Basic rookie mistake: Displaying images in 16:10, not 4:3 which would be the size they would appear as on an actual Commodore 64 connected to a TV or monitor.
Oh, LIST-1050, list up to line 1050 and stop. It took me a while to see how the data for 40 characters was being turned into 1000 characters (answer: it wasn't).
Hmm, why did the author use Perl for convsion if they didn't know it? Besides of regex (which is everywhere albeit in different dialects), I don't think Perl knowledge gives you very much nowadays.
Perl is ubiquitous (installed on virtually every Linux system) and has had excellent backwards compatibility for decades. It’s hard to beat in that combined metric.
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