[protomyth]

The Smalltalk used in this demo was my personal favorite (-78)

Is there a document that shows the differences between The Smalltalk-78 and Smalltalk-80, and what made Smalltalk-80 worse?

[abecedarius]

Wish I knew! One difference is that -80 had metaclasses. (They weren’t in -76 but I’m not sure about -78.) I’d say metaclasses are more complication than they’re worth.

[pavlov]

I think Smalltalk-80 was adapted to be portable to non-PARC systems: only standard ASCII, only Unix-style file system, etc.