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 $ */
3 /* $DragonFly: src/usr.bin/doscmd/README.booting_dos,v 1.2 2003/06/17 04:29:25 dillon Exp $ */
5 To install DOS on a pseudo hard disk under doscmd:
7 1) Create a .doscmdrc with at least the following:
9 assign A: /dev/fd0.1440 1440
10 assign A: /dev/fd0.720 720
11 assign hard boot_drive 80 2 2
13 You may need to adjust the raw files for the A: drive to match
14 your system. This example will cause the HD drive to be tried
15 first and the DD drive second.
17 Note that you should only use raw devices or files at this point,
18 do not use a cooked device! (Well, it would probably be okay
19 for a hard disk, but certainly not the floppy)
21 boot_drive should be the file name of where you want your bootable
22 image to be. The three numbers which follow "80 2 2" say that the
23 drive will have 80 cylinders, 2 heads and 2 sectors per track.
24 This is the smallest drive possible which still can have MS DOS
25 5.0 installed on it along with a config.sys and autoexec.bat file.
27 You might want to create a larger boot drive.
29 The file boot_drive must exist, so use the command touch to create
32 2) Insert a floppy disk into the A: drive which is bootable to MS-DOS
33 and has the commands fdisk, format and sys on it. You should also
34 copy the file redir.com onto the floppy by either mounting it
35 with the msdos file system type or by using mtools.
37 (i.e. mwrite redir.com a:)
41 4) At the > prompt type "fdisk"
43 5) Select "Create DOS partition or Logical Drive"
45 6) Select "Create Primary DOS Partition"
47 7) Tell it how big to make it (I say use the whole drive.
48 It is pretty tiny after all.)
50 8) Get out of FDISK by hitting <ESC> a few times.
52 9) doscmd will now abort (will try and fix this in a future version)
54 10) start up doscmd again, leaving the floppy in the drive.
56 11) At the > prompt, type "format c:" and follow the instructions.
58 12) At the > prompt type "sys c:"
60 13) Get out of doscmd.
62 14) Either remove the floppy from the drive or add the line
68 15) You should now be running DOS off of your new disk. You will
69 probably want both config.sys and an autoexec.bat file. To
70 start with, you can say:
72 > copy con: config.sys
75 > copy con: autoexec.bat
83 17) You now have a bootable pseudo disk which will automatically call
84 the magic "redir" program, which installs FreeBSD disks. To use
85 them add lines to your .doscmdrc such as:
88 assign P: -ro /usr/prb
90 Note that you will not always be able to access every file due to
93 18) To use the new EMS memory you need to copy the file emsdriv.sys
94 to your DOS boot disk (disk image) in the same way you copied
95 redir.com. The use it in your "config.sys" from DOS:
97 where C: is your boot drive (supply the correct letter, if needed)
98 and emsdriv.sys is the driver. You could load it high. It should
99 report "Doscmd EMS 4.0 driver installed".