From the Sinclair ZX81 Operating Supplement:
Question: "My computer seems to be 'crashing' when I use the 16K RAM module, even though it never does when I use the computer alone. What can be the problem?"
Answer: "If the 16K is causing your computer to 'crash' after a few minutes of use, then you should try the following: Clean the contacts by vigorously rubbing the electrical contacts on the printed circuit board with a pencil eraser. Tape the RAM pack to the computer to prevent loss of contact due to accidental movement."
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