Commandos: Behind Enemy Lines (demo)

Pyro Studios / Eidos, 1998. Playable demo with two missions (Baptism of Fire, Reverse Engineering). Registered as commandos_demo.

Fixture

Source: test/binaries/win98-games-a-d/commandos-demo-SWonly.exe, a WinZip self-extractor whose payload is the installed game (it carries InstallShield's DeIsL1.isu), so it is unzipped as is: unzip -q commandos-demo-SWonly.exe -d 'Commandos demo-SWonly/installed' (32 files, 41 MB), then node tools/gen-win98-games-a-d-manifests.js.
Comandos.exe (Spanish spelling) imports KERNEL32, USER32, GDI32, ADVAPI32, SHELL32, ole32, DDRAW, WINMM, mss32 (Miles, shipped as MSS32.DLL) and WSOCK32. Data: wargame.dir, DATOS\, OUTPUT\*.CFG, VIDEO\*.avi.
Software DirectDraw, 640x480x16 (dx slot 5 in --png captures).

Route (headless, worked first time with no emulator change, 2026-10-06)

Batch numbers at the default --batch-size, --quiet-api:

batch	input	screen
~0-300K	-	"Welcome to the playable demo"
300K	keydown/keyup VK_RETURN	main menu
460K	mousedown/up 315,162	New Game submenu
570K	mousedown/up 275,200	Mission 1 "Baptism of Fire" briefing (voice-over)
700K	keydown/keyup VK_ESCAPE	in mission: intro camera pan, then the map
880K+	mousedown/up 30,20 (first portrait)	Green Beret selected, camera centres on him, inventory panel
	mousedown/up 250,400 (ground)	he walks there, footprints in the snow, patrols move

Escape inside the mission opens the in-game menu (do not press it twice). A ground click at 320,330 right under the tree canopy did nothing visible; pick open snow. Use run.js --control --frozen + tools/ctl.js beyond the briefing: one 880K-batch scripted run takes ~80 s of wall clock.

Evidence: scratch/runs/20261006-commandos-demo-move.

Audio (CLI, data level)

Two DirectSound users, and the first one is a trap when measuring:

MSS32 (Miles) opens DirectSound in write-primary mode: CreateSoundBuffer with DSBCAPS_PRIMARYBUFFER (flags 0x1), 22050 Hz stereo 16-bit, Play looping. Its ring stays all zeros through menu and briefing; dumping it says nothing about whether the game has sound. Its service thread (mss32+0x12b0) is a WaitForSingleObject(event, 5) loop that services timers on each WAIT_TIMEOUT; it runs (~73K passes in 300K batches).
The game itself (exe+0x44a332 Lock, exe+0x449e00 Play) streams DATOS\BRIEFING\WAVE\MUS_BR01.wav (11025 Hz mono 8-bit) into a 32 KB looping secondary buffer (flags 0x180e0), refilled from guest thread tid 3 (ReadFile 4 KB chunks). Two more 11025 Hz voices carry the voice-over.

A guest thread's API calls only reach the log with --trace-api=NAMES ([API T1] lines); --trace-api without names prints none of them, so a census from the default log undercounts every streaming mixer.

Measured 2026-10-06: --trace-host=voice_play_ring shows the music voice refreshed 75,849 times by batch 760K; a dump of its ring at 750K has peak 1.0 and 91% non-silent samples. Real browser output, FPS and the browser route are not yet checked.