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PC-98 Gallery
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Hi! I created this site to bring together everything related to AlammoFM: Nineight, NecVGM, online emulators, and more.
Newsletter
PC-98 Gallery
Announcement
Hi! I created this site to bring together everything related to AlammoFM: Nineight, NecVGM, online emulators, and more.
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OPNA Dreams [PC-98]
OPNA Dreams — A night inside the YM2608
OPNA Dreams is a short doujin adventure game for the NEC PC-98 about FM synthesis and the beloved YM2608 (OPNA) sound chip. One night, one dream, a chip who talks.
Play OPNA Dreams online (PC-98 emulator)
Click the screen to start: browsers keep sound off until you click. Open full window.
👉 Play OPNA Dreams on itch.io — runs in your browser, or download the .fdi disk image for a real PC-98 or an emulator.
OPNA Dreams
- Title: OPNA Dreams
- Release Year: 2026
- Platform: NEC PC-98 (PC-9801VX class, 86 sound board) and web browser
- Developer: Alammo
- Genre: Educational adventure (ADV)
- Play Time: ~15 minutes
- Languages: English, 日本語, Català, Español — all on one disk
- Sound Chip: Yamaha YM2608 (OPNA), music through the PMD driver
- Features: 11 cards to collect, a final quiz, jukebox, gallery, save/load
What you learn
Each chapter is a dream, and the sounds are the lesson: every demo is a tiny PMD song with a voice built for the point being made.
| Chapter | Where | Teaches |
|---|---|---|
| Prologue | An attic, 2026 | How to play; what a sound board is |
| Dream 1 | The dark; Stanford, 1967 | Sound is a wave; vibrato sped up becomes FM |
| Dream 2 | Hamamatsu | Operator, carrier, modulator; level, ratio, envelope; build a bell |
| Dream 3 | Inside the YM2608 | OPN vs OPNA; algorithms, feedback; SSG; rhythm; ADPCM |
| Dream 4 | A composer’s desk, 1993 | MML and drivers; a song in layers; the musicians’ tricks; the quiz |
| Ending | Morning | Cards, score, credits |
How it was made
- Engine: ADVS98, a PC-98 visual novel and adventure engine for the web.
- Graphics: PC-98 Paint, all in one 16-colour palette. The oscilloscope strips are the FM formula plotted with the same ratios as the sounds.
- Music: OPNAVOID, written as MML and compiled for PMD.
More PC-98 games
Looking for more? Search the PC-98 Games Library: every game in the NEO98 online emulator, searchable by name, ready to play in your browser.
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