How to know if my E34 is computerized or not

[maxion89]

Hi guys, I still less knowing about computerized car or not. and my car is E34 1991 2.0 Manual. Someone tell me that if the car computerized it must be careful to handle (DIY repair) the car and even by unplug the battery can make the car need to be reset back. So what is this computerized car anyway, how we identify this car. Just need to add my knowledge about car.