Some Lenovo (ex-IBM) maintenance utilities make an IBM-DOS bootable USB flash drive.
These USB flash drives are formatted with a FAT12 volume which boots to IBM DR-DOS via IBMBIO.com. Typically, they are in floppy diskette format (i.e. no partition table).
Under grub4dos, it is possible to boot from a FAT12 drive using:
The IBM DOS boot chain is:
IBMBIO.COM -> IBMDOS.COM -> COMMAND.COM
We can fix this by using FreeDOS boot files in the .imgPTN partition image or by making an image .IMA file...
These USB flash drives are formatted with a FAT12 volume which boots to IBM DR-DOS via IBMBIO.com. Typically, they are in floppy diskette format (i.e. no partition table).
Under grub4dos, it is possible to boot from a FAT12 drive using:
chainloader --pcdos /ibmbio.comHowever, if you convert the Lenovo USB flash drive to a FAT32 .imgPTN file and try to boot from it using E2B, you will find that it does not boot. The reason for this is that, unfortunately, IBM DR-DOS does not seem to boot from a FAT32 volume.
The IBM DOS boot chain is:
IBMBIO.COM -> IBMDOS.COM -> COMMAND.COM
We can fix this by using FreeDOS boot files in the .imgPTN partition image or by making an image .IMA file...