The Commodore 64 and PET are fairly similar systems. Other than a few memory location differences, many BASIC programs written for the Commodore 64 that don’t use graphics can run on a PET.
There is one caveat. The PET doesn’t relocate a saved BASIC program to the beginning of BASIC, like all of the Commodore lines after it. So if you find yourself trying to load a program on your PET written on one of its younger siblings, you may wonder why it loads, but you can’t find it.
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