Sol

Sol Corporation was run by Youichi Soki (曽木洋一), formerly of Orca [1] and TRY/Sonata/Human.

Sol programmers Takashi Hayatsu (早津隆志) and Junichi Kobayashi (小林淳一) went on to start X-Road in 2001. (They also worked for Doda.)

Research Methods: Actual mentions, hidden data, online resources (see Links), shared staff

Arcade

• SD Gundam: Psycho Salamander no Kyoui (sound?) (Banpresto)

Famicom/NES

• Daikaijuu Deburas (programming?) (JP Publisher: Data East)

Graphics?: Mic

• The Flintstones: The Rescue of Dino & Hoppy (programming, some graphics; under subcontract with Kyugo Trading?) (US/EU/AU/JP Publisher: Taito)
• The Flintstones: The Surprise at Dinosaur Peak! (some programming?) (EU/US Publisher: Taito)
• Hyokkori Hyoutanjima: Nazo no Kaizokusen (programming?) (JP Publisher: Yutaka)

Graphics: Mic; Sound: Light Link Music

• Karakuri Kengou Den: Musashi Road: Karakuri Nin Hashiru! (programming?) (JP Publisher: Yutaka)

Graphics: Mic?

• Snow Brothers / Snow Bros. (programming?) (US/EU Publisher: Capcom; JP Publisher: Toaplan)

PlayStation

• Cho-Nazo-O (programming, graphics) (JP Publisher: Emotion)
• Kurashi no Manner: Kankonsousai-hen (JP Publisher: D3 Publisher)

Planning: Bestmedia; Programming?: X-Road

• The Onigokko (JP Publisher: D3 Publisher) [2]

Planning: Bestmedia; Programming: X-Road; Sound: Studio Cliche

• The Sniper (JP Publisher: D3 Publisher) [3]

Planning: Bestmedia; Sound?: Studio Cliche

• Space Adventure Cobra: The Shooting (JP Publisher: Takara)

Sound: Studio Cliche

• Submarine Hunter Shachi / Submarine Commander (JP Publisher: Victor; EU Publisher: JVC)

Sound: Studio PJ

• Suzuki Bakuhatsu (JP Publisher: Enix)

Game Sound: Studio PJ

• The War Simulation: Hito no Tsukurishi Monotachi (JP Publisher: D3 Publisher)

Planning: Bestmedia; Sound: Studio Cliche

Saturn

• Fist (JP Publisher: Imagineer)

Modeling: Fifchil; Sound: Studio Cliche

• Seifuku Densetsu: Pretty Fighter X (JP Publisher: Imagineer)

Sound: Studio Cliche, Mint

Super Famicom/Super NES

• Aoki Densetsu Shoot! (programming, graphics) (JP Publisher: KSS)

Sound: USP

• The Flintstones: The Treasure of Sierra Madrock ([some?] programming) (US/EU/JP Publisher: Taito)

Some Sound: USP

• Hisshou Pachi Slot Fan (sound [driver?]) (JP Publisher: Planning Office Wada)
• Honkakuha Igo: Gosei (sound?) (JP Publisher: Taito)
• Janyuuki Gokuu Randa (sound?) (JP Publisher: Virgin)
• Kamen Rider SD: Shutsugeki!! Rider Machine (sound?) (JP Publisher: Yutaka)
• Seifuku Densetsu: Pretty Fighter (JP Publisher: Imagineer)

Sound: Mint

• U-Jin no Furi-Furi Girls (sound?) (JP Publisher: Planning Office Wada)

Links

• Gpara.com interview with Takashi Hayatsu (Japanese) (Internet Archive Wayback Machine)
• Developer Table entry (Japanese)