diff --git a/ESP32/main.ino b/ESP32/main.ino
index 27a0e51..1c60cc3 100644
--- a/ESP32/main.ino
+++ b/ESP32/main.ino
@@ -230,6 +230,7 @@ void start_network(console *const c)
 		}
 
 		dc11 *dc11_ = new dc11(b, comm_interfaces);
+		dc11_->begin();
 		b->add_DC11(dc11_);
 
 		cs->println("* Starting (NTP-) clock");
diff --git a/comm_tcp_socket_server.cpp b/comm_tcp_socket_server.cpp
index 57e2e73..c66057f 100644
--- a/comm_tcp_socket_server.cpp
+++ b/comm_tcp_socket_server.cpp
@@ -224,13 +224,18 @@ void comm_tcp_socket_server::operator()()
 
 		cfd = accept(fd, nullptr, nullptr);
 
+		if (cfd != INVALID_SOCKET) {
+			set_nodelay(cfd);
+
+			DOLOG(info, false, "Connected with %s", get_endpoint_name(cfd).c_str());
+		}
+
+#if 0
 		if (setup_telnet_session(cfd) == false) {
 			close(cfd);
 			cfd = INVALID_SOCKET;
 		}
-
-		if (cfd != INVALID_SOCKET)
-			set_nodelay(cfd);
+#endif
 	}
 
 	DOLOG(info, true, "comm_tcp_socket_server thread terminating");
diff --git a/dc11.cpp b/dc11.cpp
index 0e2ef96..4b13034 100644
--- a/dc11.cpp
+++ b/dc11.cpp
@@ -31,10 +31,7 @@ dc11::dc11(bus *const b, const std::vector<comm *> & comm_interfaces):
 	b(b),
 	comm_interfaces(comm_interfaces)
 {
-	connected.resize(comm_interfaces.size());
-
-	// TODO move to begin()
-	th = new std::thread(std::ref(*this));
+	connected.resize(4);  // FIXME keep same size as comm_interfaces
 }
 
 dc11::~dc11()
@@ -78,6 +75,13 @@ void dc11::show_state(console *const cnsl) const
 	}
 }
 
+bool dc11::begin()
+{
+	th = new std::thread(std::ref(*this));
+
+	return true;
+}
+
 void dc11::test_port(const size_t nr, const std::string & txt) const
 {
 	DOLOG(info, false, "DC11 test line %zu", nr);
@@ -115,6 +119,7 @@ void dc11::operator()()
 
 			if (is_connected != connected[line_nr]) {
 				DOLOG(debug, false, "DC11 line %d state changed to %d", line_nr, is_connected);
+				Serial.printf("DC11 line %d state changed to %d\r\n", line_nr, is_connected);
 
 				connected[line_nr] = is_connected;
 
@@ -306,6 +311,7 @@ dc11 *dc11::deserialize(const JsonVariantConst j, bus *const b)
 		interfaces.push_back(comm::deserialize(v, b));
 
 	dc11 *r = new dc11(b, interfaces);
+	r->begin();
 
 	for(int regnr=0; regnr<4; regnr++)
 		r->registers[regnr] = j[format("register-%d", regnr)];
diff --git a/dc11.h b/dc11.h
index 96563d9..63d9e8f 100644
--- a/dc11.h
+++ b/dc11.h
@@ -46,6 +46,8 @@ class dc11: public device
 	dc11(bus *const b, const std::vector<comm *> & comm_interfaces);
 	virtual ~dc11();
 
+	bool begin();
+
 	JsonDocument serialize() const;
 	static dc11 *deserialize(const JsonVariantConst j, bus *const b);
 
diff --git a/dc11.json b/dc11.json
new file mode 100644
index 0000000..7ff93e4
--- /dev/null
+++ b/dc11.json
@@ -0,0 +1,25 @@
+{
+  "interfaces": [
+    {
+      "comm-backend-type": "tcp-server",
+      "port": 1100
+    },
+    {
+      "comm-backend-type": "tcp-server",
+      "port": 1101
+    },
+    {
+      "comm-backend-type": "tcp-server",
+      "port": 1102
+    },
+    {
+      "comm-backend-type": "posix",
+      "device": "/tmp/virtualcom0",
+      "bitrate": 38400
+    }
+  ],
+  "register-0": 0,
+  "register-1": 0,
+  "register-2": 0,
+  "register-3": 0
+}
\ No newline at end of file
diff --git a/main.cpp b/main.cpp
index e708dcc..fba632a 100644
--- a/main.cpp
+++ b/main.cpp
@@ -609,6 +609,7 @@ int main(int argc, char *argv[])
 	}
 
