BOOT

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BOOT will start floppy images or hard disk images independent of the operating system emulation offered by DOSBox. This will allow you to play booter floppies or boot other operating systems inside DOSBox.

If the target emulated system is PCjr (machine=pcjr) the boot command can be used to load PCjr cartridges (.jrc).

Command line parameters

BOOT [diskimg1.img diskimg2.img .. diskimgN.img] [-l driveletter]

BOOT [cart.jrc] (PCjr only)

diskimgN.img
This can be any number of floppy disk images one wants mounted after DOSBox boots the specified drive letter. To swap between images, hit CTRL-F4 to change from the current disk to the next disk in the list. The list will loop back from the last disk image to the beginning.
[-l driveletter]
This parameter allows you to specify the drive to boot from. The default is the A drive, the floppy drive. You can also boot a hard drive image mounted as master by specifying "-l C" without the quotes, or the drive as slave by specifying "-l D"
cart.jrc (PCjr only)
When emulation of a PCjr is enabled, cartridges can be loaded with the BOOT command. Support is still limited.