I was playing throughPC Kid 2 yesterday, got to stage 4, and then left it on while I went out, and got back to it about 4-5 hours later. There has to be a better way of doing things, but I don't know about the various options.
AFAIK, there are ~4 different options:
Tannenoki Bank
Memory base 128
Shuttle backup unit
CD ROM units I believe have some kind of memory for saves?
How do all these things work? Are they only for games that support saves?