Photoshop didn’t come out until 1990. Before that we used complete bullshit.
Not gonna lie, even the early versions of Photoshop weren't great. They were just miles above anyone trying to compete.
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The first one I ever used was version 2.5. Most of my archived files are unreadable now because they didn’t have filename extensions.
I can't imagine the acrobatics the PSD file format has gone through over the years.