Well...

GB

  - Pokemon crystal

SNES

  - Tales of Phantasia (It's probably top 5 in best OST for SNES)
  - Donkey Kong series
  - FF Series
  - Terranigma   Some good tracks, like:
    - Evergreen
    - Sanctuary
   - Earthbound (not recommended but I do enjoy some tracks)
    - In winters there is a genius
    - Heartless Hotel
    - Megaton Walk
     Some notes, Many of the tracks here are actually pop music, (Even the Beatles!), but its been mashed so much its indistinguishable. theres a nice youtube video about it.
   - Super Mario RPG (And my name bookie is fantastic)
   - Street Fighter 2
   - Kirby
   - Sim City    (City is just 5/5)
   - Anything Mario really     (Kart, Bros)
   - Spider man Maximum Carnage
   - Tetris Attack ("Forest stage" is super chill)
   - Uchuu Race Astro Go Go
   - Tetris & Dr mario (I've listened to this so much, I'm 
  unsure if its good)
  - Tiny Toon Adventures: Buster Busts loose (A little zany 
  but I like a few)
  - Zombies Ate My Neighbors
    Last but not least is ZAMN, which has one of the best tracks for the SNES, Mars needs cheerleaders (and also Pyramid of fear). It is genuinely good

I could make a bigger list, but I think after PS1 and N64 costs too much CPU and you're better off getting nonchiptune.

Some Mentions

  - Layton (DS)
  - Saga Frontier 2 (PS1)
  - dot hack (PS2)
  - Megaman Battle Network Series (GBA)

Its strange, you have to dredge through so much chiptune to find some tracks so recommendations list are always nice.