HJ W E L C O M E T O O S / 7 8 ! The DECstation is a complete computer system, capable of editing, compiling, and assembling an unlimited variety of scientific, industrial, business, and educational programs. Sit back and enjoy a three-minute demonstration of the DECstation Operating System, OS/78. Control of the DECstation will remain under control of OS/78 in BATCH mode for the entire time, so don't try to type anything.