diff --git a/assets/DOSBOOT.tevd.original b/assets/DOSBOOT.tevd.original
index c1e54bd..cd387c3 100644
Binary files a/assets/DOSBOOT.tevd.original and b/assets/DOSBOOT.tevd.original differ
diff --git a/assets/disk0/!BOOTSEC b/assets/disk0/!BOOTSEC
index cc49c78..5e24980 100644
--- a/assets/disk0/!BOOTSEC
+++ b/assets/disk0/!BOOTSEC
@@ -1 +1 @@
-let p=_BIOS.FIRST_BOOTABLE_PORT;com.sendMessage(p[0],"DEVRST\x17");com.sendMessage(p[0],'OPENR"tvdos/TVDOS.SYS",'+p[1]);let r=com.getStatusCode(p[0]);if(0==r)if(com.sendMessage(p[0],"READ"),r=com.getStatusCode(p[0]),0==r){let g=com.pullMessage(p[0]);eval(g)}else println("I/O Error");else println("TVDOS.SYS not found");println("Shutting down...");println("It is now safe to turn off the power")
\ No newline at end of file
+let p=_BIOS.FIRST_BOOTABLE_PORT;com.sendMessage(p[0],"DEVRST\x17");com.sendMessage(p[0],'OPENR"tvdos/hyve.SYS",'+p[1]);let r=com.getStatusCode(p[0]);if(0==r)if(com.sendMessage(p[0],"READ"),r=com.getStatusCode(p[0]),0==r){let g=com.pullMessage(p[0]);eval(g)}else println("I/O Error");else println("TVDOS.SYS not found");println("Shutting down...");println("It is now safe to turn off the power")
\ No newline at end of file
diff --git a/assets/disk0/!BOOTSEC_old b/assets/disk0/!BOOTSEC_old
new file mode 100644
index 0000000..cc49c78
--- /dev/null
+++ b/assets/disk0/!BOOTSEC_old
@@ -0,0 +1 @@
+let p=_BIOS.FIRST_BOOTABLE_PORT;com.sendMessage(p[0],"DEVRST\x17");com.sendMessage(p[0],'OPENR"tvdos/TVDOS.SYS",'+p[1]);let r=com.getStatusCode(p[0]);if(0==r)if(com.sendMessage(p[0],"READ"),r=com.getStatusCode(p[0]),0==r){let g=com.pullMessage(p[0]);eval(g)}else println("I/O Error");else println("TVDOS.SYS not found");println("Shutting down...");println("It is now safe to turn off the power")
\ No newline at end of file
diff --git a/assets/disk0/tvdos/hyve.SYS b/assets/disk0/tvdos/hyve.SYS
new file mode 100644
index 0000000..011fdad
--- /dev/null
+++ b/assets/disk0/tvdos/hyve.SYS
@@ -0,0 +1,63 @@
+/*
+hyve is a hypervisor for tsvm.
+
+## hyve boot sequence
+
+0. bios starts up
+1. bootloader calls hyve.js
+2. hyve sets up itself, spawns new context which runs TVDOS.SYS
+3. hands the control over to the TVDOS until SysRq sequence is struck
+*/
+
+let context = parallel.spawnNewContext()
+let bios = `
+// probe bootable device
+
+var _BIOS = {};
+
+// Syntax: [Port, Drive-number]
+// Port #0-3: Serial port 1-4
+//      #4+ : Left for future extension
+// Drive-number always starts at 1
+_BIOS.FIRST_BOOTABLE_PORT = [0,1]; // ah screw it
+
+Object.freeze(_BIOS);
+
+///////////////////////////////////////////////////////////////////////////////
+
+// load a bootsector using 'LOADBOOT'
+let portNumber = 0;
+let driveStatus = 0;
+let guestExit = false;
+while (portNumber < 4) {
+    if (com.areYouThere(portNumber)) {
+        com.sendMessage(portNumber,"DEVRST\x17");
+        com.sendMessage(portNumber, 'OPENR"tvdos/TVDOS.SYS",'+_BIOS.FIRST_BOOTABLE_PORT[1]);
+        driveStatus = com.getStatusCode(portNumber);
+        if (driveStatus == 0) break;
+    }
+    portNumber += 1;
+}
+if (portNumber < 4) {
+    com.sendMessage(portNumber,"READ");
+    let r = com.getStatusCode(portNumber);
+    if (r == 0) {
+        let g = com.pullMessage(portNumber);
+        eval(g);
+    }
+    else {
+        println("I/O Error");
+    }
+}
+else {
+    printerrln("No bootable medium found.");
+}
+`
+let runner = parallel.attachProgram("TVDOS", context, bios)
+parallel.launch(runner)
+
+while (parallel.isRunning(runner)) {
+    sys.sleep(1000)
+}
+
+println(" LX4 cya!")
\ No newline at end of file
diff --git a/terranmon.txt b/terranmon.txt
index 3c849e3..20891ea 100644
--- a/terranmon.txt
+++ b/terranmon.txt
@@ -104,6 +104,8 @@ MMIO
 90 RO: BMS calculated battery percentage where 255 is 100%
 91 RO: BMS battery voltage multiplied by 10 (127 = "12.7 V")
 
+92..127 RW: Used by the hypervisor
+
 1024..2047 RW: Reserved for integrated peripherals (e.g. built-in status display)
 
 4076..4079 RW: 8-bit status code for the port
diff --git a/tsvm_core/src/net/torvald/tsvm/VMJSR223Delegate.kt b/tsvm_core/src/net/torvald/tsvm/VMJSR223Delegate.kt
index 72502ca..0e6a6ff 100644
--- a/tsvm_core/src/net/torvald/tsvm/VMJSR223Delegate.kt
+++ b/tsvm_core/src/net/torvald/tsvm/VMJSR223Delegate.kt
@@ -293,6 +293,7 @@ class Parallel(private val vm: VM) {
         thread.interrupt()
         vm.contexts.remove(thread)
     }
+    fun isRunning(thread: Thread) = thread.isAlive
     fun getThreadPool() = vm.contexts
 }
 
diff --git a/tsvm_core/src/net/torvald/tsvm/VMRunnerFactory.kt b/tsvm_core/src/net/torvald/tsvm/VMRunnerFactory.kt
index c12dc6e..2604c5c 100644
--- a/tsvm_core/src/net/torvald/tsvm/VMRunnerFactory.kt
+++ b/tsvm_core/src/net/torvald/tsvm/VMRunnerFactory.kt
@@ -54,7 +54,7 @@ object VMRunnerFactory {
             "js" -> {
                 object : VMRunner(extension) {
                     private val ringOneParallel = Parallel(vm)
-                    private val ringTwoParallel = ParallelDummy()
+                    private val ringTwoParallel = Parallel(vm)//ParallelDummy()
 
                     private val context = Context.newBuilder("js")
                         .allowHostAccess(HostAccess.ALL)