Now Install MS-DOS 7.10 and Dual-Boot with the installed Windows 7
Installing MS-DOS 7.10 on the previously prepared FAT32 Primary partition on the first hard disk does not make any changes to Windows 7 which will continue to boot normally - the NTFS drives are totally ignored.
If you don't have a floppy drive, download win98se_bootdisk.iso and use Windows 7 to create the MS-DOS 7.10 bootable CD (in Windows Explorer, right-click the win98se_bootdisk.iso file and select Burn disk image). It pretends it's a floppy!
- Bootup from a Win98SE boot floppy or from a Win98SE or MS-DOS 7.10 bootable CD/Flash drive.
- At the Prompt, type these commands and press Enter after each. Note the space before each /A.
DIR C: /A to prove C is the correct drive
SYS C: to create MS-DOS 7.10 boot sector and boot files for C:
DIR C: /A to show the new boot files on C:
- sys c: creates a DOS boot sector for the doos partition and installs a very basic MS-DOS 7.10.
- Remove the floppy or CD/Flash drive.
- Restart computer (CTRL-ALT-Del). Windows 7 will bootup normally (the Active flag has not been moved).
Next use EasyBCD to add the MS-DOS 7.10 boot option to the Windows 7 boot loader menu.
- With Windows 7 booted,
Install/Run EasyBCD (click Yes for "User Account Control").
Restart computer. See if MS-DOS 7.10 will boot from the boot menu.
- Select Add New Entry in the left pane.
- Select the Windows tab in the upper right pane.
- In Type drop-down, select Windows 95/98/ME (not MS-DOS 6.x).
- In Name, rename "Microsoft Windows 9x" to MS-DOS 710.
- In Drive, you'll see it is "Automatically configured". That's correct.
- Click the Add Entry button in the same pane.
- Optional: You can now modify the timeout of the boot loader menu
- click the Edit Boot Menu (left pane) and set the Boot default OS after to about 5 seconds.
Optional: You can also change the OS to boot by default. Click Save settings when finished.
- Exit EasyBCD.
- Skip this part if MS-DOS 7.10 does start from the boot menu.
If DOS does not boot, you should copy MS-DOS boot files to the Active drive.
- In Win8, press Win+X keys > Disk Management and identify the Active drive on the correct hard disk.
If this Active drive has no drive letter, then add one (right-click the drive > Change drive letters and ... > Add)
- In Windows Explorer, make hidden files and folders on your computer visible to you (read how).
- Copy Io.sys from root of the DOS drive to root of the Active drive.
- Remove that new drive letter now if you added one. Also undo the 'hidden' changes you made.
Note: An alternative method is to use EasyBCD to copy the Windows 7 boot files and Boot folder to the DOS drive and then make the DOS drive the Active boot drive (click BCD Backup/Repair, select Change boot drive and click Perform Action, select the drive letter currently allocated to the doos drive, click OK).
Restart computer. Both Windows 7 and MS-DOS 7.10 should now boot from the boot loader menu.
- Add the rest of the MS-DOS 7.10 files at your leisure using the same file versions.
Add/Edit Config.sys, Autoexec.bat, and perhaps Msdos.sys, to suit your own requirements.
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