Scientific Data Systems/Xerox Data Systems developed several operating systems for the Sigma series of computers, such as the Basic Control Monitor (BCM), Batch Processing Monitor (BPM), and Basic Time-Sharing Monitor (BTM).
Scientific Data Systems/Xerox Data Systems đã phát triển một số hệ điều hành cho loạt máy tính Sigma, như Basic Control Monitor (BCM), Batch Processing Monitor (BPM), và Basic Time-Sharing Monitor (BTM).