General Instrument's AY-3-8910: three square-wave channels, one noise generator, and a single envelope shared between them. It ran audio on the MSX, the ZX Spectrum 128, the Amstrad CPC and the Atari ST, and its Yamaha-licensed twin sits inside the YM2203 and YM2608 as their SSG section.
Zone 5150 (5st.BGM)
Tsuyoshi Sekito · Space Manbow
Parallel Space (4st.BGM)
Tsuyoshi Sekito · Space Manbow
Aquarium (3st.BGM)
Yuko Kurahashi · Space Manbow
Providence (2st.BGM)
Tsuyoshi Sekito · Space Manbow
Hydra (Normal Boss)
Tsuyoshi Sekito · Space Manbow
Battle Ship (1st.BGM)
Tsuyoshi Sekito · Space Manbow
Beyond the Darkness 2 (Opening 2)
Tsuyoshi Sekito · Space Manbow
Beyond the Darkness 1 (Opening 1)
Michiru Yamane · Space Manbow
Disappearance (Game Over)
Tsuyoshi Sekito · Space Manbow
Memoire (Ending)
Yuji Takenouchi · Space Manbow
Moan (Final Boss)
Tsuyoshi Sekito · Space Manbow
Brilliance (8st.BGM)
Tsuyoshi Sekito · Space Manbow
Psychopathy (Warp Demo)
Yuji Takenouchi · Space Manbow
Fire Warning (7st.BGM)
Tsuyoshi Sekito · Space Manbow
Dust-Dust-Dust (6st.BGM)
Tsuyoshi Sekito · Space Manbow
Frequency 140.85 (Alert Mode Level 1 Part 1)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
First Instruction Part 2 (Opening Transceiver Demo)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
First Instruction Part 1 (Opening Transceiver Demo)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Zanzibar Breeze (Opening BGM 2)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Theme of Solid Snake (Opening BGM 1)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
The Front Line (Alert Mode Level 1 Part 3, alternate)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Frequency 140.85 (Alert Mode Level 1 Part 1, alternate)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
"A" Jam Blues (Radio Mode BGM 2)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Swing, Swing (Radio Mode BGM)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Disposable Life (Game Over BGM)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Afterimage (Player Killed BGM)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Farewell (End Demo 2)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Red Sun (End Demo 1)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Return
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Escape
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Big Boss (Conversation Demo)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Tears (Conversation Demo <Gray Fox>)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Phantom (Boss BGM 4) [temp.]
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Flight into Enemy Territory
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Spiral (Battle on the Spiral Stairs)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Zanzibar Land National Anthem Part 2
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Zanzibar Land National Anthem
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Metal Gear D (Entrance Jingle) [temp.]
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Mourning (Conversation Demo <Tragedy>) [temp.]
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Ambush (Bridge Attack) [temp.]
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Wavelet (Conversation Demo <Sorrow>)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Reprieve of the Doctor (Sewer)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Infiltration (Alert Mode Level 1 Part 9)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Nightfall (Conversation Demo <Holly, 3 People>)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Insecurity (Holly Is Captured)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
The Front Line (Alert Mode Level 1 Part 8)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Mechanic (Boss BGM 3)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Battle Against Time (Boss BGM 2)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Under the Cloud of Darkness (Alert Mode Level 1 Part 7 & Nighttime Infiltration BGM)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Chasing the Green Beret
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Return to Dust (Alert Mode Level 1 Part 6)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Level 1 Warning (Alert Mode Level 1 Part 5)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
An Advance (Conversation Demo <Suspense>)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Killers (Boss BGM 1)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Shallow (Alert Mode Level 1 Part 4 & Swamp BGM)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Imminent (Alert Mode Level 1 Part 3)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Advance Immediately (Alert Mode Level 1 Part 2)
Konami Kukeiha Club · Metal Gear 2: Solid Snake
Level 3 Warning (Alert Mode Level 3)
Konami Kukeiha Club · Metal Gear 2: Solid Snake