Emulator Version: Surreal 1.0
Rom Version: Zelda no Densetsu - Mujura no Kamen [j] [!]
Rom Settings: Default
1964:
After rescuing the Deku Princess, if you go to the left of the village, there's a Deku there that you chase. If you make it through the maze, you get the pig mask. W/ that, you get the blue medicine, and with that (later in the game) you get quite a bit of stuff. Well, the damn thing freezes when you walk into the maze. I tried different days, different masks, and different items. It either freezes, or best case scenario, you lose video. Either way, that part of the game is out.
EDIT: Added Rom Info
Also -- you can get the blue potion elsewhere I see after reading a FAQ... just have to do it another way.