Where is the transmission dipstick located on a 1990 Toyota Camry?

The 1990 Toyota Camry does not have a transmission dipstick. Automatic transmissions in that era and model typically check transmission fluid level indirectly through a specific port or by removing a specific bolt, often requiring a specific procedure and sometimes a special tool. You cannot check the level with a dipstick like you would with engine oil. Consult your owner's manual for the correct procedure.