It was in 89-90 when i got my A500. It's really said here already so i'll quote the next that match mine (with some edits

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I had a C=64 for quite some time. Then a friend of mine bought an Amiga 500 in about '89 or so, then I HAD to have one.
Texas Instruments -) C=64 -> A500 -> A2000 -> A600 / A1200