 	dc11 *dc11_ = new dc11(b, comm_interfaces);
+	dc11_->begin();
 	b->add_DC11(dc11_);
 	//
 
diff --git a/work/werkend-mu/base/unix_v7m_rl0.dsk.xz b/work/werkend-mu/base/unix_v7m_rl0.dsk.xz
new file mode 100644
index 0000000..f45c5c0
Binary files /dev/null and b/work/werkend-mu/base/unix_v7m_rl0.dsk.xz differ
diff --git a/work/werkend-mu/base/unix_v7m_rl1.dsk.xz b/work/werkend-mu/base/unix_v7m_rl1.dsk.xz
new file mode 100644
index 0000000..986da51
Binary files /dev/null and b/work/werkend-mu/base/unix_v7m_rl1.dsk.xz differ
diff --git a/work/werkend-mu/run-term.sh b/work/werkend-mu/run-term.sh
new file mode 100755
index 0000000..3c59356
--- /dev/null
+++ b/work/werkend-mu/run-term.sh
@@ -0,0 +1,12 @@
+#! /bin/sh
+
+echo boot
+echo 'rl(0,0)munix'
+
+rm ~/temp/ramdisk/test2.log
+
+RS=128
+
+echo 'socat TCP-LISTEN:2334,reuseaddr pty,link=/tmp/virtualcom0,raw'
+
+./build/kek -r work/werkend-mu/unix_v7m_rl0.dsk -r work/werkend-mu/unix_v7m_rl1.dsk -b -S $RS -L info,debug -l ~/temp/ramdisk/test2.log -P -1 /tmp/virtualcom0 -d  # -t
diff --git a/work/werkend-mu/run.sh b/work/werkend-mu/run.sh
new file mode 100755
index 0000000..b7d758c
--- /dev/null
+++ b/work/werkend-mu/run.sh
@@ -0,0 +1,14 @@
+#! /bin/sh
+
+echo boot
+echo 'rl(0,0)unix'
+
+rm ~/temp/ramdisk/test2.log
+
+if [ "$1" = "fast" ] ; then
+./build/kek -r work/werkend-mu/unix_v7m_rl0.dsk -r work/werkend-mu/unix_v7m_rl1.dsk -b -S 256 -L error,info -l ~/temp/ramdisk/test2.log -P
+elif [ "$1" = "medium" ] ; then
+./build/kek -r work/werkend-mu/unix_v7m_rl0.dsk -r work/werkend-mu/unix_v7m_rl1.dsk -b -L error,info -l ~/temp/ramdisk/test2.log -d -S 256 -P
+else
+./build/kek -r work/werkend-mu/unix_v7m_rl0.dsk -r work/werkend-mu/unix_v7m_rl1.dsk -b -L error,debug -l ~/temp/ramdisk/test2.log -d -t -X -S 256 -P
+fi
diff --git a/work/werkend-mu/unix_v7m_rl0.dsk b/work/werkend-mu/unix_v7m_rl0.dsk
new file mode 100644
index 0000000..c36ce36
Binary files /dev/null and b/work/werkend-mu/unix_v7m_rl0.dsk differ
diff --git a/work/werkend-mu/unix_v7m_rl0.dsk.xz b/work/werkend-mu/unix_v7m_rl0.dsk.xz
new file mode 100644
index 0000000..705f32e
Binary files /dev/null and b/work/werkend-mu/unix_v7m_rl0.dsk.xz differ
diff --git a/work/werkend-mu/unix_v7m_rl1.dsk b/work/werkend-mu/unix_v7m_rl1.dsk
new file mode 100644
index 0000000..05f0d51
Binary files /dev/null and b/work/werkend-mu/unix_v7m_rl1.dsk differ
diff --git a/work/werkend-mu/unix_v7m_rl1.dsk.xz b/work/werkend-mu/unix_v7m_rl1.dsk.xz
new file mode 100644
index 0000000..986da51
Binary files /dev/null and b/work/werkend-mu/unix_v7m_rl1.dsk.xz differ
diff --git a/work/werkend-mu/unpack-replace.sh b/work/werkend-mu/unpack-replace.sh
new file mode 100755
index 0000000..b9c02ec
--- /dev/null
+++ b/work/werkend-mu/unpack-replace.sh
@@ -0,0 +1,6 @@
+#! /bin/sh
+
+cd /home/folkert/Projects/PDP-11/work/werkend-mu
+
+xzcat unix_v7m_rl0.dsk.xz > unix_v7m_rl0.dsk
+xzcat unix_v7m_rl1.dsk.xz > unix_v7m_rl1.dsk