# Supplied media and the expansion

The earlier extraction, original-code comparisons and C++ implementation used
the October 1994 **Earthsiege 1.0** CD. The other supplied archives had not been
included. This audit closes that inventory gap and establishes separate
expansion installs. It does not extend the 1.0 gameplay comparisons to the
expansion executable.

Open [Editions & expansion](../analysis/releases/index.html) for the new mission
briefings and resource tables. Complete hashes, comparisons and structural
decoding results are in [report.json](../analysis/releases/report.json) and
[volumes.json](../analysis/releases/volumes.json). Reproduce them with:

```sh
.venv/bin/python tools/audit_install_media.py
```

## What was supplied

| Input | Contents |
|---|---|
| `Earthsiege.iso` | October 1994 English Earthsiege 1.0, our existing reference. |
| `Metaltech Earthsiege Complete - Source.7z` | `ESCD_SO.iso`, `ESMD.iso`, `DBSIM.EXE` and a short installation note. There is no source-code tree. |
| `Metaltech-Earthsiege---Expansion-Pack_DOS_EN_ISO-Version.zip` | Expansion CD as `ESMD.mdf` plus a 500-byte `ESMD.mds` descriptor. |
| `Metaltech-Earthsiege---Expansion-Pack_DOS_EN_Floppy-Version.zip` | Redistributed three-disk installer: `RESOURCE.000` through `.002`, `UNCHUNK.EXE`, setup files and distribution/scene files. No floppy images. |

Original archives remain intact. The complete bundle's images are now in
`install media/cd_1996_10/earthsiege.iso` and
`install media/expansion_cd_1995_03/earthsiege_expansion.iso`.
The loose executable and its instructions are in
`install media/expansion_patch_1995_04/`.

The base reissue's ISO label is `ESCD_SO` and creation field is 1996-10-11.
The expansion label is `ESMD`, publisher `DYNAMIX, INC`, application
`EARTHSIEGE MISSION DISK` and creation field 1995-03-21. Some contained files
have March 22 timestamps. Month-level folder names avoid claiming exact release dates.

The floppy ZIP stamps every member 1996-12-24. Those flattened dates do not
date the game build; its `1995_03` install name groups it with the matching CD
data. The patch's April 10, 1995 timestamp is present in both the bundle and the
original ESXPANPT ZIP.
The expansion README's opening `3/21/94` date conflicts with the disc and asset
dates and should not be used to date it.

## Duplicates and extra material

All **178 files** from the original CD occur byte for byte on `ESCD_SO.iso`.
Nothing is changed or missing. Its **402 additions** include a PDF manual,
Earthsiege 2, MissionForce: CyberStorm and Hunter Hunted demos, and Windows
setup/DirectX components. This is a 1996 compilation of the 1.0 game.

The filesystem is expanded in `extracted/cd_1996_10`. Its `ESSR10-1.PDF` is
identical to the supplied top-level `Earthsiege Manual.pdf`; the literature entry
links to that copy. PDF metadata identifies PageMaker 6.0 and Acrobat Distiller
2.1 for Power Macintosh. That describes manual production, not game compilation.

The expansion MDF has **65,872 Mode-1 sectors of 2,352 bytes**. Retaining each
sector's 2,048-byte user field at offset 16 produces exactly `ESMD.iso`,
including trailing sectors: **zero differing user-data sectors**. Shared SHA-256:

`fb29c26708548b5b926b041ec0f93841c2d41bbb9d0607d798f157587a9af913`

The ISO is the DOSBox copy. MDF/MDS remain in their original ZIP, without
retaining another loose raw-image duplicate.

## Expansion content

The full CD filesystem is in `extracted/expansion_cd_1995_03`. All **20
Earthsiege VOL archives, containing 4,274 member records**, are expanded
beneath `resources/`. This total includes inherited resources and localized speech.

- `SIMVOL0`, `ZONES`, `SPEECH`, `SIMVOICE` and `DETECT` volumes are unchanged.
  The CD's `SHELL0.VOL` has 14 changed members.
- `SIMPATCH.VOL` adds and replaces simulator assets. New HERC profiles name
  **Apocalypse**, **Diablo** and **Headhunter**. It includes `METEOR.DTS`,
  `RUINS` and `WASTE` scenery, replacement building/weapon meshes, cockpit
  data, palettes and world settings.
- `PSHELL0/1/2`, `PZONES`, `PZONES1` and `SIMLANG` supply shell changes,
  campaigns and localized text. Archive header priorities control overrides; the simulator selects mask 1
  and searches higher priorities first. See [SIMULATOR_VERSIONS.md](SIMULATOR_VERSIONS.md).
- `PZONES1.VOL` contains **37 version-5 missions**, each with English, French
  and German briefing/debrief programs. `BTLSET_1.DAT` lists three groups of
  eight campaign missions, `B1_C0_0A` through `B1_C2_7A`. Thirteen `S2_*` files
  supply single missions. Both filename alternatives at each campaign step
  match; that alone does not establish runtime progression rules.
- **13 additional HMPs** are present, none byte-identical to a base song:
  six `BATTLE4A/B` through `BATTLE6A/B` tracks and seven shell tracks
  (`BSHELLA/B/C`, `ECHO`, `TAU`, `TEXT`, `VICTORY2`).
- `PSPEECH`, `PFSPEECH` and `PGSPEECH` each hold 62 expansion speech records.
  New movies `MI_INT1.DFL` and `MECHVIC3.DFL` and their raw audio accompany
  inherited and localized base movies.

