This is a Soviet Mechanized Infantry Battalion Organization set in 1988. The only real difference between then and 1983 is the existence of the Automatic Grenade Launcher Section. It wasn't there in 1983. This is a very large pic, but I embedded a link so you can look at it in its own page and zoom in and out on it. This particular Mech Battalion has MT-LB, but a BMP Battalion has the same organization. A Motorized Battalion uses Wheeled vehicles instead of tracked vehicles. The primary Wheeled Armored Personnel Carrier of the time is the BTR-70 or BTR-80.
Here is the organization of the Regiment:
Motorized Rifle Regiment (MRR)
As you can see there are three MRBs and a Tank Battalion in the MRR. During most operations, the Tank Battalion, which has three companies will be broken down and each company is task organized into the three battalions.
Motorized Rifle Battalion (MRB)