how were super/not very/normal effective different in GEN1?

Question

for example, bug type attack did super effective to poison type

Answer 1

Bug and Poison types used to be super effective against each other, Ghost used to do nothing to Psychic types, and Ice used to do neutral damage to Fire-types.

Source: http://bulbapedia.bulbagarden.net/wiki/Type_chart

Comments

it's funny because the gen1 chart says that dragon types do super effective to each other,
when there is only 1 dragon type attack, dragon rage that will always do 40hp attack