Sega AI Computer

The system's defining physical interface was a large touch surface built into its sloping upper deck. Rather than a general-purpose digitizer, this surface was designed to work with swappable overlay sheets — each software title shipped with a custom printed overlay that transformed the touch area into a task-specific interface. For example, the Japanese-language learning software provided an overlay with all phonetic syllabary characters (hiragana), allowing young children who couldn't use a keyboard to compose text by tapping characters directly. Other overlays presented piano keyboards, maps, picture selection grids, and drawing canvases. For older children and adults, a full-sized keyboard could be placed on top of the touch surface, converting the machine into a conventional computer.

The Sega AI Computer featured a built-in microphone for speech recognition. Its speech capability was supported by two dedicated 128KB ROM chips: one containing samples for the 46 common sounds of the Japanese language, the other containing pre-recorded full sentences for system prompts. The ADPCM speech decoder could mix synthesized speech with PSG sound (SN76489 chip), and when equipped with the optional Sound Box peripheral, FM synthesis via a Yamaha YM2151 chip. Audio cassettes could play narration and music during software loading, with one stereo channel carrying data at 9600 bps and the other carrying audio — allowing background music during load operations.

The system's AI capabilities were powered by a Prolog interpreter stored in ROM — jointly developed by Sega and CSK Research Institute (CRI). According to a July 1986 Electronics magazine article, 'Sega Prolog was developed jointly with CSK Research Institute, the AI lab of software house Computer Services Corp.' The Prolog interpreter was used by application software for natural language processing, though it was not exposed to end-users for programming. The diary application was the showcase demo: a child would answer prompts about their daily activities with one- or two-word answers, and the Prolog system would generate a grammatically correct diary entry. The system could also 'parse a user's natural-language inputs and evaluate the person's ability level,' adjusting difficulty accordingly rather than simply advancing one level at a time. BASIC and Logo ROM cards were available for users who wanted to write programs.

The system was built around a 16-bit NEC V20 CPU (an enhanced Intel 8088 clone in CMOS) running at 5 MHz, with 128KB of RAM and 512KB of ROM distributed across multiple chips: two 64KB system ROMs (operating system + Prolog), two 128KB speech ROMs, and one 128KB character ROM. Video was provided by a Yamaha V9938 (MSX2-compatible, 256×212 resolution) with 64KB VRAM. Software loaded from Sega My Cards (128–256KB) or stereo cassette tapes. The system included an RS-232 Centronics printer port, an 8-direction D-pad with 3 buttons for game-style navigation, and optional peripherals including a keyboard, floppy disk drive, Sound Box (YM2151 FM synthesis), and a planned but unreleased 'Bridge Unit' with an 8-bit CPU for MSX compatibility.

At least 26 software titles have been preserved, spanning four series: Kumon Wonderschool (fairy tale adventures teaching math and logic), Ongaku Wonder School (music composition), English Wonder School (English language learning developed with Linguaphone Institute), and Surasura Moji Wonder School (Japanese literacy). An additional 10+ titles are referenced in flyers but have not been found. Software was released from August 1986 through at least May 1989 — an unusually long lifespan for such an obscure system. The machine was sold primarily to Japanese schools (unit markings reference the Aomori Minami Hoikuen nursery school in Tokyo). A 1986 Copel 21 magazine order form priced the system at ¥87,500, with the full Kumon Wonderschool set available in 17 installments of ¥9,990. The marketing materials described the system as 'equipped with artificial intelligence' and capable of 'expanding the possibilities.'