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).
Another computer that has a well thought out set of graphic characters is the Sharp MZ series.
The best part is that it’s all part of Unicode now and a lot of terminals and fonts support them.
This is awesome. I was just doing a deep dive on some forgotten C64 hardware (the PowerPad: https://archive.org/search?query=subject%3A%22Chalk+Board+In...) and love how many people are still hacking on these machines, they're so durable.
A nice C64 PETSCII gallery: https://tomseditor.com/gallery/browse?platform=commodore&for... (first of 44 pages)
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.
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.