The expansion is fully catalogued in the main browsers alongside the original
edition. Model coverage includes 35 separate entries, 348 thumbnails, 19 HERC
assemblies and 112 loadout presets. All 37 missions have original constructed
starting scenes, including their expansion actors, buildings and terrain.
[Expansion catalogue and integration](EXPANSION_INTEGRATION.md) gives the complete
viewer inventory, executable checks, unresolved fields and C++ support.

The [supplied expansion manual](../Earthsiege%20Expansion%20Pack%20manual.pdf),
PDF pages 7-9 and 16-19, describes selectable **Battleset 2**, three campaigns,
one-way career transfer with optional HERC/salvage transfer, the new chassis
and Cybrid landing craft. It introduces **PBW2, EMP2, ELF2 and the plasma
launcher**, including EMP2's paired shots and limited plasma-projectile homing.
An [OCR reference](../literature/expansion_1995_03/manual-ocr.txt) is retained;
consult the scan for ambiguous text.

The expansion README says earlier Earthsiege patch files are included. It
describes corrected displayed weapon ranges without changed actual ranges,
additional input-device support and corrected movie speed without a sound card.

## Floppy package and executable builds

`extracted/expansion_floppy/payload` contains 22 files extracted by passing all
three compressed chunks, in order, to the **original DOS UNCHUNK.EXE inside
isolated DOSBox**. Its seven VOLs match the CD counterparts byte for byte,
including directory records and timestamps.

`GO.EXE` matches between CD and floppy expansion. Both floppy launcher files,
`ES.EXE` and `ESCD.EXE`, equal the CD's `ESCD.EXE`. The floppy installer removes
`ESCD.EXE` and uses `ES.EXE`. Its marker is `M1D` instead of `M1`.

Expansion speech and movie files are absent from the floppy payload. Installing
it over a CD base preserves base-game resources without mixing in the missing
CD expansion speech or movies.

| Simulator | Bytes | SHA-256 |
|---|---:|---|
| Base 1.0 | 730,581 | `e5fb35966f3c755106cbeff2cfc1f2aed496bed388edab8ea2c857779efec34a` |
| Expansion CD | 760,401 | `db430a7f313efe24bc4dd2a6bb432ea494d66e332e2a58a761c6f4028661d0a2` |
| Floppy package | 760,465 | `f55184162d29edefd5a668b1446750ff4aa694080397268221898ecdea0a1d65` |
| Bundled patch | 760,481 | `4baf81839bda89623aca8149860e25ba56d9e32d78cfa300d0ede3a5ff9c0208` |

The original `install media/expansion_patch_1995_04/ESXPANPT.ZIP` contains the April patch README
and an executable exactly matching the bundled patch. Its instructions describe
mission lockups, usually around Campaign 4, Mission 8. The initial audit missed
this archive; its README and batch file are now retained with the patch.

[The executable comparison](SIMULATOR_VERSIONS.md) traces the floppy scanner
correction, April effect-cleanup and radio fixes, expansion weapon behavior,
archive precedence and the optional 320x400 graphics layouts. Byte-complete
checks account for the initialized application differences between expansion
revisions. The floppy package's exact distribution provenance remains unknown.

## Comparison installs

`./run_earthsiege_dosbox.sh` displays a choice by default. `--list` lists IDs;
a name or number selects one directly. `--print-command` prints its mounts.

| ID | Contents |
|---|---|
| `cd_1994_10` | Existing reference install, unchanged by this work. |
| `expansion_cd_1995_03` | Separate base copy upgraded by the original CD installer. |
| `expansion_cd_1995_04_patched` | Separate CD expansion copy with the bundled simulator patch. |
| `expansion_floppy_1995_03` | Separate base copy with original UNCHUNK output and the floppy script's copy/cleanup steps. |

Each C: drive owns its `SIERRA/MTECH` directory. Expansion copies started with
fresh `CAR` contents from the base disc and inherited configured sound settings.
Expansion `BAR` data comes from its installer. CD variants mount the expansion
ISO; the floppy variant mounts the base CD for its inherited movie path.

The flattened floppy installer retains disk-change assumptions. After unpacking
disk 1, it could not find disk 2 from its source directory. The installation was
completed from the verified original UNCHUNK output, followed by `INSTALL.SCR`'s
cleanup, without modifying compressed data or the executable. Temporary path
aliases tried during that investigation were removed.

The 1996 reissue needs no duplicate install because its original payload is
identical. Its extra files remain available separately. Use the expansion UI's
**Options > Load Battleset > Battleset 2** to select the new content.

## Installation checks

All three expansion builds entered a Battleset 2 mission in isolated DOSBox:
CD campaign `B1_C0_0A`, floppy single mission `S2_RCN02`, and patched CD single
mission `S2_RCN02`. [Screenshots and retained launch files](../analysis/releases/dosbox-checks.json)
record the simulator hashes and scenarios. Test careers created in the new
installs were cleared after capture; the expansion selection remains saved.
The original install was not modified. These are launch smoke checks, not
whole-campaign gameplay comparisons or listening tests.

The browser's mission selection, briefing/objective display and resource counts
pass headless Chromium checks. All four launcher IDs and numeric choices produce
the intended mounts; a noninteractive invocation lists choices without launching.
The shared source-mission decoder still reads the same 75 base missions and
retains the same two legacy-layout exceptions.

## Remaining expansion work

1. Trace battleset selection, career transfer and archive precedence.
2. Compare the three simulator builds and identify their fixes.
3. Establish new weapon, enemy, environment and campaign behavior against
   original execution, adapting harness addresses to the expansion.
4. Add correctly assembled expansion resources to the main browsers, then
   implement and validate native expansion support.

The existing 1.0 comparisons retain their scope. They do not test these systems.