This is the second edition of the Level II Basic Reference Manual for the TRS-80 Micro Computer System, printed in 1979 by Radio Shack, a division of Tandy Corporation. Published in Fort Worth, Texas, U.S.A., this detailed manual includes comprehensive programming references, such as arrays, arithmetic operators, and string functions. The book captures historical insights into early computing, emphasizing the practical functionality of the TRS-80 system.