Qemu is a machine emulator (i.e. virtual machine), similar to VirtualBox and VMWare.

• change tty in the guest os running on qemu with ALT + left or right arrows

To get this (compatmonitor0: available in 'View' menu), hit CTRL+ALT+F2. It is also available on host terminal using -monitor stdio command-line option.

To switch tty terminal in guest OS, type

sendkey ctrl-alt-f2

To get information on block devices available, type

info block

To change virtual CD image, type

change <device> <file>

To create 15G disk image:

qemu-img create -f qcow2 disk.qcow2 15G

To convert from VBox disk image:

qemu-img convert -f vdi -O qcow2 disk.vdi disk.qcow2

To convert from raw disk image:

qemu-img convert -f raw -O qcow2 disk.img disk.qcow2

To convert to raw disk image:

qemu-img convert -f qcow2 -O raw disk.qcow2 disk.img

To get smaller disk image:

qemu-img convert -O qcow2 disk.qcow2 disk_small.qcow2

just dumping this here for now…

qemu-system-i386 -m 1536 -boot order=c,once=d -hda WinXP.qcow2 -cdrom winxp.iso

qemu-system-i386 -m 1536 -boot order=c -hda WinXP.qcow2

qemu-system-i386 -monitor stdio -enable-kvm -m 1536M WinXP.qcow2

to get pure vga (640x480) old games on windows xp?
-vga cirrus

default is
# -net nic -net user
nic: enables network card
user: sets up virtual subnet (dhcp: 10.0.2.15{guest} 10.0.2.2{host})

# -net nic -net user,hostname=my1VM
# -name "MY1 VM"

# -redir tcp:2222::22

qemu-system-i386 -soundhw help

qemu-system-i386 -soundhw sb16
qemu-system-i386 -soundhw all

3d graphics

-vga virtio -display sdl,gl=on
-vga virtio -display gtk,gl=on

qemu-system-i386 -m 1536 -boot order=c,once=d -hda Slack.img -cdrom slackware-14.1-install.iso