NES Dragon Warrior I version differences?

[Artlover]

Ok, I have an early Dragon Warrior cart for my NES. I played it alot. Now, down in the SW area of Alefgard, where the metal slimes live, I almost never encountered metal slimes. Maybe 2 or 3 times in an entire game.

 

Recently, I've been it via Emulation using FCE. Now, there are two dumps; prg0 and prg1. I'm playing with the program 1 version. I noticed that I encountered metal slimes a lot. I mean, dozens of times. Once 3 times back to back.

 

So I'd like to know why the slime difference. Did they change that in the revision? Or maybe it has something to do with running on an EMU vs the real thing?

[nester]

I don't know, I seem to recall running into quite a few metal slimes on the old Nintendo version. Perhaps it's just a coincidence.