 When Tandy introduced the TRS-80 Model III in 1980, they equipped the computer with TM-100s.The following year, Tandon obtained an even more lucrative contract when IBM released its Personal Computer.Until 1985, Tandon were the sole supplier of floppy drives for IBM PCs, initially the same single-sided unit used in the TRS-80, then the newer double-sided TM-100-2.