Ok i suppose it was along time since i played this on amiga, and i know that is EOB1 (or it was EOB2), i could check an item (to see for example which has better damage), but can' t figure ow to do that. Am i mistaken and in EOB1 there was no such possibility you can just guess? It won't make any sense then (RPG where You can't compare items?).

You are not mistaken: there is no information about weapons' damage or armors' protection level in the game, neither in the manual.
However you can take a look at the clue book that GOG provides: consider that both weapons' and armors' statistic are taken from AD&D core rules.