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Boot process with boot manager on diskette

When a diskette is booted the first sector of the diskette is read and executed. Normally this sector would be the boot sector of an operating system. Now the first sector of the diskette contains the first part (LOADR-US) of the boot manager Boot-US. When executed, LOADR-US loads the main part of the boot manager (BMGR-US) from diskette and starts this main part (BMGR-US).

From this moment the boot process is identical to the boot process where the boot manager is installed on a primary partition. Thus the user selects one of the configured partitions and the boot manager loads and executes the boot sector of this partition. This will boot the corresponding partition.