{"product_id":"omega-msx2-f4-fmpac-v3-2-fm-sound-module-denjhang-edition","title":"Omega MSX2+ F4-FMPAC v3.2 — FM Sound Module Denjhang Edition","description":"\u003cp\u003e\u003cstrong\u003eWatch the F4-FMPAC v3.2 in action:\u003c\/strong\u003e \u003ca href=\"https:\/\/youtu.be\/Mzm5bosZLHw?si=7Uf5i7W0Zu6STqVR\"\u003eVideo 1\u003c\/a\u003e · \u003ca href=\"https:\/\/youtu.be\/whf1tVl-ypA?si=tmBQYqhE7ouOT55f\"\u003eVideo 2\u003c\/a\u003e\u003c\/p\u003e\u003ch2\u003eWhat is it?\u003c\/h2\u003e\u003cp\u003eThe F4-FMPAC v3.2 is an FM sound expansion board for the Omega MSX2+ home computer, with a PCB originally designed and optimized by Denjhang. It adds FMPAC and MSX-Music (OPLL \/ YM2413) compatibility to the Omega MSX2+, unlocking FM music playback for MSX software that supports these standards.\u003c\/p\u003e\u003ch2\u003eWhat Makes It Special\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDenjhang's original PCB design:\u003c\/strong\u003e Optimized layout and dimensions tailored to the Omega MSX2+, with carefully separated digital and analog signal paths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned for production:\u003c\/strong\u003e 0603 resistors and capacitors on the back of the PCB help speed up assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAt-a-glance diagnostics:\u003c\/strong\u003e Red and yellow LEDs on the front indicate VCC and A.VCC status for quick power checks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCleaner analog layout:\u003c\/strong\u003e A common-mode choke isolates the digital and analog ground domains. Separate digital and analog signal paths and ground planes are designed to reduce interference and improve FM audio quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle 5V supply:\u003c\/strong\u003e Unlike v1\/v2, v3.2 does not need a separate +12V\/-12V supply or an LM7805 voltage regulator, simplifying installation and reducing power consumption.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefined FM audio:\u003c\/strong\u003e Drawing on the REBirth RE2-YM2413 sound card's differential amplifier circuit, the NE5532 helps cancel noise between the melody and drum outputs for cleaner FM sound. An LMV358 rail-to-rail preamplifier further refines audio output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable FM volume:\u003c\/strong\u003e An onboard potentiometer lets you tune the FM output level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFMPAC \u0026amp; MSX-Music compatible:\u003c\/strong\u003e Supports both FMPAC and MSX-Music (msxmusic) standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZ80 socket installation:\u003c\/strong\u003e Inserts via two pin headers into the Z80 processor socket. Remove the original Z80 from the motherboard and re-seat it on this board.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003ePower Requirements\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eF4-FMPAC v3.2 runs on a single 5V supply.\u003c\/strong\u003e No separate +12V\/-12V power supply or LM7805 regulator is required for this version.\u003c\/p\u003e\u003ch2\u003eBIOS \/ ROM Note\u003c\/h2\u003e\u003cp\u003eFor full software compatibility, the Omega system ROM must be reprogrammed to include the BIOS extension that enables FMPAC\/MSX-Music support. Without it, software that detects the FM extension will skip this module and use the primary FM system instead.\u003c\/p\u003e\u003ch2\u003eDifferences from F4-FMPAC v2\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSingle 5V power supply instead of requiring ±12V; no LM7805 regulator\u003c\/li\u003e\n\u003cli\u003e0603 resistors and capacitors on the PCB back for faster assembly\u003c\/li\u003e\n\u003cli\u003eFront red and yellow LEDs for VCC and A.VCC status\u003c\/li\u003e\n\u003cli\u003eCommon-mode choke and separated digital\/analog signal paths and ground planes\u003c\/li\u003e\n\u003cli\u003eNE5532 differential audio stage, adjustable FM volume, and LMV358 rail-to-rail preamplifier\u003c\/li\u003e\n\u003cli\u003eNo ROM socket on the PCB\u003c\/li\u003e\n\u003cli\u003eNo cartridge slot signal connections\u003c\/li\u003e\n\u003cli\u003eLayout and sizing optimized for Omega MSX2+ by Denjhang\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProject Credits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eF4 schematic by Kamil Karimov (2011)\u003c\/li\u003e\n\u003cli\u003eFMPAC Light schematic by Jipe (2010)\u003c\/li\u003e\n\u003cli\u003eBoard and optimizations by RBSC (2016–2018)\u003c\/li\u003e\n\u003cli\u003ev2 design by MSXmakers\u003c\/li\u003e\n\u003cli\u003ev3.2 original PCB design and optimizations by Denjhang\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eAssembly Reference\u003c\/h2\u003e\u003cp\u003eAssembly instructions for v2 are available on the msxmakers.design.blog F4-FMPAC project page. Note that v3.2 uses 0603 components on the back and has different power requirements.\u003c\/p\u003e","brand":"Denjhang's Retro Hardware","offers":[{"title":"Default Title","offer_id":50586939916485,"sku":null,"price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0777\/8507\/1813\/files\/352818EE-053F-4C38-B95C-3738130660C0.jpg?v=1790666062","url":"https:\/\/denjhang.com\/products\/omega-msx2-f4-fmpac-v3-2-fm-sound-module-denjhang-edition","provider":"Denjhang's Retro Hardware","version":"1.0","type":"link"}