T1EXPL.TUT Tutorial which explains TUTOR.COM (Version 4.50). T2KEYOLD.TUT The original keyboard (function keys on the left). T3HIST.TUT Brief history of computers. T4TERM1.TUT Introduction to computers, binary numbers and the CPU. T5TERM2.TUT Introduction to storage and input/output devices. T6DOS1.TUT Disk Operating System operation and commands. T7DOS2.TUT A tutorial on subdirectory structure and commands. T8BATCH.TUT Batch file commands and structure explained. T9PROG.TUT A brief introduction to structured programming.