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Ms Dos 622 Img Files Works With Virtual Box Top ((install)) Guide

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Ms Dos 622 Img Files Works With Virtual Box Top ((install)) Guide

MS‑DOS 6.22 IMG files — compatibility with VirtualBox

Summary

Preparation

  1. Files needed
    • MS‑DOS 6.22 boot floppy image (e.g., disk 1 .img or .ima).
    • Optional: additional floppy images (disk 2, utilities), or a virtual hard disk (VDI) containing MS‑DOS installed.
  2. VirtualBox setup
    • Create a new VM:
      • Type: Other/Other (or Windows 95/98 if required)
      • Version: Other/Unknown (32‑bit)
      • RAM: 8–32 MB (MS‑DOS needs very little; 16 MB is safe).
      • Boot order: Floppy first (or attach image to IDE controller).
    • Storage:
      • Add a virtual floppy controller and attach the MS‑DOS .img/.ima file as the floppy.
      • Or create a small VDI (20–500 MB) and install MS‑DOS onto it by booting from the floppy image and running FORMAT/COPY/FDISK/SETUP.

Booting and installation

Drivers, networking, and limitations

Image conversion and alternatives

Troubleshooting

Recommendation

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Automating IMG Swapping

Write a simple batch file (SWAP.BAT):

@echo off
echo Insert disk 2 into virtual floppy drive.
pause
copy a:\*.* c:\install

This halts until you swap the IMG via the VirtualBox menu.

7.3 Sound and Games

SET BLASTER=A220 I7 D1 H5 T4

The Core Problem: VirtualBox’s Floppy Controller Quirks

VirtualBox does have a virtual floppy controller. You can attach .img files to it. However, there are two major pitfalls:

  1. No Direct Booting from IMG on New VMs: When you create a new VM, the boot order prioritizes the optical drive (CD/DVD) and hard disk. If you attach a DOS boot floppy .img to the floppy controller, VirtualBox often skips it unless you go into the VM’s system menu during boot and manually select the floppy drive.
  2. Size Limitations: VirtualBox can be finicky about non-standard .img sizes. Some old DOS disk images are 720k, 1.2MB (5.25-inch), or even weird copy-protected formats. Stick to 1.44MB (exactly 1,474,560 bytes) for the highest compatibility.

Advanced: Creating Your Own .IMG Files for VirtualBox

Sometimes you want to add custom software (like Turbo C, a game, or Norton Commander). You don’t need real floppies. On a modern PC, you can create .img files using:

Once you have a blank, formatted .img, attach it to your DOS VM as a second floppy drive? Wait – VirtualBox only emulates one floppy drive. So you must swap images. Better yet: after DOS is installed, use a network share (through VirtualBox’s "Shared Folders" – requires installing the Guest Additions, which don’t exist for DOS) or, more practically, create a virtual hard disk (VHD) as a secondary drive, format it as FAT16 on a modern PC, fill it with DOS software, and attach it to the VM. ms dos 622 img files works with virtual box top

4.2 Critical System Settings

After creating the VM, go to Settings > System:

What are IMG Files?

An .img file is a raw, sector-by-sector copy of a floppy disk (or hard drive). In the DOS era, installation came on (3) 1.44MB floppy disks:

When you download “MS-DOS 6.22” from abandonware archives, you often get three files: DISK1.IMG, DISK2.IMG, DISK3.IMG.