Lister erases Holly's memory of Agatha Christie so that he can enjoy rereading them (having already read every book ever written).
Year of feature (shown above)
There are quite a few Commodores in episodes of Red Dwarf. Always makes me smile to see them there.
Weird that I was about to post a very similar comment only to see that (another - I'm hoping!) Chris already posted it... Or did I post it and someone has used a C64 to erase my memory...?