What's the most represented system in your VGM collection?

[The Gambler]

Considering only full OST releases, no concept / image / doujin / arrangements of sorts. Also no sample / promo soundtracks which contain just some tracks and not the full OST (for example, I didn't count my SMT Strange Journey bonus cd).

After a doing some quick statistics, I got

28 full soundtracks for PS2 games I own / have played;
26 PS1 (less than half however is original music composed for PSX; the rest are straight-from-arcade conversions);
15 famicom;
13 Megadrive;
8 GBA;
8 DS;
8 PSP;
only 5 Gameboy OSTs (why they don't release more GB music on cd?);
4 SNES (this was a shocking truth to discover...);
3 PS3;
3 PCE DUO (real OSTs releases: not counting the redbook audio in-game);
2 SMS;

The criteria was: listing just OSTs of which I also own the original game: no sense in listing all the other soundtracks as well (the list would be completely different but also basically a clone of my collection list). Also, not counting SKUs, but OSTs: therefore "Akumajo Dracula Best 2" counts for three full osts: Castlevania IV, The Adventure & Belmont's Revenge. Same for games collections, so Gradius Deluxe Pack adds 2 OSTs (Gradius & Gradius II) to PSone total.

The choice not to include arcade games was deliberate, as most early arcades have very brief soundtracks: for example just the third disc of "220A-7721~3" would have net a whopping 32 arcade titles, and I felt this would have messed up my intent.