{"product_id":"opn-opll-megamod-ym2203-ym2413-combo","title":"OPN+OPLL MegaMod - YM2203 \u0026 YM2413 Combo","description":"\u003ch2\u003eWhat is it?\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eOPN+OPLL MegaMod\u003c\/strong\u003e is a dual-chip music module combining the \u003cstrong\u003eYM2203 (OPN)\u003c\/strong\u003e and \u003cstrong\u003eYM2413 (OPLL)\u003c\/strong\u003e on a single MegaGRRL-compatible board. Plug it into your MegaGRRL and unlock authentic playback of \u003cstrong\u003eMSX-Music\u003c\/strong\u003e and \u003cstrong\u003ePC-88\/PC-98\u003c\/strong\u003e VGM\/VGZ format music — all from real hardware chips, not emulation.\u003c\/p\u003e\u003ch2\u003eWhy Was It Made?\u003c\/h2\u003e\u003cp\u003eIn 2023, the desire to play MSX-Music through MegaGRRL led to a collaboration between Denjhang (PCB design) and Natalie (firmware\/programming). After \u003cstrong\u003e5 iterative versions\u003c\/strong\u003e, the OPN+OPLL MegaMod was born — a refined, feature-complete module that handles the unique challenges of mixing OPN and OPLL audio with independent volume control and clean output.\u003c\/p\u003e\u003ch2\u003eWhat Makes It Special?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eYM2413 differential amplifier circuit\u003c\/strong\u003e with single 5V power supply — pure sound quality and high volume output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndependent volume potentiometers\u003c\/strong\u003e for OPLL, OPN, and SSG — fine-tune each sound source separately\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal master volume potentiometer\u003c\/strong\u003e for overall level control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSG stereo switch\u003c\/strong\u003e — freely configure stereo or mono SSG output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChip select signal indicator LEDs\u003c\/strong\u003e — simple visual feedback showing which chip is active\u003c\/li\u003e\n\u003cli\u003e5 versions of iterative development for refined, reliable performance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSupported Music Systems\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMSX-Music (OPLL):\u003c\/strong\u003e YM2413-based MSX music, FMPAC titles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePC-88 \/ PC-98 (OPN):\u003c\/strong\u003e YM2203-based Japanese PC music\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSG (PSG):\u003c\/strong\u003e Built-in 3-channel square wave from YM2203\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e VGM \/ VGZ\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChips:\u003c\/strong\u003e YM2203 (OPN) + YM2413 (OPLL)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOPN:\u003c\/strong\u003e 3-channel FM + 3-channel SSG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOPLL:\u003c\/strong\u003e 9-channel FM (or 6 FM + 5 rhythm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolume control:\u003c\/strong\u003e Independent OPLL \/ OPN \/ SSG + master\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSG output:\u003c\/strong\u003e Stereo switch on-board\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e Single 5V supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule format:\u003c\/strong\u003e Standard MegaGRRL compatible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndicator:\u003c\/strong\u003e Chip select signal LEDs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatible Systems\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMegaGRRL Desktop (hardware VGM player)\u003c\/li\u003e\n\u003cli\u003eAny MegaGRRL-compatible host\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Denjhang's Retro Hardware","offers":[{"title":"Default Title","offer_id":46179367289029,"sku":null,"price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0777\/8507\/1813\/files\/05_ddfb3c30-3917-4356-9515-c42f51b38175.jpg?v=1778035758","url":"https:\/\/denjhang.myshopify.com\/products\/opn-opll-megamod-ym2203-ym2413-combo","provider":"Denjhang's Retro Hardware","version":"1.0","type":"link"}