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notes/on-beyond-docs.txt
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@ -3,7 +3,7 @@ A san inc hack 2018-02-21
---------------------------------------
A ProDOS port of Infocom's Z-Machine
interpreter for the 8-bit Apple II.
interpreters for the 8-bit Apple II.
~
@ -52,7 +52,34 @@ interpreter|suffix |filetype|auxtype
Z5 | .Z5 | $F5 | $8005
Z5U | .Z5 | $F5 | $8055
...TODO explain Z5U
Astute readers will notice that there
are two interpreters available for Z5
files. Z5 was an evolving format while
Infocom was making games. Years later,
Graham Nelson et. al. would reverse
engineer the format and write a real
specification. Modern authoring tools
targeted this specification, and modern
authors created an order of magnitude
more games with these tools than
Infocom ever published themselves.
We are left in a peculiar state, where
Infocom's own Z5 interpreters are "non-
standard," despite them inventing the
format in the first place. (To be
precise, the "standard_interpreter"
library variable returns 0, which may
cause some games to complain or even
refuse to run.)
On Beyond Z-Machine! includes two Z5
interpreters. The first, labeled "Z5",
is highly compatible with all classic
Infocom games and many modern games.
The second, labeled "Z5U", has better
compatibility with some modern games
that use advanced Z-Machine features.
~