Similar is https://stackbit.com/. I've used it to make my React website visually editable so my marketers could have a WYSIWYG.

DOS = disk operating system for anyone curious

disk = an obsolete long-term storage medium, in case anyone was wondering

storage medium = what people used before we all ascended to the cloud, in case anyone was wondering

wondering = what we used to do before the internet, if anyone was curious

HN is not turning into reddit at all.

Yeah, pretty cool to see a photo of that. It was coded in assembler, first for the MOS Technology 6502 microprocessor used in the Apple II.

True! Bob Frankston actually worked super hard to get VisiCalc's code to fit inside 16KBs so it could be used on the lower-end Apple II. But he couldn't make it happen. So it only ended up as usable on the more expensive $2,500 Apple II

Nowadays, they'd just cut features from the 20KB version to make it fit into 16KB and sell it as the Standard edition (and sell the full 20KB one as the "Premium HD+" edition).

That'd be pretty cool, not sure how many people might want that too, but an interesting thought!