Vanessa,

> Reading the code I again noticed "Squeak V3" as name for the old bytecode
> set. Always wanted to know: Where does the "V3" nomenclature come from?

It was the format for the planned Squeak 3.0:

https://wiki.squeak.org/squeak/750

> What's V1 and V2?

They were never named, but you could consider the original Squeak to be
V1 and the one with Morphic in it to be V2, but I don't think there are
any significant changes between them.

But please note that the V3 effort was abandoned, so in practice VI3 is
essentially the original Squeak image format.

> And should we consider Sista to be V4, or treat it as completely unrelated?

There was a VI4 effort, also abandoned, that is linked from that page:

https://wiki.squeak.org/squeak/2119

But Eliot's efforts to add closures did get adopted (third time's the
charm!) and yet it only got new image version numbers and not a new
name. So it is a VI3 format that doesn't match the previous meaning of
the term. Since none of those matter any more it is just odd but doesn't
actually cause any confusion.

What is confusing is the use of the term both for the image format (VI3
x Spur) and the bytecode set (VI3 x Sista).

In any case, the 3 in VI3 was originally associated with the transition
from Squeak 2 to Squeak 3 and makes no sense in this Squeak 5 (soon 6)
era.

-- Jecel