Here is a full first run of the original Japanese version of Zelda 1. Aside from the obvious language difference (which, actually a lot of the game is in English) there is another notable change in this version of the game. The Famicom Disk System had more audio channels, which this game took complete advantage of. This means all those familiar tunes us English speakers remember are fuller sounding and have some extra flavor in there.
The rest of the game is more or less an unreadable version of our version, not too bad considering some of the bogus hints those NPCs can give anyway.