyboard and cleaned the conductive rubbers with alcohol. I learned that this is a bad idea indeed - even more keys were dysfunctional. I lost interest and put the box back on the rack where it slept until today.
I do not want to lose my mental health during COVID lockdown, so I decided to return to the Commodore box. Last week I ordered a bag of conductive rubber pads from the bay. I removed the old pads from the keys and glued the new pads in with silicone. The keyboard did not work at all. I had to replace the keyboard PIA (for the second time). Now the keyboard works like a charm. But now I am really lost: whatever I type after the BASIC prompt, as soon as I hit <RETURN> the machine falls into the monitor. I already checked the ROMS.
Has anyone seen this before?