1 /* BSDI README.booting_dos,v 2.2 1996/04/08 19:32:18 bostic Exp*/
2 /* $FreeBSD: src/usr.bin/doscmd/README.booting_dos,v 1.3.2.1 2000/06/29 23:47:28 ps Exp $ */
4 To install DOS on a pseudo hard disk under doscmd:
6 1) Create a .doscmdrc with at least the following:
8 assign A: /dev/fd0.1440 1440
9 assign A: /dev/fd0.720 720
10 assign hard boot_drive 80 2 2
12 You may need to adjust the raw files for the A: drive to match
13 your system. This example will cause the HD drive to be tried
14 first and the DD drive second.
16 Note that you should only use raw devices or files at this point,
17 do not use a cooked device! (Well, it would probably be okay
18 for a hard disk, but certainly not the floppy)
20 boot_drive should be the file name of where you want your bootable
21 image to be. The three numbers which follow "80 2 2" say that the
22 drive will have 80 cylinders, 2 heads and 2 sectors per track.
23 This is the smallest drive possible which still can have MS DOS
24 5.0 installed on it along with a config.sys and autoexec.bat file.
26 You might want to create a larger boot drive.
28 The file boot_drive must exist, so use the command touch to create
31 2) Insert a floppy disk into the A: drive which is bootable to MS-DOS
32 and has the commands fdisk, format and sys on it. You should also
33 copy the file redir.com onto the floppy by either mounting it
34 with the msdos file system type or by using mtools.
36 (i.e. mwrite redir.com a:)
40 4) At the > prompt type "fdisk"
42 5) Select "Create DOS partition or Logical Drive"
44 6) Select "Create Primary DOS Partition"
46 7) Tell it how big to make it (I say use the whole drive.
47 It is pretty tiny after all.)
49 8) Get out of FDISK by hitting <ESC> a few times.
51 9) doscmd will now abort (will try and fix this in a future version)
53 10) start up doscmd again, leaving the floppy in the drive.
55 11) At the > prompt, type "format c:" and follow the instructions.
57 12) At the > prompt type "sys c:"
59 13) Get out of doscmd.
61 14) Either remove the floppy from the drive or add the line
67 15) You should now be running DOS off of your new disk. You will
68 probably want both config.sys and an autoexec.bat file. To
69 start with, you can say:
71 > copy con: config.sys
74 > copy con: autoexec.bat
82 17) You now have a bootable pseudo disk which will automatically call
83 the magic "redir" program, which installs FreeBSD disks. To use
84 them add lines to your .doscmdrc such as:
87 assign P: -ro /usr/prb
89 Note that you will not always be able to access every file due to
92 18) To use the new EMS memory you need to copy the file emsdriv.sys
93 to your DOS boot disk (disk image) in the same way you copied
94 redir.com. The use it in your "config.sys" from DOS:
96 where C: is your boot drive (supply the correct letter, if needed)
97 and emsdriv.sys is the driver. You could load it high. It should
98 report "Doscmd EMS 4.0 driver installed".