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Z-code - Just Solve the File Format Problem

Z-code

From Just Solve the File Format Problem
Revision as of 04:07, 28 December 2023 by Dexvertbot (Talk | contribs)

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File Format
Name Z-code
Ontology
Extension(s) .z1 .z2 .z3 .z4 .z5 .z6 .z7 .z8 .dat .zip

Z-code is an Interactive Fiction (IF) file format. A Z-code file contains a series of instructions for the Z-machine, a virtual machine designed by Infocom. A Z-code file typically contains an IF game which can be played using a Z-code interpreter. It is sometimes referred to as Infocom format. There are eight versions of Z-code. The first six were created by Infocom, while versions 7 and 8 were created by Graham Nelson, the author of Inform. Version 6 supports sound and images.

Infocom games were developed in the higher-level language ZIL, which was compiled into Z-code using a compiler that's apparently lost now.

Text within a Z-code file is represented using the specialized character encoding ZSCII, a variant of ASCII that is encoded for compactness and a bit of obscurity (nothing resembling normal ASCII strings is visible in a raw dump of a file, making it harder to cheat in games by seeing descriptions this way).

Z-code files can be packaged in Blorb container files along with other resources needed for the game, such as images and sounds.

Contents

Extensions

  • .z1 - .z8 (current convention, depending on what Z-code version the file is)
  • .DAT (used by Infocom for most of their commercial releases)
  • .ZIP (rarely seen, conflicts with the common extension used for ZIP compression)

Interpreters

A z-code game can be played on any platform that has an appropriate interpreter. Most interpreters can handle any Z-code version, although version 6 is not as widely supported as the other versions.

  • Frotz (cross-platform, open source, website)
  • Gargoyle (cross-platform, open source, website): can interpret multiple IF formats, including Z-code
  • GLUZMA (Glulx, open source; big-endian ZIP only)
  • Parchment (web, open source, website): browser-based Z-code interpreter.
  • Spatterlight (Mac OS X, open source, website): can interpret multiple IF formats, including Z-code
  • Twisty (Android, open source, website, Google Play)
  • Zoom (Mac OS X and Unix-like, open source, website) can interpret multiple IF formats, including Z-code.
  • ZORKMID (cross-platform, open source, written in C, include debugging functionality; ZIP only, supports big-endian and small-endan story files)

The IF Archive contains many other interpreters:

Other Tools

Sample Files

Information

Infocom documentation:

Personal tools
Namespaces

Variants
Actions
Navigation
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