DOSEMU

• If you don't want your home directory mapped as 'd', go into the autoexec.bat for the dos disk, and fix the lredir command
• If you want to add an image to be mapped when EMUDOS starts, add it to the $_hdimage command like this: $_hdimage = "/etc/dosemu/drives/c /etc/dosemu/blah.img" (no relative paths)
• The easiest way to create an image is to use the mkfatimage16 utility like this: mkfatimage16 -k 5000 > blah.img (makes a 5 MB image)
  • Then, run dosemu
  • Go to drive D:
  • do format d:
  • do sys c: d: to put FreeDOS on it
• exit DOSEMU by doing exitemu
• If you want to mount this with mtools, you must put a line in /etc/mtools.conf like this: drive y: file="/etc/dosemu/blah.img" partition=1 offset=128
  • you can check this by doing mdir y:. You should see your system files
  • you sort of can mount this with mount -o loop, BUT this is a hack...I skip the DOSEMU stuff and partition stuff.
    • losetup -o 8832 /dev/loop0 /etc/dosemu/blah.img
    • mount -t msdos /dev/loop0 /mnt/tmp/
    • (then to unmount) umount /mnt/tmp, losetup -d /dev/loop0
    • clearly, it is MUCH safer to deal with this from mtools

Making HD Images

• Making a raw 10MB disk
  dd if=/dev/zero of=disk.img bs=1M seek=10 count=0

• Make a DOS filesystem
  mkdosfs /tmp/disk.img

• Insert a boot sector into the disk image (copy the 446 byte bboot code from a booting system--floppy, for example)
  dd if=bootsect.img of=disk.img bs=1 count=446 seek=62 skip=62 conv=notrunc

• Mount the disk image and copy in all the necessary data
  mount -oloop /tmp/disk.img /mnt/tmp

Problems with Memdisk and booting disks I made

Had the same problem as this guy, who then very helpfully told me to roll back to memdisk version 2.11. Works!

-- MattWalsh - 13 Aug 2005