Frequently Asked Questions

How can I upload a file to the virtual machine ?

Click on the up arrow below the terminal. The file(s) will be copied to your home directory.

Note: file upload only works in the Linux VMs.

How can I export a file from the virtual machine ?

Use the export_file filename shell command.

Note: file export only works in the Linux VMs.

How can I copy and paste data to the web terminal ?

To copy data, just select it with the mouse and use the "Copy" contextual menu (right click). To paste data, right click on the terminal cursor to show the contextual menu and select "Paste". Alternatively, you can use the "Paste" command in the navigator global menu.

Note: copy/paste of files is not supported. Copy/paste is only supported in the console Linux VMs.

How can I use the web terminal on a mobile device ?

Touch the terminal window to show the virtual keyboard. In order to use control keys, you may have to install a specific virtual keyboard (such as Hacker's Keyboard on Android).

Can I access to the network from the virtual machine ?

Yes it is possible. It uses the websocket VPN offered by Benjamin Burns (see his blog). The bandwidth is capped to 40 kB/s and at most two connections are allowed per public IP address. Please don't abuse the service.

Can I run the virtual machines with TinyEMU ?

Yes. Use the VM Config URL provided in the Virtual Machine list. Then use it as configuration file for the standalone emulator, e.g.:

    temu https://bellard.org/jslinux/buildroot-x86-xwin.cfg

    temu https://bellard.org/jslinux/buildroot-riscv64-xwin.cfg

Can I change the amount of RAM of the web virtual machine ? Can I change the size of the terminal ?

Yes. There are many options that can be selected just by adding parameters to the URL. For example:
https://bellard.org/jslinux/vm.html?cpu=x86&url=buildroot-x86.cfg&mem=128&cmdline=TEST%3d1

url sets the virtual machine filesystem URL
mem sets the memory size in MB
cpu selects the cpu type: x86, riscv64 or riscv32 (default = x86)
cols number of columns of the terminal (default = 80)
rows number of lines of the terminal (default = 30)
font_size font size in pixels (default = 15)
graphic 0=terminal GUI, 1=frame buffer GUI (default = 0)
w width in pixels of the frame buffer (only meaningful with graphic=1)
h height in pixels of the frame buffer (only meaningful with graphic=1)
cmdline adds parameters to the kernel command line (you can get them as environment variables if the kernel does not use them). Use the URL escape %3d for the "=" character. The following variables are recognized by the VM init script:
- KBMAP set the default keyboard mapping in X window or in the Linux frame buffer console (.e.g fr, us, de, ...).
net_url sets the URL of the websocket VPN. An empty value disables network access. A default VPN URL is set if the option is not present.

How to set the keyboard mapping in the X11 GUI ?

Use the menu available with the mouse right click. If your country is not listed, you can try to type the command:

setxkbmap
  -layout x

where x is the country code of your keyboard mapping.

If your keyboard is still not working correctly, it means your browser does not return the PC hardware keycodes needed to emulate a PC keyboard. You can still use the virtual keyboard (available in the right click menu).

How to set the keyboard mapping in the Windows 2000 demo ?

Right click on the EN icon near the clock (bottom right of the screen), select properties, add the wanted keyboard and select it.

If your keyboard is still not working correctly, it means your browser does not return the PC hardware keycodes needed to emulate a PC keyboard.

Alternatively, you can use the on-screen-keyboard (its icon is on the desktop).

Why is the [Alt] key not working as expected in Firefox ?

In older Firefox versions the [Alt] key is always intercepted by the browser to display the menu. Upgrade to a more recent Firefox version to have the problem fixed.

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