Eye of the beholder! Yup...that's the one.
Best I start looking for an a500 in the near future!
Welcome! Unless your friend had a 'big box Amiga', then it would 100% be an A500 (not A500 Plus). This A500 most likely had Kickstart 1.3 ROM, but could have also been 1.2.
Also, it's highly likely it was fitted with a 512KB RAM expansion in the trapdoor - This would give the machine 1MB of total RAM.
The good thing about Amiga's are their Video output - buy an Amiga scart cable from EBay and hook it up to a modern LCD or plasma TV (must have scart input) and the picture will be fantastic! I recently bought a new scart cable from seller 'cool-novelties' and it's by far the best cable I've ever bought.
If you're truly oldskool, get a 1084S or Philips 8833 or similar (I still have mine as it really is the best for fast moving games).