ColecoM - Speech Game Module

Manufacturer: ColecoM Speech synthesis expansion module for the Coleco ADAM / ColecoVision, connecting via the side expansion port (60-pin card edge with ribbon cable). Adds synthesized speech capability using vintage General Instrument speech synthesis silicon on a modern professionally-manufactured PCB. Key ICs (verified from board photography): SP0256-AL2 (General Instrument) — Allophone speech synthesizer. Takes phoneme codes as input and produces synthesized speech audio. The same chip used in the Mattel Intellivoice, Magnavox Odyssey² The Voice, and numerous 1980s speech add-ons. The “SAY” in the module name references this chip's function. GI sound/control IC (General Instrument) — Second GI chip visible, labeled “SOUND” on the silkscreen. Likely handles audio output amplification or additional sound generation. ISSI IS61LV256-15J — 32K×8 SRAM (256Kbit, 15ns access time) by Integrated Silicon Solution Inc. Provides speech data buffering or phoneme lookup storage. QFP microcontroller/CPLD (top left) — Handles bus interface, address decoding, and control logic for the speech subsystem. SN74-series logic (TI) — Additional address decode and control. Architecture: The ADAM's Z80 writes phoneme/allophone codes through the expansion bus to the SP0256-AL2, which synthesizes speech audio in real time. The SRAM provides data buffering for speech sequences. The “DIAGNOSTIC” label on the silkscreen suggests built-in self-test capability. Professional green PCB with silkscreen, solder mask, and plated through-holes — a modern production board using vintage speech synthesis ICs.