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v86
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<!doctype html>
<title>Two emulators</title>

<script src="../build/libv86.js"></script>
<script>
"use strict";

window.onload = function()
{
    var container1 = document.getElementById("screen_container1");
    var container2 = document.getElementById("screen_container2");

    var emulator1 = new V86({
        wasm_path: "../build/v86.wasm",
        screen_container: container1,
        bios: {
            url: "../bios/seabios.bin",
        },
        vga_bios: {
            url: "../bios/vgabios.bin",
        },
        cdrom: {
            url: "../images/linux4.iso",
        },
        autostart: true,
    });

    var emulator2 = new V86({
        wasm_path: "../build/v86.wasm",
        screen_container: container2,
        bios: {
            url: "../bios/seabios.bin",
        },
        vga_bios: {
            url: "../bios/vgabios.bin",
        },
        cdrom: {
            url: "../images/linux4.iso",
        },
        autostart: true,
    });

    emulator2.keyboard_set_status(false);

    container1.addEventListener("mousedown", function(e)
    {
        container1.style.borderColor = "yellow";
        container2.style.borderColor = "black";

        emulator1.keyboard_set_status(true);
        emulator2.keyboard_set_status(false);
    }, false);

    container2.addEventListener("mousedown", function(e)
    {
        container1.style.borderColor = "black";
        container2.style.borderColor = "yellow";

        emulator1.keyboard_set_status(false);
        emulator2.keyboard_set_status(true);
    }, false);

    emulator1.add_listener("serial0-output-byte", function(byte)
    {
        var char = String.fromCharCode(byte);
        emulator2.serial0_send(char);
    });
    emulator1.add_listener("net0-send", function(data)
    {
        emulator2.bus.send("net0-receive", data);
    });
    emulator2.add_listener("net0-send", function(data)
    {
        emulator1.bus.send("net0-receive", data);
    });
};
</script>

To set up networking:
<pre>
# first VM
ifconfig eth0 up arp 10.5.0.2

# second VM
ifconfig eth0 up arp 10.5.0.3
ping 10.5.0.2
</pre>
Click on a screen to control it.
<hr>

<div id="screen_container1" style="float: left; margin: 10px; border: 3px solid yellow;">
    <div style="white-space: pre; font: 14px monospace; line-height: 14px"></div>
    <canvas style="display: none"></canvas>
</div>

<div id="screen_container2" style="float: left; margin: 10px; border: 3px solid black;">
    <div style="white-space: pre; font: 14px monospace; line-height: 14px"></div>
    <canvas style="display: none"></canvas>
</div>