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Commodore 64 becomes remarkably more efficient by adding memory to it. Then the worst slow-down, incredibly
slow disk drive, can be worked around by using a part of the memory as a RAM disk.

Attached is a PDF on how to add memory to the Commodore 64.

In 1986, when the original article was written, there were no commercial memory extensions for sale in Finland.1
Of course there were some in the USA, but they were quite useless, as they had only 64 kB of memory, and the
price was high as well. When built by oneself, the following memory expansion should have costed 300–400 Finnish