Any program that works on MS-DOS should also run on FreeDOS. Let’s try it with an example: installing a copy of the FreeDOS operating system. FreeDOS is an open source DOS-compatible operating system that you can use to run legacy business software and other DOS applications. Now that we have the essentials to start a virtual machine with QEMU, we can put it all together on a single command line to create and boot your virtual machine! For example, set -boot order=dc to tell QEMU to try the CDROM ( d ) first, then the hard drive ( c ). Use -boot to specify the order that QEMU should look for bootable devices. You can also append a suffix of M or G to specify the memory in MB or GB. If you do not explicitly set this, QEMU defaults to 128 MB. microvm also establishes a baseline for benchmarking and optimizing both QEMU and guest operating systems, since it is optimized for both boot time and footprint. Set the amount of memory in the virtual machine with the -m size option. It’s a minimalist machine type without PCI nor ACPI support, designed for short-lived guests. For example, this might be the bootable ISO image to install Linux, Windows, or another operating system. Set -cdrom isofile to define the CD-ROM or DVD image file. This should be the same virtual disk you defined with the qemu-img command. Use -hda imagefile to tell QEMU to use imagefile as the hard drive image. However, it installed qemu version 2.5.0 on Ubuntu 16.04, which is relatively old version. It will install both both user and system modes of qemu. To emulate a more modern system, use qemu-system-x86_64. One (easy, but not recommended) way to install qemu is to use package installation. To emulate a legacy PC system, use qemu-system-i386.
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