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In page VisiCalc:

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At VisiCalc's release, Personal Software promised to port the program to other computers, starting with those with the MOS Technology 6502 microprocessor,[3] and versions appeared for Atari 8-bit computers and Commodore PET. Both of those were easy, because those computers have the same CPU as Apple II, and large portions of code were reused. The PET version, which contains two separate executables for 40 and 80-column models, was widely criticized for having a very small amount of worksheet space due to the developers' inclusion of their own custom DOS, which uses a large amount of memory. The PET only has 32k versus Apple II's available 48k.[citation needed]